Other results (O)

Name

Authors

Annotation

Methodology of brake testing according to ETSO C26c (2019)

Marek Boukal 
Václav Horák

In 2019, sub-assemblies and functional units were tested to verify the suitability of different material combinations of the friction pair for the achievement of the necessary forces, moments and temperatures, braking moments and other parameters during the braking cycle. For this purpose, the methodology used for testing in VZLU was developed. Protocol P-PK-0092/18 / ZK: Verification of the basic characteristics of the brake was taken from the tests.

This project result was developed within the FV30270 "Development of wheels and brakes for landing gears of small and medium-sized aircraft" with financial support from Ministry of Industry and Trade.

Analysis of heat transfer in the wheel-brake system (2019)

Radek Doubrava 
Jakub Šedek

The procedure for creation and analysis of numerical model of wheel and brake assembly was created. The result is documented in report R-7182 Design of FEM models for the analysis of heat conduction from the wheel brake.

This project result was developed within the FV30270 "Development of wheels and brakes for landing gears of small and medium-sized aircraft" with financial support from Ministry of Industry and Trade.

Methodology of wheel tests (2019)

Marek Boukal 
Václav Horák

The deliverable consists of the following methodological protocols: Protocol No.: P-PK-0085/18 / ZK: Test of radial strength of nose and main wheel Report No. : P-PK-0089/18 / ZK: Test for combined nose and main wheel load Protocol No.: P-PK-0084/18 / ZK: Moving test of nose and main wheel.

This project result was developed within the FV30270 "Development of wheels and brakes for landing gears of small and medium-sized aircraft" with financial support from Ministry of Industry and Trade.

Methodology of creating simulation models for evaluation of aerodynamic effects of vehicles (2019)

Nikola Žižkovský

Deliverable No. TE01020038-V226. The methodology defines the procedures for numerical simulations in the calculation of the pressure peaks induced by the passage of a train, which specify the requirements for the models given in EN 14067-4, resp. its Czech national version ČSN EN 14067-4. Compared to the standard, the methodology provides a broader description and explanatory comments on the requirements for geometry creation, computer network or computational model definition. Furthermore, the methodology indicates limits and effects of individual parameters in comparison with normative requirements so that it is possible to reduce the complexity of calculations during preliminary calculations, mainly used in the development phase of vehicles. Documented in report R-7044.

This project result was developed within the TE01020038 project "Competence Centre for Rail Vehicles"  with financial support from TA CR.

Protocol of static strength tests of the L-39NG airframe in the floating configuration (2019)

David Novotný

Test protocol No. P-PK-0078/19/ZK is part of the TH02010670-V13 result. The submitted document describes the procedure of the L-39 NG airframe static certification test performance in floating configuration, including the measured data enumeration.

This project result was developed within the TH02010670 project "Development of airframe for the L-39NG next generation aircraft" with financial support from TA ČR.

Strength tests of the L-39NG airframe in the floating configuration (2019)

David Novotný

The R-7076-V1 report is part of TH02010670-V4 and includes the brief description of the L-39NG airframe static strength tests performance.

This project result was developed within the TH02010670 project "Development of airframe for the L-39NG next generation aircraft" with financial support from TA ČR.

Database of results of atmospheric flow simulations over the surface of the Czech Republic (2019)

Martin Kyncl

The R-7133 report presents results of numerical calculations of atmospheric flow over the surface of the Czech Republic. It is a numerical solution of turbulent viscous compressible flow in a gravitational field with given surface roughness. The simulation results are stored in the database described in this report.

This project result was developed within the institutional support of the Ministry of Industry and Trade of the CR directed to the development of research organizations.

Numerical simulation of atmospheric flow in selected localities (2019)

Martin Kyncl

The R-7134 report presents results of numerical calculations of atmospheric flow over the surface of the Czech Republic. The report describes the procedure for simulating the flow around the given coordinates. It is a numerical solution of turbulent viscous compressible flow in a gravitational field with given surface roughness.

This project result was developed within the institutional support of the Ministry of Industry and Trade of the CR directed to the development of research organizations.

Introduction to calculation of whirl flutter in case of rotor with two-blade propellers (2019)

Jiří Čečrdle

The R-7080 report deals with the calculation of a whirl flutter for a specific case of a rotor with a two-blade propeller. The report summarizes the theoretical background of the issue of this specific case compared to the conventional case of a rotor with a rotationally symmetrical propeller, ie. with three or more blades.

This project result was developed within the institutional support of the Ministry of Industry and Trade of the CR directed to the development of research organizations.

Optimization of air nozzles (2019)

Armand Drábek 
Nikola Žižkovský

The R-7144 report describes how to optimize the nozzle flow and set the model for calculation. The computational optimization of the air diffusers led to the shape with rounded edge between the diffuser neck and the conical part in both considered cases. This change resulted in suppression of edge tear. Another change was in both cases the replacement of the cylindrical neck by a gradual widening in the direction from the aforementioned rounding and subsequent sharp reduction to the desired diameter of the diffuser.

This project result was developed within the institutional support of the Ministry of Industry and Trade of the CR directed to the development of research organizations.

Complementary CFD analyzes of blowing on the wing with strut (2019)

Vítězslav Hanzal

The report R-7131 describes a set of additional CFD calculations following the previous work described in Report R- 6974. The solution was to blow into the wing and strut connection area, where the blowing nozzle was placed on the wing. Possibility of pulse blowing was also investigated and simplified slot modeling was verified.

This project result was developed within the institutional support of the Ministry of Industry and Trade of the CR directed to the development of research organizations.

New Microaccelerometer sensor design (2019)

Vladimír Dániel

Microaccelerometer was developed for satellite non-gravitational acceleration measurements. It is designed in one block internally divided to the sensor part and electronic part. Both parts are interconnected by the rigid PCB bus, which carries also external communication and testing connectors. Documented in R-7122 report.

This project result was developed within the institutional support of the Ministry of Industry and Trade of the CR directed to the development of research organizations.

The development of reactoplast matrix with hydrophobic properties - situation report (2019)

Marta Čileková

The report R-7113 describes the basic experimental works during the development of reactoplast matrix with the hydrophobic properties for composite materials. The report includes a basic review of the state of the art. On the basis of of the review the main objectives were defined. There were two main posibilities how to obtain a matrix with hydrophobic properties - the hydrofobization of the whole volume and therefore the development of the new material or the use of the hydrophobic surface coating.

This project result was developed within the institutional support of the Ministry of Industry and Trade of the CR directed to the development of research organizations.

VZLU two-stage turbine - design, technology, assembly (2019)

Tomáš Jelínek 
Martin Němec

The R-7163 report introduces the construction of a newly built two-stage turbine. The reasons leading to the chosen solutions are described, the most important elements in the construction in terms of design, assembly and production technology are summarized. The assembly procedure is described for the entire assembly. The introduction summarizes the various aspects of the proposal that have influenced the final proposed option.

This project result was developed within the institutional support of the Ministry of Industry and Trade of the CR directed to the development of research organizations.

Application of piezoelectric transducers and resistance strain gauges for SHM of a metallic integral stiffened airframe panel (2019)

Pavel Kucharský 
Roman Růžek 

Presented on 9th European Workshop on Structural Health Monitoring (EWSHM 2018), July 10-13, 2018 in Manchester, UK (EWSHM 2018). The paper summarizes the structural health monitoring (SHM) methodology on the metallic integral airframe panel structure loaded by flight-by-flight type of sequence. The experiment and sensor network is described. The results based on the experimental data and SHM evaluation based on piezoelectric transducers (PZT) and resistance strain gauges (SG) are discussed. Data analysis and the subsequent evaluation of the structural health are based on continuously structure monitoring by PZT and SG sensors together with visual monitoring of the fatigue crack propagation using digital cameras. 

This project result was developed within the institutional support of the Ministry of Industry and Trade of the CR directed to the development of research organizations.

Numerical simulation of fuel spraying into an industrial object (2019)

Vojtěch Běták

Paper on conference EFM19 - Experimental Fluid Mechanics, Františkovy Lázně 19.11.2019. Numerical simulation of fuel spraying into industrial objects is described in this paper. This spatter may be caused by a vehicle or storage tank accident. Prediction of fuel spill is the main aim of simulations that allow predicting possible sources of secondary fires. Numerical simulations are based on the solution of the system of Navier-Stokes equations complemented by the solution of Lagrangian spray cloud and thin fluid film. The simulation results will help to identify better fire prevention and other preventive measures to minimize fire damage.

This project result was developed within the VI20172020092 project "Simulation of fire and smoke spreading inside cricital infrastructure caused by accident or intentional aircraft attack" with financial support from Ministry of Interior of the ČR.

Pre-treatment and testing of electrodes for cataphoretic painting (2019)

Martina Pazderová

The research was focused on the surface treatment of electrodes used in the drum for mass KTL painting. The aim of the surface treatment was to increase the lifetime and avoid surface passivation, which leads to a loss of electrode functionality. UED varnish proved to be optimal and a suitable method of application with subsequent verification of properties was found both in laboratory conditions and in the pilot plant in Megatec. Documented in R-7156 report.

This project result was developed within the TH02020019 project "Development of new technology for mass coating using electrophoretic systems" with financial support from TA ČR.

