Aeroelasticity of aircraft structures

Airliner Half-wing Research Demonstrator

Research activities and services:

Aeroelastic calculations and experiments

  • Load redistribution, divergence, control surface reversion, control surfaces flutter, structure´s aeroelastic response to gust and turbulence
  • Critical speed of aeroelastic phenomena
  • Modal calculations, normal or complex modes (mode shapes, eigenfrequencies, modal masses, damping ratios)
  • Whirl flutter calculations including optimization
  • Rotor dynamics (complex modes, resonance frequency, critical speed, Campbell diagram)
  • Updating of dynamic models according to the results of modal experiments
  • Aeroelastic optimisation
  • Aeroelastic analysis including dynamic effects of control systems (autopilot), servo-systems, systems of active control or alleviation (aeroservoelasticity)
  • Evaluation of structure response (flight tests, taxiing)
  • Development of SW tools for aeroelastic calculations, especially for whirl flutter
  • Aeroelastic measurements of dynamically similar models (load redistribution, control surface efficiency, flutter, aeroelastic response)
  • Design and manufacture of dynamically similar models of aircraft and non-aircraft structures
  • Advanced experimental models for whirl flutter research in wind tunnels
  • Aeroelastic certification of airframes according to FAR/CS 23, FAR/CS 25 regulations
  • Unsteady aerodynamic analyses, CFD-CSM analyses

 

Equipment:

  • SW NASTRAN, PATRAN, ABAQUS, MATLAB, SAF, ZAERO
  • In-house SW tools
  • PONTOS optometric system for 3D dynamic strain measurement

 

Research projects:

  • 3AS – “Active Aeroelastic Aircraft Structures”, (2002 – 2005, EC, 5th Framework program of EU, project No.  30888)
  • Research on Strength with Special Regard to Aircraft Structures”, (2004 – 2010, MYES- Research plans)
  • CESAR – ”Cost Effective Small Aircraft”, (2005 – 2009, EC, 6th Framework programme of EU, project No.  30888)
  • SADE – “Smart High Lift Devices for Next Generation Wing”, (2008 – 2011, EC, 6th Framework programme of EU, project No. 213442)
  • W-WING – “Development of aeroelastic demonstrator for experimental research of whirl flutter”, (2011 – 2015, MIT – institutional project)
  • ESPOSA -  ”Efficient Systems and Propulsion for Small Aircraft“, WP2.3 Whirl Flutter  (2011-2015, EC, 7th Framework program of EU, project No. 284859)
  • IAEROM - “Aeromechanics for transport vehicles of 21st century“, partial objective No. 3 (2018-2022, institutional funding from MIT ministry – so called “DKRVO” )

 

CONTACT PERSON:

Ing. Jiří Čečrdle, Ph.D., chief researcher, VZLU
tel.: +420 225 115 123, e-mail: cecrdle@vzlu.cz

 

REFERENCEs:

  • Čečrdle, J.: Aeroelastic Stability of Turboprop Aircraft: Whirl Flutter, In: Flight Physics – Models, Techniques and Technologies, Ed.: Konstantin Volkov, InTech Publications, Rijeka, Croatia, 1st ed. 2018, ISBN 978-953-51-3807-5, e-ISBN 978-953-51-3808-2, pp.139-158
  • Čečrdle, J. - Vích, O. - Malínek, P. : Wind Tunnel Test of a Whirl Flutter Aeroelastic Demonstrator , Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering, on-line first, 2017, ISSN 0954-4100
  • Čečrdle, J.: Whirl Flutter of Turboprop Aircraft Structures, Elsevier Science, Oxford, UK, 1st ed. 2015, ISBN 978-1-782421-85-6, e-ISBN 978-1-782421-86-3
  • Čečrdle, J.: Updating of Finite Element Model of Aircraft Structure According Results of Ground Vibration Test, Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering, Vol. 230, Issue 7, pp.1348-1356, 2015, ISSN 0954-4100
  • Čečrdle, J. - Hlavatý, V.: Aeroelastic Analysis of Light Sport Aircraft Using Ground Vibration Test Data, Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering, Vol. 229, Issue 12, pp.2282-2296, 2015, ISSN 0954-4100
  • Čečrdle, J. - Maleček, J.: Mechanical Concept of W-WING Whirl Flutter Aeroelastic Demonstrator, Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering, Vol. 229, Issue 8, pp.1485-1494, 2015, ISSN 0954-4100
  • Maleček, J. - Čečrdle, J. - Hlavatý, V. - Malínek, P.: Mechanical Concepts for Simulation of Nonlinearities on Aeroelastic Demonstrator, Journal of Aircraft, Vol. 50, Issue 2, pp.651-658, 2013, ISSN 0021-8669
  • Čečrdle, J.: Assessment of Aileron Tab Installation on Light Sport Aircraft Flutter Characteristics, Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering, Vol. 227, Issue 6, pp.1000-1008, 2013, ISSN 0954-4100
  • Čečrdle, J.: Analysis of Twin Turboprop Aircraft Whirl-Flutter Stability Boundaries, Journal of Aircraft, Vol. 49, Issue 6, pp.1718-1725, 2012, ISSN 0021-8669
  • Čečrdle, J. - Maleček, J. - Černý, O.: Aeroelastic Analysis of Twin Turboprop Aircraft, Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering, Vol. 225, Issue 5, pp.585-594, 2011, ISSN 0954-4100
  • Ricci, S. - Scotti, A. - Čečrdle, J. - Maleček, J.: Active Control of Three-Surface Aeroelastic Model, Journal of Aircraft, Vol. 45, Issue 3, pp.1002-1013, 2008, ISSN 0021-8669
  • Vrchota P. - Prachař A.: „Using wing model deformation for improvement of CFD results of ESWIRP project“, CEAS Aeronautical Journal, February 2018, Vol. 9, No. 2, pp. 361-372, DOI: 10.1007/s13272-018-0286-3
  • Prachař A. - Hospodář P. - Vrchota P.: “Gust Alleviation of Aeroelastic Aircraft Using CFD Simulation“, Transportation Research Procedia, January 2018, Vol. 29, pp. 366-375, DOI: 10.1016/j.trpro.2018.02.033
  • Vrchota P. - Prachař A. - Šmíd M.: „Improvement of Computational Results of NASA Airliner Model by Wing Modal Analysis“, Journal of Aircraft, February 2017, Vol. 54, No. 4, DOI: 10.2514/1.C033952
  • Prachař A. - Hospodář P. - Vrchota P.: GUST ALLEVIATION OF NASA COMMON RESEARCH MODEL USING CFD. Engineering Mechanics 2017, Svratka, Czech Republic; 05/2017
  • Vrchota P. - Prachař A.: Using wing modal deformation for improvement of CFD results of ESWIRP project. 5th CEAS Air and Space Conference, Delft, Netherlands; 09/2015
  • Vrchota P. - Prachař A.: Improvement of CFD results of NASA CRM by on-line mesh deformation using modal analysis of a wing. 33rd AIAA Applied Aerodynamics Conference, Dallas, Texas, USA; 06/2015, DOI:10.2514/6.2015-3153
  • Vrchota P. - Prachař A.: Improvement of CFD aerodynamic characteristics using modal deformation. 55th Israel Annual Conference on Aerospace Sciences, Tel Aviv & Haifa, Israel; 02/2015