Modal tests 

We conduct modal tests on complete assemblies, dynamically similar models, structural parts, including establishing modal parameters. 

Activities » Structure and material testing » Modal tests
Modal test on L33 glider - excitation of tail surfaces
Files to download
Photogallery
Exciters on Ae270 aircraft propeller and fuselage front part
Arrangement of Ae270 aircraft modal test and mobile laboratory
Modal test on Raven 257 aircraft tail surfaces
Exciters located on Raven 257 aircraft tail surfaces
Modal test on L159 aircraft with stores
Modal test on L159 aircraft
Horizontal excitation of L 410 aircraft front landing gear supported by a sliding pad
Arrangement of L 410 aircraft front landing gear modal test
Calibration of the Pontos optometric system
Excitation of the V518 propeller by rotation of forces
CONTACT


Ing. Václav Horák
Head of Structural Testing Group, VZLÚ
Tel: +420 225 115 225, +420 724 412 230
e-mail: horak@vzlu.cz

Modal tests
WE OFFER:
  • Modal tests of entire structures, aero-elastic scaled models and aircraft structures (e.g. whole aircraft and their components, power plants, propellers, control systems, hydraulic actuators, skin fields and other structures)
  • Definition of modal parameters (frequency, mode shape, damping, generalized mass and stiffness)
  • Excitation of isolated vibration modes by accommodated sinus excitation
  • Sweep harmonic excitation, pulse excitation, white noise excitation
  • Graphic display of deformations and nodal lines
  • Animation of mode shapes
  • Modal parameters corrections for the extra mass and stiffness of the tester
  • Orthogonality verification and calculation of vibration mode correlation criteria
  • Transfer function definition
  • Input data preparation for flutter calculation
EQUIPMENT:
  • Mobile facility for modal tests, GVT (Ground Vibration Tests) using PRODERA tester with circuits to excite constructions by eight channel system; response measurement at 256 points
  • Software: P-WIN-MODAL to control modal tests
  • Software: MOPAR to treat modal test results


STANDARD SPECIFICATIONS:

  • Airworthiness and reliability regulations as applied to aircraft specific categories

APPROVAL CERTIFICATES:

  • ISO 9001:2000
  • Civil Aviation Authority of the Czech Republic (ÚCL) certificate to conduct strength test aircraft airframes and mechanical aircraft articles
CUSTOMERS:
  • Companies involved in design and development of aircraft and land transport vehicles
  • Engineering companies requiring to verify dynamic properties of their products or parts (experimentally or theoretically)
  • Universities and research establishments
Modal test on L159 aircraft with stores