Influence of UV radiation on paint system resistance (2019)

Martina Pazderová 
Kateřina Titěrová

The work dealt with tests of coating systems designed for surface protection of steel structures. The resistance of the coating system was verified by means of a UV test. The evaluation was performed by visual evaluation of the surface, measurement of adhesion, change of gloss and color shade. Documented in R-7157 report.

This project result was developed within the TE02000011 project "Research Center of surface treatment"  with financial support from TA CR.

Comparison of corrosion resistance of coatings intended for protection of compressors (2019)

Michal Havlík 
Kateřina Titěrová

The work dealt with tests of coating systems intended for surface protection of compressors working at high temperatures and pressures. A testing methodology was designed to simulate the environment. The tests were carried out in an autoclave and the resistance of the coatings to liquid was monitored by the absorbent material. Documented in R-7158 report.

This project result was developed within the TE02000011 project "Research Center of surface treatment"  with financial support from TA CR.

Verification of corrosion resistance of paint systems designed for extreme climatic conditions (2019)

Michal Havlík 
Kateřina Titěrová

The work dealt with verification tests of paint systems designed for surface protection of aircraft structures under the influence of extreme climatic conditions. The basic condition was to maintain excellent adhesion of the paint system to the substrate under the influence of high humidity, UV radiation, high concentration of salts and other aggressive substances. Methodology simulating the given environment was designed and the properties were tested and a functional sample was designed. Documented in R-7159 report.

This project result was developed within the TE02000011 project "Research Center of surface treatment"  with financial support from TA CR.

Comparison of efficiency of paint removers (2019)

Michal Havlík 
Kateřina Titěrová

The work dealt with the comparison of the effectiveness of two types of paint removers, which were selected on the basis of laboratory tests. Verification was performed on matured samples according to the methodology agreed with the manufacturer. Both the time and effort required to completely remove the coating from the substrate were evaluated. The removers tested were designed to meet the latest environmental requirements while not damaging the base material. Documented in R-7136 report.

This project result was developed within the TE02000011 project "Research Center of surface treatment"  with financial support from TA CR.

Manual for NDT inspection of L39NG composite air duct (2019)

Petr Bělský 
Michal Podstawka

Some R&D activities were focused on non-destructive testing issues. The activities focused on the design and verification of NDT inspection procedures for the developed L39NG composite air duct. The structure of the air duct has been divided into several areas-groups marked by letters A to E, for which suitable NDT methods have been selected. Subsequently, the appropriate reference standards for flaw detectors setting were designed and manufactured. Various conventional and unconventional ultrasonic techniques were tested during the development activities. The possibilities of using laser shearography, pulse thermography and eddy current methods for NDT inspections of composite structures were also tested. Finally visual and manual ultrasonic methods were chosen as the main methods for NDT inspections of the air duct structure. This more conservative approach was chosen taking into account the current NDT equipment used by most L39 aircraft operators in daily practice. During the project the possibilities of automation of the NDT inspections of the L39 air duct by cobots were examined in accordance the latest trend “Industry 4.0”, which at the present affects practically all human activities. The resulting document can be used as a base for creation the final NDT manual of L39NG air duct. Documented in R-7070 report.

This project result was developed within the TE0200032 project "Research Centre for Advanced Aerostructures"  with financial support from TA CR.

Hybrid structures interface 3D printing - fiber composite (2019)

František Martaus

R-7088 report presents photomicrographs of the interface between a 3D printed structure (FDM printing method, polylactic acid) and a fiber composite (glass / epoxy). The interfaces between the two materials, respectively. a different degree of penetration of the epoxy binder into the print structure is observed.

This project result was developed within the institutional support of the Ministry of Industry and Trade of the CR directed to the development of research organizations.

Mechanical properties of AM / composite hybrid structures (2019)

Michal Král 
František Martaus

The report R-7087 documents shear strength tests of hybrid joints consisting of a printed thermoplastic (FDM method) and a carbon-epoxy composite using the Double Lap Shear (ASTM D3528) and Single Lap Shear (ASTM D1002) test methods. The adherend material on the thermoplastics side was a polyamide filled with ground carbon fibers, with a printed fill density of 20%, respectively. 100%. On the adherend side of the fiber composite, a carbon cloth of an infusion saturated with a low viscosity epoxy was used. Adherendic bonding was accomplished in two ways: a) a low viscosity epoxy binder infused the composite "in situ" directly on the thermoplastic adherend, and b) gluing the adherendes with a structural epoxy adhesive. The surface treatment of the printed adherents before gluing was performed by the action of low temperature atmospheric plasma.

This project result was developed within the institutional support of the Ministry of Industry and Trade of the CR directed to the development of research organizations.

Full-Scale Fatigue Test of Empennage of L 410 NG Aircraft (2019)

Vladimír Snop

New manufacturing technology and materials application have been applied in the framework of a new generation of commuter aircraft development. ¨These new technologies insure Damage Tolerance requirements. This report documents project demonstrator fatigue test - the empennage and fuselage rear part of the L410NG aircraft. The fatigue test has been conducted in the test laboratory of Strength of Structures Department VZLU. The result is documented in report R-7090.

This project result was developed within the TE0200032 project "Research Centre for Advanced Aerostructures"  with financial support from TA CR.

Damage detection ability in composite flat plate with constant and vaiable thickness using UGW (2019)

Šedková Lenka 
Roman Růžek

Reports evaluates the ability of defect detection by using of SHM methods based on ultrasonic guided waves (UGW) in flat composite plates with constant and variable thicknesses. The methodology, data measurements and evaluation of experimental work are described. The most optimal frequency for damage detection was selected. Documented in R-7164 report.

This project result was developed within the FV30033 "Design and manufacturing process development of primary aircraft parts of advanced shapes of reinforced thermoplastics" financed by MPO.

Test program qualification requirements (2019)

Roman Růžek

Report defines overview and summary of airworthiness and standards requirements to certification of aerospace parts manufactured by additive manufacturing process (3D printing). Report is the base for experimental certification of selected part on airframe structure including material and technological procedure. Documented in R-7069 report.

This project result was developed within the TN01000029 project "National Competence Centre for Aeronautics and Space"  with financial support from TA CR.

3D print coupon testing specification (2019)

Roman Růžek

Report defines the test matrix for certification of selected airframe part (the air bracket attachement) in compliance with airworthines regulations. Documented in R-7118 report.

This project result was developed within the TN01000029 project "National Competence Centre for Aeronautics and Space"  with financial support from TA CR.

Fatigue test of specimens (2019)

Roman Růžek

The aim of presented work is summarization and evaluation work which had been performed during solution of WP2 TE02000032 project in the field of Damage Tolerance behaviour of materials and structures. Report summarizes the main results and conclusions. The results are utilized in the framework of materials and joints lifetime evaluation of the L-410 airframe series. The main target was to obtain data for fatigue life extension of selected critical areas of L-410/L420 commuter aircraft manufacturing program. Documented in R-7148 report.

This project result was developed within the TE0200032 project "Research Centre for Advanced Aerostructures"  with financial support from TA CR.

Experimental verification of mechanical behaviour of selected structural parts of the airplane door (2019)

Radek Doubrava 
Martin Kadlec 
Pavel Kucharský 
Ivan Mlch 
Roman Růžek 

Report documents work associated with strength characteristics definition of selected structural parts of the airplane door - join of the Z profile and joint of the Omega profile with the Z profile, resp. with the fitting. Report is the base for final design and optimization of the door vertical frame manufactured from reinforced thermoplastic composite. Documented in R-7162 report.

This project result was developed within the FV30033 "Design and manufacturing process development of primary aircraft parts of advanced shapes of reinforced thermoplastics" financed by MPO.

Acoustic fatigue tests of composite structures with computational support in the ABAQUS software (2019)

Jiří Běhal

The operating loads of the inlet air duct of the airplane include, in the category of environmental loads, also the acoustic loads. The airworthiness codes allow a verification of the structural behavior by experimental means at achievable load levels and extrapolate its behavior to operational levels. Testing devices designed in the frame of the solved project use the acoustic loads in the form of planar acoustic wave and allow construct a FE models with high credibility. The paper presents approaches to the solution using the acoustic fatigue tests on the model samples and on the real structure. Experimental data are then extrapolated on the operational level by the FE simulations in the ABAQUS program. Following the “no growth” concept recommended in Appendix AMC 20-29 to the airworthiness code CS-23, the performed tests have shown that manufacturing defects of the prescribed size did not propagated over allowed limits.

This project result was developed within the TE0200032 project "Research Centre for Advanced Aerostructures"  with financial support from TA CR.

Mechanical joints of composites with a thermoplastic matrix (2019)

Roman Růžek 
Pavel Zděnek

Paper is focused on mechanical joining and theirs differences in metallic and composite materials. Paper deals with different types of bolts. Based on stress analysis several type of composite failure are taking into account. Methodology of strength measurement and evaluation of bearing strength is described. Several experimental results are summarized and discussed. Verification of mechanical joint with the same configuration as was supposed in numerical analysis is illustrated.

This project result was developed within the FV30033 "Design and manufacturing process development of primary aircraft parts of advanced shapes of reinforced thermoplastics" financed by MPO.

Status report on geopolymers (2019)

Zdeněk Mašek

The R-7145 report serves for clear and comprehensible documentation of the current state of development of geopolymers in VZLU in the first half of 2019.

This project result was developed within the institutional support of the Ministry of Industry and Trade of the CR directed to the development of research organizations.

 

Reinforced geopolymer foam (2019)

Zdeněk Mašek

The text gives the results of strength tests of reinforced geopolymer foam. The foam is reinforced with grids of various materials - glass, basalt and steel. Tensile and three-point bending strength tests were performed. It is shown that the strength values depend on the choice of reinforcement material and the relative volume of reinforcement and foam. Documented in R-7142 report.

This project result was developed within the institutional support of the Ministry of Industry and Trade of the CR directed to the development of research organizations.

De-icing of composite propeller blades with integrated heating elements (2019)

Vladimír Andrýsek 
Vilém Pompe

Publication at the professional seminar "New knowledge and results in the field of materials, technologies, tests and applications of composites in the aerospace industry of the Czech Republic" held at the Aerospace Research and Testing Institute, a.s. on 18. 04. 2019. The paper is available in the electronic journal TRANSFER, volume 2019, issue 33/2019.

This project result was developed within the FV30033 "Design and manufacturing process development of primary aircraft parts of advanced shapes of reinforced thermoplastics" financed by MPO.

Topography optimisation of the transport aircraft door bracket design (2019)

Radek Doubrava

Topological optimization is a modern method that brings a new direction in the design of technical objects. It aims is to determine the optimal distribution of the material in the design space. The result is documented by report R-7143 focused on optimizing the new design of pressurized fuselage aircraft doors using the Tosca Structure software and MSC / Nastran solver.

This project result was developed within the FV30033 "Design and manufacturing process development of primary aircraft parts of advanced shapes of reinforced thermoplastics" financed by MPO.

Variant study of aircraft door panel loading system made from carbon composite with thermoplastic matrix (2019)

Radek Doubrava 
Roman Růžek

The work presents with the design of a loading system for simulating the load of a spare panel of airliner door with a pressurized fuselage. The result is documented in R-7139.

This project result was developed within the FV30033 "Design and manufacturing process development of primary aircraft parts of advanced shapes of reinforced thermoplastics" financed by MPO.

Strength analysis of the development of a carbon fiber composite door of a transport aircraft with thermoplastic matrix - summary of works (2019)

Radek Doubrava

Report R-7155 summarizes the results of numerical simulations of the FEM development of a pressurized fuselage aircraft door demonstrator using a carbon composite thermoplastic matrix application. As a part of the solution, a global door model was created, and various solutions of the door supporting structure and fittings were designed and analyzed. The selected final solution was strength-optimized.

This project result was developed within the FV30033 "Design and manufacturing process development of primary aircraft parts of advanced shapes of reinforced thermoplastics" financed by MPO.

Analysis of the composite materials strain-rate influence for simulation of emergency load cases (2019)

Petr Bělský 
Radek Doubrava 
Roman Růžek

The work presents an assessment of the effect of strain-rate for simulation of emergency cases in terms of modelling composite materials and mechanical joints. The aim of this work is to design an approach to modelling global structures for simulation of emergency cases as collisions with foreign bodies (birds, hail, debris or barriers in the track, tree branches, etc.). The work is focused mainly on the refinement of material models and discretization of models of explicit FE solvers for application to real construction units such as rail vehicle fronts. The result is documented in R-7111.

This project result was developed within the TE01020038 project "Competence Centre for Rail Vehicles"  with financial support from TA CR.

New methods for non-destructive testing of sandwich structures in VZLU (2019)

Petr Bělský
Martin Kadlec

At the turn of 2017/2018, VZLU introduced new NDT methods suitable for automated C-scan inspections of sandwich structures. These were the water-squirt, Pitch-Catch and low-frequency Air-coupled ultrasonic methods and laser shearography. The detection capabilities of the methods were subjected to comparative study performed on flat honeycomb and foam core sandwich panels. Results of the realised tests can be used for successful selection of a suitable NDT method for sandwich structure inspections. Paper was presented at the 14th VZLU - Science, Research and Development Seminars in the Czech Aerospace Industry, the topic of which was “New knowledge in the field of materials, technologies, tests and applications of composites in the aerospace industry of the Czech Republic”.

This project result was developed within the institutional support of the Ministry of Industry and Trade of the CR directed to the development of research organizations.

Analysis of state of art in the field of composite structure manufacturing automatization (2019)

Jan Kužel

In the frame of technical report an analysis of concept of Industry 4.0 was made. The state of art of automated manufacturing systems intended for composite materials were also searched. Other possible directions of VZLU development in this area were indicated. Documented in R-7126 report.

This project result was developed within the institutional support of the Ministry of Industry and Trade of the CR directed to the development of research organizations.

Flutter Problems of Aircraft with Unconventional Wing Structure (2019)

Jiří Čečrdle
Ondřej Vích

Paper on conference: 14th International Conference on Vibration Problems, ICOVP2019, Crete, Greece, 1-4 September 2019

This project result was developed within the institutional support of the Ministry of Industry and Trade of the CR directed to the development of research organizations.

Whirl Flutter-related Certification According to FAR/CS 23 and 25 Regulation Standards (2019)

Jiří Čečrdle

Paper on conference: The International Forum on Aeroelasticity and Structural Dynamics 2019, IFASD2019, 10-13.06.2019, Savannah, USA

This project result was developed within the institutional support of the Ministry of Industry and Trade of the CR directed to the development of research organizations.

Reference Materials Analysis (2018)

Vladimír Dániel

The document describes the analysis of reference materials for the OPTIKOM project. Very low reflectivity (2%) materials were selected as reference. In 2018, the first reference sample reflectivity measurements were performed and SEM images of all samples were performed. From the measurements made, very low reflectance materials can be divided into five groups. At the end of the document there is a summary of selected materials and their properties. Documented in VZLU report R-7017.

This project result was developed within the FV20457 project "Composites with modified surface optical properties for space applications"  with financial support from Ministry of Industry and Trade of the CR.

Test plan (2018)

Vladimír Dániel

This document describes the tests planned on new materials developed within the OPTIKOM project. There are plans for verification and acceptance testing. Individual tests are generally described. Individual test procedures are not covered by this document but by separate tests. Documented in VZLU report R-7026.

This project result was developed within the FV20457 project "Composites with modified surface optical properties for space applications"  with financial support from Ministry of Industry and Trade of the CR.

Technology used for cleaning of electrodes in cataphoresis surface treatment (2018)

Martin Jindřišek

The report summarize results of development of cleaning technology for cataphoresis electrodes. Electrodes which can by easily cleaned can be used repeatedly and the process is more economical and ecological. Several method of cleaning was tested.

This project result was developed within the TH02020019 project "Development of new technology for mass coating using electrophoretic systems"  with financial support from TA CR.

Evaluation of paint systems corrosion resistance designed to protect compressors (2018)

Martin Jindřišek
Alena Koukalová
Kateřina Titěrová

The report summarize results of coating tests. These painting systems were designed as a compressors protection. Painting resistance was tested by deposition in high temperature and pressure environment. Properties were characterizes by adhesion test and visual evaluation.

This project result was developed within the TE02000011 project "Research Center of surface treatment"  with financial support from TA CR.

Comparison of selected coatings resistance protecting steel structures against UV radiation (2018)

Martin Jindřišek
Kateřina Titěrová

The report summarizes results of resistance against UV radiation measurement. Resistance was verified by xenon light radiation. Visual evaluation, coating adhesion, and gloss measurement was performed.

This project result was developed within the TE02000011 project "Research Center of surface treatment"  with financial support from TA CR.

Evaluation of chemical resistance of paint systems for integral fuel tanks (2018)

Alena Koukalová
Kateřina Titěrová

The report summarizes tests results. Paint systems for integral fuel tank were tested. Resistance of the systems was tested by immersion tests. Samples were evaluated visualy, thickness of layer was measured, paint adhesion, gloss and colour measurement was performed.

This project result was developed within the TE02000011 project "Research Center of surface treatment"  with financial support from TA CR.

Verification of paint system resistance by immersion tests (2018)

Martina Pazderová
Kateřina Titěrová

Final stage of verification tests was performed. Painting systems were tested for liquid resistance. Reagents were selected with regard to enviroments which can affect the surface. Immersion tests were used then adhesion tests, gloss and color measurements and visual evaluation was performed. The article was published in Transfer No. 31/2018.

This project result was developed within the TE02000011 project "Research Center of surface treatment"  with financial support from TA CR.

Modification of geopolymer composite components to improve its mechanical resistance (2018)

Linda Diblíková

Within the ICOMPO project "Advanced Composite Materials and Technologies", the improvement of the mechanical properties of the geopolymer composite is being solved. The report summarizes the procedures of improving the insufficient adhesion between the geopolymer matrix and the carbon reinforcement. The thermal oxidation of the carbon fiber tape reduced the contact angle by about 70° compared to the carbon fiber tape with sizing. The set metakaolin milling process of Mefista L05 allowed the average particle size to be reduced by as much as 3.44 microns. The ILLS test results showed that the highest strength, 19.7 MPa, was achieved for a thermally oxidized fiber composite and L30 resin containing unground metakaolin. Additions of organic substances adjusting the wettability and viscosity, reduced the strength of the composites, but at temperatures above 110°C they had a positive effect on reducing the geopolymer matrix shrinkage. Documented in R-6964 report.

This project result was developed within the institutional support of the Ministry of Industry and Trade of the CR directed to the development of research organizations.

Environmental effect on composite materials and structures in aerospace (2018)

Petr Homola

Short summary of the temperature, humidity and service fluids on composite material properties from aircraft manufacturer point of view, including materials behaviour comparison in dependence on various exposition parameters.

This project result was developed within the institutional support of the Ministry of Industry and Trade of the CR directed to the development of research organizations.

Composites in Aerospace (2018)

Martin Kadlec

A presentation of basic concepts of testing of polymer composites. Overview of basic test methods, failure modes and effect of environment on composite properties.

This project result was developed within the institutional support of the Ministry of Industry and Trade of the CR directed to the development of research organizations.

Blowing to the boundary layer to reduce the resistance of the sash to the strut (2018)

Zdeněk Pátek

Blowing the air jet is an effective tool for influencing the flow in the boundary layer as well as in the adjacent flow field. For a more pronounced effect, a relatively high momentum beam to which a sufficient air flow rate and a sufficiently high overpressure are needed to blow out a significantly higher velocity than is the basic incoming air flow needed. It is also necessary to consider the acoustic aspect, where the aerodynamically more efficient delivery of momentum by blowing a smaller flow rate at a higher speed is accompanied by a strong increase in noise. Documented in R-6969.

This project result was developed within the institutional support of the Ministry of Industry and Trade of the CR directed to the development of research organizations.

Aerodynamic problem solving a wing with strut - research (2018)

Zdeněk Pátek

The research was developed to obtain a basic idea of aerodynamic issues and the characteristics of the node connecting the wing with the strut and the current trends and possibilities in terms of airplane concept and design of the wing with strut. The issue of aerodynamic solution of the wing with the strut is very complex and universal knowledge is only very general, in most cases significant interference resistance can be expected, the lowest resistance is usually characterized by perpendicular restraint of the strut end into the wing. For an overall assessment of the advantage of a certain solution of the wing, it is necessary to evaluate the entire aircraft, including the consequences of non-design, but the regulations required, states. Documented in report R-6935.

This project result was developed within the institutional support of the Ministry of Industry and Trade of the CR directed to the development of research organizations.

Development of thermosetting matrix with hydrophobic properties (2018)

Martin Jakubec

Within the ICOMPO project we are developing a thermosetting matrix with hydrophobic properties. For this purpose, silica nanoparticles have been prepared, which can be stored in a dry state and used, whether as a nanofiller or an impregnating coating. Hydrophobization of nanoparticle surface has not yet been achieved and will be solved in the following two years of the continuation of the task. The elastic modulus was measured to verify the influence of both silica particles and the matrix properties; there was an increase over the pure thermosetting matrix. The results indicate that it may be interesting to direct the application of nanoparticles not only to their hydrophobic effect. Documented in report R-6955.

This project result was developed within the institutional support of the Ministry of Industry and Trade of the CR directed to the development of research organizations.

Expandable microspheres as a geopolymer blowing agent (2018)

Zdeněk Mašek

Within the ICOMPO project, the properties of a lightweight geopolymer binder formed on the basis of potassium water storage, amorphous silica and ground burnt lupine were studied. The binder was foamed in two ways. Mechanical properties, chemical resistance, thermal conductivity and porosity structure were monitored, depending not only on bulk density, but also on properties changes after additional curing at temperatures of 120-1000 ° C. Based on the evaluated properties, the selected geopolymer foam was compared with commercially available construction materials whose alternative it could be. Documented in R-6982 report.

This project result was developed within the institutional support of the Ministry of Industry and Trade of the CR directed to the development of research organizations.

Surface treatment of steel using Zn-Fe and Zn-Fe-W coatings (2018)

Jiří Bárta
Viktorie Weiss

The report summarizes results of the protective layer development for steel substrates and the results of validation tests. Documented in R-6986 report.

This project result was developed within the institutional support of the Ministry of Industry and Trade of the CR directed to the development of research organizations.

Development of non-freezing surface on aluminium alloys and it´s properties (2018)

Simona Ivanová

The report summarizes the results of the development of anti-icing surface treatment on aluminum alloys. Structural analysis and evaluation of hydrophobicity of surface treatment was performed on selected layers using the method of contact angle measurement. Documented in R-6987 report.

This project result was developed within the institutional support of the Ministry of Industry and Trade of the CR directed to the development of research organizations.

Surface treatment of titanium and its alloys (2018)

Michal Havlík
Jana Körberová
Věra Soukupová

A report summarizing possibilities of titanium surface treatment. Documented in R-6989 report.

This project result was developed within the institutional support of the Ministry of Industry and Trade of the CR directed to the development of research organizations.

Topology optimization of the satellite lid using the TOSCA software (2018)

Pavel Zdeněk

Topology optimization is a modern method that brings a new direction in the design of technical objects. Its aim is to determine the optimal distribution of material in the design space. This report focuses on optimizing the satellite cap using Tosca Structure software using MSC Nastran. Documented in report R-7005.

This project result was developed within the institutional support of the Ministry of Industry and Trade of the CR directed to the development of research organizations.

Methodology for deformation measurement of acoustically loaded panels (2018)

Pavel Zdeněk

The document describes the design, implementation and processing of the results of deformation measurement on the test specimen under acoustic loading using a contactless optical sensor. Application for measurement of deformation of test specimens under high-frequency load. Documented in R-6961 report.

This project result was developed within the institutional support of the Ministry of Industry and Trade of the CR directed to the development of research organizations.

Technological research of surface treatment enabling improvement of standard composite materials conductivity and resistance (2018)

Jiří Bárta
Lenka Hýlová

The report summarizes possibilities of achieving higher surface conductivity for standard composites, especially epoxy resin matrices, that metallic coatings can be applied to the surface by electrolysis. Documented in report R-6988.

This project result was developed within the institutional support of the Ministry of Industry and Trade of the CR directed to the development of research organizations.

Development of new technology for surface treatment of aluminium alloys by pulse anodization (2018)

Jiří Bárta
Viktorie Weiss

The report summarizes the technology of functional sample preparation - pulsed anodic oxidation of aluminium alloys. By optimizing the composition of the bath and the operating parameters, a layer having better properties than the commonly used aluminum coatings was achieved. Documented in R-6985 report.

This project result was developed within the institutional support of the Ministry of Industry and Trade of the CR directed to the development of research organizations.

Setup and design of wind turbines measurement experiment (2018)

Jan Červinka

Description of experimental simulation of wind turbine in wind tunnel. Documented in R-6994 report.

This project result was developed within the institutional support of the Ministry of Industry and Trade of the CR directed to the development of research organizations.

Determination of similarities of wind turbines physical modelling and proposal of design (2018)

Jan Červinka

Description of principles for physical modelling of wind turbines. Documented in R-6984 report.

This project result was developed within the institutional support of the Ministry of Industry and Trade of the CR directed to the development of research organizations.

Joining methods in spacecraft structures (2018)

Bohuslav Cabrnoch

The report summrizes the current structural design of spacecraft, focusing on joining methods of two dominant structural concepts of satellites, namely sandwich panels and lattice structures consisting of rod and strut systems. Documented in R-6981 report.

This project result was developed within the institutional support of the Ministry of Industry and Trade of the CR directed to the development of research organizations.

Pressure probes calibration equipment - flow field measurement and verification (2018)

Erik Flídr
Tomáš Jelínek
Martin Němec

In this work, a new calibration equipment for high-speed pressure probes calibrations was investigated. The experimental equipment and methods used in the research are described. Measurements of total and static pressure were performed by steady probes, total pressure measurement by a unsteady probe, accelerometer measurement. Three sample calibration on probes were conducted. The results obtained on NP2 probe were compared with previously obtained data. Documented in R-6957 report.

This project result was developed within the institutional support of the Ministry of Industry and Trade of the CR directed to the development of research organizations.

Verification of numerical models for simulation of high speed impacts by contactless point measurement system (2018)

Radek Doubrava
Ondřej Vích

The report includes the design, implementation and evaluation of a new displacement measurement technique for verification of numerical models and simulations of high speed impact tests. Documented in report R-6980.

This project result was developed within the institutional support of the Ministry of Industry and Trade of the CR directed to the development of research organizations.

Air nozzle reach assessment (2018)

Jan Šimák
Nikola Žižkovský

The document describes a method for evaluating the range of an air curtain without affecting the gravitational field. For this evaluation, the flow field calculations for the circular and straight line air nozzles were done. Documented in report R-6965.

This project result was developed within the institutional support of the Ministry of Industry and Trade of the CR directed to the development of research organizations.

Theoretical design of the exhaust system for active flow control (2018)

Miroslav Golda
Vítězslav Hanzal
Zdeněk Pátek
Jan Stárek
Martin Vyskočil

The report describes the theoretical design of the active flow control system. The report focuses on the design of the experiment with the strut-braced wing. The exhaust is considered in the connection of the wing and strut. Documented in report R-6974.

This project result was developed within the institutional support of the Ministry of Industry and Trade of the CR directed to the development of research organizations.

Accelerator and ionizator ion engine breadboard (2018)

Vladimír Dániel
Michaela Martínková

In 2018, a Accelerator and ionizator ion engine breadboard was built and tested. Its properties in laboratory conditions for pressures from 10 to 10-2 Pa has been verified by measurement, which is documented in this report. Measurement was carried out on an ionizator consisting of magnetic coils with magnetic fields. The behavior of a magnetic field ionizator and the corresponding frequency of RF electrodes has been successfully tested under laboratory conditions up to pressures of 0.04 Pa. At these pressures, a shining discharge was detected, and a non-zero current of accelerated ions was detected on the engine ion collector. Documented in R-6993 report.

This project result was developed within the institutional support of the Ministry of Industry and Trade of the CR directed to the development of research organizations.

Validation of simulation models to verify the aerodynamic effects of vehicles on its surrounding (2018)

Armand Drábek
Nikola Žižkovský

Summary research report (R-6967) describing the structure and details of the computational model for verifying the aerodynamic effects of vehicles its surroundings. The report is the result of Project No TE01020038 "The Center Competence of Rail Vehicles" is solved with TA ČR financial support, result no. TE01020038V023.

This project result was developed within the TE01020038 project "Competence Centre for Rail Vehicles"  with financial support from TA CR.

Aerodynamic effects on rail vehicles and its surroundings (2018)

Armand Drábek
Nikola Žižkovský

Comprehensive research report R-6966 analyzing the aerodynamic effects of rolling stock on the surrounding area. Results of verified simulations for different shapes of the external contour of rolling stock. Result no TE01020038V020.

This project result was developed within the TE01020038 project "Competence Centre for Rail Vehicles"  with financial support from TA CR.

Laser Beam Micro-Drilling Effect on Ti-6Al-4V Titanium Alloy Sheet Properties (2018)

Petr Homola, Roman Růžek

Laser beam micro-drilling (LBMD) is one of the most important non-contact machining processes of materials that are difficult to machine by means oeqf conventional machining methods used in various industries. The paper is focused on LBMD knockdown effect on Ti-6Al-4V (Grade 5) titanium alloy sheets properties. Two various process configurations were verified with a focus on laser damages in back-structure parts affected by the process. The effects of the LBMD on the material properties were assessed by means of tensile and fatigue tests and fracture surface analyses. Fatigue limit of LBMD configurations reached a significantly lower value between 15% and 30% of the static strength as compared to the reference raw material with 58% value. The farther back-structure configuration gives a two-fold fatigue life as compared to the closer LBMD configuration at a given stress applied.

This project result was developed within the institutional support of the Ministry of Industry and Trade of the CR directed to the development of research organizations.

Compression after impact of carbon/geopolymer sandwich panels (2018)

Robin Hron, Martin Kadlec, František Martaus

Geopolymers are amorphous aluminosilicate materials which combine low temperature, polymer-like processing with high temperature stability and fire resistibility without toxic smoke generation. The aim of the paper is to evaluate the impact resistance of the new material. The sandwich panels were manufactured from foam core and carbon fibre/geopolymer skins. Specimens with dimensions of 150 x 100 mm were extracted from the panels. Half of the panels were conditioned in hot/wet environment (70°C/85%r.h.) for two weeks. The drop weight impact tests were carried out in accordance with ASTM D7136M with two levels of impact energy to apply both VID (visible impact damage) and BVID (barely visible impact damage). Then the specimens were loaded by compression according to ASTM D7137M in room temperature conditions. The results showed significant effect of the environmental conditioning on the compression strength. The performance was also affected by the impact damage energy and skin/core adhesive type. During loading, deformation field was measured using a digital image correlation system. This research can establish new fire resistible sandwich materials to be used in aerospace constructions.

This project result was developed within a European project No. 640597 Future Sky Safety financed by the European Commission.

Determination of criteria and definition of regional wind simulation in the vicinity of TEN-T and VRT (2018)

Petr Vrchota

The report deals with the determination of wind performance criteria for high-speed trains in selected areas of planned high-speed lines in the Czech Republic. The interest areas were selected on the basis of the individual plans of the high-speed lines and the weather maps of the Czech Republic, where the directions and speeds of the prevailing winds are statistically processed. Documented in report R-6978.

This project result was developed within the institutional support of the Ministry of Industry and Trade of the CR directed to the development of research organizations.

Behavior of composite materials at low speed impact (2018)

Martin Kadlec

Presentation on the influence on the properties of composite materials and constructions presented in the seminar “The behaviour of composites after impact” conducted by the Academy of Sciences of the Czech Republic in Prague on 13 November 2018.

This project result was developed within the institutional support of the Ministry of Industry and Trade of the CR directed to the development of research organizations.

Dynamic Analysis of Two-stage Turbine Stand (2018)

Jiří Čečrdle, Ondřej Vích

This result documents dynamic analysis of two-stage turbine test stand. It includes normal modes analysis (excluding rotation of a rotor) and mainly comlex modes analysis (rotor dynamics, including rotor rotation). Parameters are rotor rpm and stiffness of support (bearings). Analyses include identification of instabilities and whirl resonance frequencies. Documented in report R-6962.

This project result was developed within the institutional support of the Ministry of Industry and Trade of the CR directed to the development of research organizations.

Methodology of Flutter Analysis Using transfer Functions, Part 1 (2018)

Jiří Čečrdle

This result represents methodology of flutter analysis using transfer functions. Transfer functions introduce non-structural degrees-of-freedom into computational model. This approach is usefull especially for modelling of control systems, servo-systems, closed-loop active control systems, etc. Theoretical background is summarised and the methodology of transfer function modelling is presented. Application examples include flutter analysis including an autiopilot system and flutter analysis including two modes of a control surface flapping. Both tasks are demonstrated on the strucure of L 410NG aircraft by means of the NASTRAN system. Documented in report R-6914.

This project result was developed within the institutional support of the Ministry of Industry and Trade of the CR directed to the development of research organizations.

Mechanical properties of AM/composite hybrid structures (2018)

František Martaus

The report documents verification of selected mechanical parameters of hybrid structures based on thermoplastic material made by Fused Deposition Modelling print technology (FDM) and carbon-epoxy (C/E) composite. Quality of connection (adhesion) of both materials was tested applying Double Lap Shear (ASTM D3528) and Single Lap Shear (ASTM D1002) methods. Polyamide (PA) and polylactic acid (PLA) were materials of the thermoplastics adherends, both filled with short carbon fibers and printed with a fill density of 20% and 100%. Carbon fabric - epoxy composite infused with low-viscosity epoxy was on the side of composite adherends. Bonding of the adherends was carried out in two ways: a) by infusion of the composite "in situ" on the thermoplastic adherend and b) by bonding the adherends using epoxy adhesive. Parallelly three different surface finishes of thermoplastic adherends were tested (degreasing, roughening, without treatment). Documented in report R-6954.

This project result was developed within the institutional support of the Ministry of Industry and Trade of the CR directed to the development of research organizations.

Fatigue test of carbon/geopolymer fiber composite (2018)

František Martaus

The report documents tests, methodically conceived as comparison of static properties of "virgin" material without prior cyclic loading to material loaded with defined fatigue parameters (amplitude, frequency, the number of cycles). Shear test according to ASTM D 3518 (Standard Test Method for In-Plane Shear Response of Polymer Matrix Composite Materials by Tensile Test of 45 ° and ± Laminate) was chosen due to its high sensitivity to fiber-matrix interface quality, where is the reasonable assumption of fatigue damage developing. Five samples were tested, each of which completed 10 million oscillations with an amplitude of about 1300 µm. m-1 without visible damage. Subsequent verification of stiffness of cyclically loaded samples relative to the "virgin" file showed the reduction of the module of elasticity of approximately 20%. In terms of static strength no statistically significant differences were found between the two sets of samples. Documented in report R-6959.

This project result was developed within the institutional support of the Ministry of Industry and Trade of the CR directed to the development of research organizations.

Methodology of thermal and mechanical fatigue analysis (2018)

Jiří Had

The research report deals with the issue of thermo-mechanical fatigue. The first part of the report describes the theoretical basis, the second part of the report describes how to implement the prediction apparatus underlying the TMF_PRED program. The third part of the report contains the processing of available experimental data for the last part of the report where numerical analyzes and validation of the prediction apparatus are performed. Documented in report R-6853.

This project result was developed within the TH02010111 project "Improvement of GE H75 turboprop engine product quality by modifications required for utilization in training acrobatic aircraft" with financial support from TA CR.

Low-energy impact stress analyses (2017)

Jan Raška,
David Novotný

In order to different composite material comparison, in terms of low-energy impact resistence, the test sets on the downfall impactor were effected. Documented in R-6717 report.

This project result was developed within the TE02000032 project "Advanced Aerostructures Reseach Centre"  with financial support from TA CR.

Fatigue behavior and damage tolerant design of bonded joints for aerospace application on Fiber Metal Laminates and composites (2017)

Roman Růžek et al.

Today, the application of adhesive bonding technology for primary aerospace structures is limited due to the certification regulations. State of the art is the widely used “chicken rivet” as crack arrestor which is limiting the benefits of bonding technology, particularly in composite bonded joints. In this paper results from fatigue testing of novel design approaches for damage tolerant high load transfer (HLT) joints as e.g. Panel Joints or large bonded repairs will be discussed for CFRP and for Fiber Metal Laminates´(FML) dherents. Results from fatigue testing with Wide Single Lapshear (WSLS) specimen will be presented for different configurations to proof the crack stopping behavior of sate of the art fasteners as reference crack arrestor concept.

This project result was developed within the 7E13058 project "Boltless assembling Of Primary Aerospace Composite Structures (2013 - 2016)" financed by the European Commission and cofinanced by MŠMT.

AFGROW fatigue crack propagation models and their applications (2017)

Jiří Běhal

The report summarizes results of fatigue crack propagation tests during loading by random sequences of load peaks simulating the operational loads of transport aircraft (TWIST load sequences) as well as aerobatic, training and combat (FALSTAFF load sequences) performed in the VZLU. At the same time, calculations of fatigue crack propagation in the test bodies are used using the FASTRAN, WILLENBORG and WHEELER computational models implemented in the AFGROW program. The material characteristics entering the calculations were measured on test bodies made of the same materials, enabling very reliable evaluation of the calculation models in terms of their suitability for individual structural alloys and types of loading processes. Documented in report R-6824.

This project result was developed within the institutional support of the Ministry of Industry and Trade of the CR directed to the development of research organizations.

Testing of high entropy alloy coatings (2017)

Jiří Bárta,
Simona Ivanová,
Martina Pazderová

The report summarizes and comments on part of the NEFRIT2 project results on testing the properties of prepared coatings from spring to the end of 2017. The report deals with describing properties such as adhesion, corrosion resistance, reflectivity and methodology of their testing. Samples of coatings applied to steel or copper were specifically scratched by a special knife to assess adhesion. They were further exposed to a corrosive environment in a salt chamber and in a chamber with cyclic moist and heat to determine corrosion resistance. Electrochemical measurements gained parameters such as corrosion rates, corrosion currents and corrosion potential. Anticorrosive protection has been found to be twice the resistance of the uncoated substrate. In the case of a grid test, delamination or other anomalies did not occur and the coating thus proved to be a protective layer.

This project result was developed within the institutional support of the Ministry of Industry and Trade of the CR directed to the development of research organizations.

Corrosion and adhesion properties of high entropy alloy coating (2017)

Jiří Bárta,
Simona Ivanová,
Martina Pazderová

This work aims to provide an overview of CoFeMnMoNi High entropy alloy (HEA) coat ings prepared by electrodeposition from water solution. A pplication of e lectrodeposition in this field is not widespread and particularly from an aqueous medium is indeed unique. HEA coating was deposited on steel. The emphasis of this research is placed o n corrosion and adhesion properties of the prepared thin layers. Corrosion resistance of the coatings has been proven by salt spray test. Scratch test was performed on selected coatings to assess their adhesive properties. The morphology of the deposited c oatings was monitored by SEM (Scanning electron microscopy) and qualitative and quantitative information of these samples were determined by XRF (X -ray fluorescence).

This project result was developed within the institutional support of the Ministry of Industry and Trade of the CR directed to the development of research organizations.

Advanced DES simulations of oxy-gas burner located into model of real melting chamber (2017)

Vojtěch Běták

Conference Paper: The simulation of burner located in free stream has one disadvantage because it don’t take into account a recirculation of flue gasses in real melting chamber. Combustion processes and production of emissions may be affected by this simplification. Extension of previous simulation to the model containing simplified model of test melting chamber is described in this paper. For this simulation is used an OpenFOAM platform and DES model of turbulent flow field which allow to capture unsteady phenomena of reacting flow field in free stream and to simplify modeling of turbulent flow field in near wall region. There are discussed possible improvements of solvers due very high consumption of computational time.

This project result was developed within the VI20172020092 - Simulation of fire and smoke spreading inside critical infrastructure caused by accident or international aircraft attack (2017 - 2020) with financial support from the Ministery of Interrior of the CR:

Possibilities to monitor state of structure using Lamb waves (2017)

Lenka Michalcová

The Structure Health Monitoring (SHM) approach has the potential to significantly improve the operation and increase the service life of structures. It is a very complex set of technologies and algorithms that require new and modern approaches. Currently there is virtually no aircraft structure that would be operated solely on the basis of SHM access. Therefore, current world research and development is focused on the development and research of technologies and methods that will make it possible to use SHM reliably in the future in relation to actual lifetime use of aviation structures. Development is focused, for example, on the innovation of storage and data acquisition systems, sensors, data processing, development of digital imaging algorithms, finite element simulation, and more. The leading role in all available SHM systems for aerospace constructions has over the last decade been played on the principle of active ultrasonic wave board generating transmitters.

This project result was developed within the institutional support of the Ministry of Industry and Trade of the CR directed to the development of research organizations.

Corrosion resistance of aluminium alloys´ protective coating (2017)

Vít Jonák,
Miroslav Štrobl,
Michal Havlík,
Martina Pazderová

The report summarizes the procedures and results of corrosion resistance of newly prepared protective coatings on aluminum alloys without Cr6+.

This project result was developed within the institutional support of the Ministry of Industry and Trade of the CR directed to the development of research organizations.

Painting system for integral fuel tank (2017)

Martina Pazderová,
Kateřina Titěrová

Within the framework of the development of paint systems for integral fuel tanks, the third stage of the tests was carried out to verify the suitability of the proposed coatings and the resistance of the system to external influences and resistance to the effects of liquids. On the basis of previously agreed methodology, the tests were carried out on the influence of temperature cycles and the second part of the samples were subjected to the diving tests. After individual exposures, the samples were visually evaluated, adhesion tests and gloss and color measurements were performed. Printed in Transfer journal no: 30/2017.

This project result was developed within the TE02000011 project "Research Center of Surface Treatment (2014 - 2019)" with financial support from TA CR.

Hydrophobization of geopolymer composite (2017)

Zdeněk Mašek

Geopolymer composites were impregnated by the incorporation of hydrophobic alkyl group into the outer surface and the inner structure of geopolymer. Ethoxysilanes 1H,1H,2H,2H-Perfluorooctyltriethoxysilane and hexadecyltrimethoxysilane were used as the source of the hydrophobic group. The modification of geopolymer composites was performed by their immersion in hydrophobic solutions, followed by drying at laboratory or increased temperature. The effectiveness of the procedure was evaluated by the measurement of contact angle on the composite modified surface, the amount of water absorbed by the composite, and its stiffness. The results confirmed that the silanes hydrolysed in sol containing SiO2 nanoparticles have greater hydrophobization effect than the solutions which did not contained SiO2 nanoparticles. The resulting impregnation procedure ensures the change of hydrophilic geopolymer surface to required hydrophobic. Documented in R-6885 report.

This project result was developed within the institutional support of the Ministry of Industry and Trade of the CR directed to the development of research organizations.

Situation report - Structure epoxy and geopolymeric foams (2017)

Martin Jakubec,
Zdeněk Mašek

This report is review of recent state of research in the field of reactoplastic and geopolymeric foams and provides relevant informations for planning of research within Czech aerospace research center (VZLU).

This project result was developed within the institutional support of the Ministry of Industry and Trade of the CR directed to the development of research organizations.

Modification of carbon fibers surface (2017)

Linda Diblíková

This report describes the results of the modification of carbon fibers surface in order to improve their adhesion to geopolymer matrix. Five oxidation methods were tested - chemical oxidation, the application of coupling agent, plasma treatment, ozone treatment and heat treatment. A significant decrease of contact angle was reached by all methods, i.e. the wettability of the carbon fibers was increased in all cases. No structural changes of the fibers were shown by microscopic characterization. The increase of the concentration of oxygen on the surface of the modified fibers and the oxygen-containing functionalities were identified using X-ray photoelectron spectroscopy. Interlaminar shear strength test confirmed the adhesion for two samples treated by plasma oxidation in argon atmosphere. At the same time, it also showed the necessity to improve the geopolymer resin itself and the procedure of ILSS specimen preparation. Documented in the R-6784 report.

This project result was developed within the institutional support of the Ministry of Industry and Trade of the CR directed to the development of research organizations.

Changes in strength and stifness of a polymer composite related to temperature and environment (2017)

Martin Kadlec

Presentation on a seminar of the Czech association for mechanics that was held on 22/11/2017 in Prague. The presentation deal with the effect of temperature and humidity on the changes of strength and stiffness of a polymer composite.

This project result was developed within the institutional support of the Ministry of Industry and Trade of the CR directed to the development of research organizations.

Report of the numerical solution (2017)

Petr Straka

The report describes the results of a study done by numerical simulation of the flow (CFD) by a simplified shaft seal model. The study was conducted to determine the effect of the rotation (or the absence of rotation) of the blades and the bottom wall of the shaft seal on the flow through the seal and on the output angle of the seal outlet flow. Documented in the R-6876 report.

This project result was developed within the TH02020086 "Influence of the seal leakage flows interactions on steam turbine efficiency" (2017-2020) with financial support from TA CR.

Design documentation for test rig modifications (2017)

Tomáš Jelínek, Marek Lojín

The result documents the design of test rigs modifications for the use of shaft seals on the both turbine test rigs in VZLU and ZČU. The documentation contains the manufacturing drawings of the parts that need to be implemented in order to perform an experimental investigation of the effect of the purge flow interaction on the axial turbine stage efficiency. In addition, the probes manipulators design documentation was realized to ensure better resolution of the existing probe manipulators on the test turbine rig, especially with respect to the traversing in the areas of the purge flow interactions with the main flow, so especially in the hub and tip areas of the blades.

This project result was developed within the TH02020086 "Influence of the seal leakage flows interactions on steam turbine efficiency" (2017-2020) with financial support from TA CR.

Proposal of damage tolerant design philosophy (2017)

Jiří Běhal

The report presents a proposal of DAMAGE TOLERANT design philosophy based on the Acceptable Means of Compliance AMC 20-29 with the provisions of CS-23 focused on a composite inlet air duct of the L-39NG airplane. Documented in R-6711 report.

This project result was developed within the TE02000032 project "Advanced Aerospace Research Center (2015-2019)" with financial support from TA CR.

Documentation for test preparation (2017)

Václav Horák, Jan Jironč, David Novotný, Vladimír Snop, Karel Touš

The following tests were carried out: Static L39NG Aileron Strength Test (L39NG-PK-211 design documentation was prepared, P-PK-0071/17/ZK protocol was prepared, design documentation of the cloth hangings no. L00-PK-137 was modified and tests for the separation of new materials for linings were carried out - protocol no. P-PK-0040/17 / ZK), Static strength test of the L39NG wing and Static Strenght test of the L39NG airframe.

This result was developed within TH02010670 project  "Development of airframe for the L-39NG next generation aircraft (2016 - 2019)" with financial support from TA CR.

Development of new technology for bulk coating by electrophoretic coating systems (2017)

Viktorie Weiss

Updating the current state of the problem solved with regard to current literary and patent sources. The first report summarizes the results of the patent research related to the technology of mass cataphoresis painting. The second report contains detailed survey of technologies for the electrophoretic coating of paints was elaborated in the report. Domestic and world resources have been studied, including information on mass electrophoretic coating technologies for metal components.

This project result was developed within the TH02020019 project "Development of a new technology for mass coating with electrophoretic coating systems" with financial support from TA ČR.

Methodology of the L39NG airframe static strength test up to the maiden flight (2016)

David Novotný

The document describes the methodology of the L 39 NG airframe full-scale static certification strength test in floating configuration. The test is mandatory before the maiden flight. Documented in R-6813 report.

This result was developed within TH02010670 project  "Development of airframe for the L-39NG next generation aircraft (2016 - 2019)" with financial support from TA CR.

Clamping system of rotor blades modernization (2016)

Jan Kužel,
Michal Král,
Pavel Petr,
Josef Kuta

Proposal of root section and composite skin structure of low-speed fan rotor blades. Proposals of variants rotor blades into impeller clamping. The strength and frequency control of blade and impeller components. Studying the shape effect on aerodynamic and strength parameters using FEM and CFD methods. Documented in R-6588 report.

This project result was developed within the TA04020228 project "Modern fans for energy and environmental equipment" with financial support from TA ČR.

Evaluation of substrate composition effect on HEA coatings adhesion (2016)

Martina Pazderová
Simona Ivanová
Jiří Bárta

The report describes experiments with substrate composition and effect on coatings adhesion. Documented in report R-6603.

This project result was developed within the institutional support of the Ministry of Industry and Trade of the CR directed to the development of research organizations.

Development of the electrochemical application technology of abrasion resistant coating from HEA (2016)

Jiří Bárta
Simona Ivanová
Martina Pazderová

The report summarizes and comments on part of the results of the NEFRIT project aimed at abrasion resistance of high entropy alloy coatings (HEA). The results are related to the effects of modifications of non-aqueous (DMSO) and aqueous galvanic baths used in the first half of 2016.

This project result was developed within the institutional support of the Ministry of Industry and Trade of the CR directed to the development of research organizations.

Experiments with HEA secretion from aqueous solutions (2016)

Simona Ivanová
Jiří Bárta
Martina Pazderová

The report summarizes the experimental results obtained in the electrochemical deposition of high entropy alloys (SVE) from aqueous solutions. The chosen substrate for electrodeposition was copper and steel. A smooth, metal-glossy, compact coating with a percentage of metallic elements in the desired equimolar amount with abrasion-resistant and corrosion-resistant properties was achieved.

This project result was developed within the institutional support of the Ministry of Industry and Trade of the CR directed to the development of research organizations.

Numerical simulation of the measuring system for the high-speed impact and numerical stress analysis of the experimental stand for the dynamic response research (2016)

Jan Raška

Numerical simulation of the measuring system for the high-speed impact and numerical stress analysis of the experimental stand for the dynamic response research. This computational approach based on FEM analysis is the basis for the design, optimization and computational verification of test equipment for research of dynamic response.

This project result was developed within the institutional support of the Ministry of Industry and Trade of the CR directed to the development of research organizations.

Corrosion resistance of exterior coating system (2016)

Martina Pazderová
Miroslav Valeš

In response to test results mapping anti-corrosion resistance of painting systems for different types of surfaces and pre-treatments, final verification of properties was performed. Based on previous results optimal combinations were used and tested for climatic and corrosion resistance. Samples were evaluated visually, adhesion test, measurement of gloss and colour changes after the tests.

This result was developed within TE02000011 project  "Surface Treatment Research Center (2014 - 2019)" with financial support from TA CR.

Fatigue Behaviour and Damage Tolerant Design of Composite Bonded Joints For Aerospace Application (2016)

Roman Růžek et al.

This paper gives an overview of the current research conducted within the European project BOPACS. The project is focussing directly on the application of Means of Compliance within AC-20-107B by investigating crack arrest by design features.  Results from the running test program are presented and the influence of individual test parameters highlighted. Finally, the influence on a certification strategy for structural bonding is outlined.

This result was developed within 7E12058 project "Boltless assembling Of Primary Aerospace Composite Structures (2013 - 2016)" with financial support of MoEYS.

Comparison of experimental and analytic evaluation of strain at loading of composite nacelle performed in the frame of 7. FWP ESPOSA (2016)

Václav Kafka Robin Hron
Ivan Mlch et al.

The report describes results of compression test of composite nacelle shell. The compression test of the component is proposed to verify the results of numerical analysis made in D6.5-7 'Detailed FEM analysis BE1'. The test component was mounted in a test frame and loaded.

This result was developed within 7E12035 project "Effective systems and propulsion for small aircraft (2012-2015)" with financial support of MoEYS.

High-energy impact of concrete debris into the composite structure – experimental tests and numerical simulations (2016)

Jan Raška

This paper deals with experimental and numerical studies of high energy impact of concrete debris into the composite structure, concretely, into a composite fan of the cooling system. The goal was to prove the functionality of the fan after defined concrete body impact.

This project result was developed within the institutional support of the Ministry of Industry and Trade of the CR directed to the development of research organizations.

Behaviour of composite material during high speed impact (2016)

Radek Doubrava

One load case in aircraft structure service is high speed impact with foreign object such us bird, hail, debris etc. These high-speed impacts of different energy can lead to hazards leading or serious structural damage with possible fatal consequences. The paper shows the approach to the evaluation of the proposed composite parts of the structure on the basis of experimental measurements and applications of numerical methods.

This project result was developed within the institutional support of the Ministry of Industry and Trade of the CR directed to the development of research organizations.

Feasibility study of research and development in the simulation of fast dynamic processes with high gradient of load or relative deformation (2016)

Martin Oberthor

The study describes the current state of VZLU in area of implementation fast transient and requirements for new test equipment. Study solves this topic and it provides an optimal solution in selecting an appropriate suppliers. Documented in R-6549.

This project result was developed within the institutional support of the Ministry of Industry and Trade of the CR directed to the development of research organizations.

Optimization of axial fan with swept blades (2016)

Aleš Prachař
Pavel Hospodář Tomáš Hofer

Optimization of axial fan with swept blades is described in this paper. Optimization target is defined as a maximum efficiency and minimum acoustic power. Documented in report R-6589.

This result was developed within TA04020228 project "Modern Fans for Energy and Ecological Facilities (2014-2017)" with financial support from TA CR.

Feasibility study of keeping and further progress and development in aircraft landing gear branch (2016)

Václav Horák

Feasibility study was elaborated in order to keep and progress and develop in aircraft landing gear branch. To meet of the goal of this study the following activities were completed: a) appropriate detailed analysis of status quo and demands for experimental research and certification tests in our country and in outside world, b) elaboration of possible alternatives of solution from point of view of feasibility, cost, terms and quality of aim achievement, c) selection of optimal option with conceptual proposal of the goal achievement, realisation plan and necessary cost estimation.

This project result was developed within the institutional support of the Ministry of Industry and Trade of the CR directed to the development of research organizations.

Damage prediction with coupled fatigue and creep mechanism applied on generator turbine (2016)

Jiří Had

Presented work is dealt with thermo-mechanical fatigue analysis of the generator turbine. Only elastic stress and temperature field are taken from FEM analysis. Strain is calculated using nonlinear Maxwell model to cover both elasto-plasticity and visco-plasticity. For stepwise stress history elasto-plastic and visco-plastic strain component are gain independently solving one after another. Elasto-plastic and visco-plastic strain component are linked together with the principle of superposition.

This project result was developed within the institutional support of the Ministry of Industry and Trade of the CR directed to the development of research organizations.

ILONA Regional turboprop airplane - Preliminary conceptual study (2016)

Zdeněk Pátek, Jaroslav Dostál

The study of a future turboprop regional airplane indicates: - there is a niche market in a category of 40 to 50 passengers - there are advanced available matured technologies that make possible to design a new advanced aircraft with significantly better characteristics (economy, operations, passenger comfort, manufacture, environmental pollution) than the currently produced airplanes.

This project result was developed within the institutional support of the Ministry of Industry and Trade of the CR directed to the development of research organizations.

Introductory study of aeroelasticity (2016)

Martin Lahuta

This report describes the preliminary results of the aeroelasticity computation with aplication on simple structures. Documented in report R-6630.

This project result was developed within the institutional support of the Ministry of Industry and Trade of the CR directed to the development of research organizations.

The modification of the ground plane for the train testing in 3mLSWT (2016)

Jan Červinka

The report describes the modification of the properties of the ground plane. The ground plane is intended for the testing of trains in wind tunnel. Documented in a report R-6614.

This project result was developed within the institutional support of the Ministry of Industry and Trade of the CR directed to the development of research organizations.

The measurement of the effect of the train forefront shape on its aerodynamic characteristics (2016)

Jan Červinka

The wind tunnel measurement was used to study the effect of the train forefront shape on its aerodynamic characteristics. Documented in a report R-6649.

This project result was developed within the institutional support of the Ministry of Industry and Trade of the CR directed to the development of research organizations.

Evaluation of the wing lift distribution from wake survey (2016)

Robert Kulhánek
Zdeněk Pátek

The wake integral methods for the measurement of the wing lift distribution were tested on the model of clean wing and in the configuration with the extended flap and winglet. The wake integral methods can provide the information about the wing lift distribution relatively fast. However the difference between the simple theoretical computation and the results from wake integration was found.

This project result was developed within the institutional support of the Ministry of Industry and Trade of the CR directed to the development of research organizations.

The measurement results of 1,5-stage configuration of reaction axial turbine stage (2016)

Tomáš Jelínek
Martin Němec

The report summarizes the results of measurements performed with a 1.5-degree arrangement of reaction axial turbine stage Doosan Skoda Power. The measurement of integral characteristics and detailed measurements of flow fields at the exit of the rotor and the exit of the second stator were performed. The results (integral characteristics and results of the detailed flow field measurement) were compared with results from a separate stage.

This result was developed within TA04020129 project "Flow studies in multistage axial turbine stages (2014-2017)" with financial support from TA CR.

Automated workplace for ultrasonic inspection of composite parts in VZLU (2016)

Petr Bělský

The first part of the article gives a brief information about history of the current laboratory for ultrasonic testing in VZLU. Development of new automated manipulator for nondestructive testing and implementation of a number of partial modifications of immersion tank accessories are presented in the next part. The end of the paper contains some interesting examples of everyday NDT activities realised in VZLU-department PK3200.

This project result was developed within the institutional support of the Ministry of Industry and Trade of the CR directed to the development of research organizations.

Delamination Analysis in CFRP composites in different testing conditions (2016)

Lenka Michalcová

In this paper, delamination crack growth monitoring in a climatic chamber of DCB specimens using acoustic emission (AE) method is described. A relationship between cumulative AE energy, events localization, clusters, and crack growth in a plain-weave carbon fibre–reinforced epoxy is investigated under constant displacement rate loading at + 80 °C, and − 55 °C. Test results are evaluated for specimens with multi-walled carbon nanotubes (MWCNT) in the microstructure and for a reference material.

This project result was developed within the institutional support of the Ministry of Industry and Trade of the CR directed to the development of research organizations.

Performance of Impacted Non-Conventional Carbon Fiber-Reinforced Polymer in Shear - Test and Finite Element Analysis (2016)

Jakub Šedek

The performace of an impacted carbon fibre-reinforced polymer(CFRP) in a shear is presented. Finite element anylysis (FEA) of the impact and subseguent shear loading was performed. Ply-by-ply method of composite modelling in conjuction with cohesive zone technique was utilized. Good match of delaminated area in comparison with test is obtained. The higher shear capability of non-impacted panel that impacted is numerically predicted.

This project result was developed within the 7E13059 "CreAting NonconventionAl Laminates (2013 - 2016)", with financial support from MoYES.

Fans for cooling units - aerodynamic design of the sicle blade type (2015)

Pavel Hospodář, Tomáš Hofer

In the report R-6430 an optimization method for axial sicle blade from the point of view of efficiency and noise is presented.

This project result was developed within the TA04020228 project "Modern fans for energy and environmental equipment" with financial support from TA ČR.

The results of measuring the impact of the turbulence and boundary layer at the inlet of axial turbine stage (2015)

Tomáš Jelínek, Martin Němec

The report describes experiments performed on axial turbine stage aimed to assess the impact of inlet conditions on the stage efficiency. The intention was to study both the influence of the inlet turbulence and inlet boundary layer effect in order to evaluate the effects of inlet parameters on the stage efficiency as well in terms of the experimental stages adjustment. Measurements were performed in cooperation with Institute of Thermomechanics Academy of Sciences, which ensure hot wire anemometry. VZLÚ ensured the implementation of individual device configuration and steady and unsteady pressure probe measurement.

This result was developed within TA04020129 project "Flow studies in multistage axial turbine stages (2014-2017)" with financial support from TA CR.

Methodology for the design of modular composite bridge construction (2015)

Bohuslav Cabrnoch

Summary of general principles and design methods for the design of modular composite bridge structures so that they can be easily applied to a particular task.

This project result was developed within the TA02010501 - Modular system of bridges from advanced composite materials (2012-2015), with financial support from TA CR.

Interlaminar fracture toughness of composites with different matrices (2015)

Roman Růžek

The paper summarizes various methods for experimental determination of fracture toughness of composites with different matrices (carbon, PPS, PEEK). They discuss methods of data processing and its impact on the resultant characteristics, focusing on DCB test mode I.

This project result was developed within the institutional support of the Ministry of Industry and Trade of the CR directed to the development of research organizations.

Monitoring of crack propagation in CFRP composites loaded in different environments using acoustic emission (2015)

Lenka Michalcová

Seminar: Monitoring of crack propagation in a climatic chamber at DCB bodies using optical devices and the method of acoustic emission (AE). We investigated the relationship between cumulative energy AE and length of cracks in different climates. Mechanical properties represented by fracture toughness were correlated with AE data. Comparison of results for reference materials and materials with nanoparticles.

This project result was developed within the institutional support of the Ministry of Industry and Trade of the Czech Republic directed to the development of research organizations.

Fatigue and delamination of carbon fabric-reinforced epoxy composite with carbon nanotubes (2015)

Martin Kadlec

Jakub Šedek

Carbon fibre-reinforced epoxy composites are used in aerospace applications as primary aircraft structures where material fatigue can be an issue. Carbon nanotubes (CNTs) appear to enhance the fatigue resistance according to literature. This work presents the results of precise crack growth rate measurement on double cantilever beam (DCB) specimens made from a carbon fibre fabric-reinforced epoxy composite. Two plates were evaluated where the resin was enhanced using 0.5 % CNTs and a flame retardant forone of the plates. Loading in mode I was displacement controlled with R = 0.1, f = 4 Hz and a constant maximum strain energy release rate (GI)max during the cycle. The value of (GI)max was defined to be 20 % up to 60 % of the mode I interlaminar fracture toughness. The crack length was determined from the modified compliance calibration (MCC) method by video-recording the specimen edges.

This project result was developed within the 7E13060 project - Improving the aircraft safety by self healing structure and protecting nanofillers (2013 - 2015), with financial support from MoYES.

Mechanisms of polymer composites with continuous fibers (2015)

Martin Kadlec

Presentation of failure mechanisms of polymeric composites with continuous fibers during the technical workshop held on 25 November 2015.

This project result was developed within the institutional support of the Ministry of Industry and Trade of the Czech Republic directed to the development of research organizations.

Study of parameters of boundary layers on the walls of a supersonic wind tunnel (2015)

Veronika Barraclough

Milan Kladrubský

Study of parameters of boundary layers on the walls of a supersonic wind tunnel contains a comparison of theoretical calculations and numerical calculations based on code written in Fortran. From the theoretical calculations and numerical simulations based on the approximate calculation of the transition point from laminar to turbulent flow.

This project result was developed within the institutional support of the Ministry of Industry and Trade of the Czech Republic directed to the development of research organizations.

Measurement of wake behind cooling towers in a wind tunnel (2015)

Veronika Barraclough

The study contains results of an experiment conducted by Particle Image Velocimetry. The experiment was conducted in a tunnel with atmospheric boundary layer in the system of four cooling towers for subcritical Reynolds number.

This project result was developed within the institutional support of the Ministry of Industry and Trade of the Czech Republic directed to the development of research organizations.