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Wednesday, July 10 • 10:50 - 11:10
VIRTUAL SHAKER TESTING: FROM CONCEPT TO APPLICATIONS FOR SPACECRAFT STRUCTURES

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Virtual Shaker Testing (VST) in the context of spacecraft testing is a relatively new practice currently under investigation for significant improvement of the test procedures (both in terms of costs and efficiency) and of the following correlation activity. The issues currently experienced during large satellites' vibration testing are discussed, examining practical examples that highlight the coupling existing between the specimen under test and the facility, and that are the basis for the motivation behind this new methodology. From a practical point of view, VST consists in modelling not only the spacecraft, but also the shaker system and the other factors that affect the test measurements (e.g. delays due to amplifier), through the use of commonly used software, such as Nastran and Matlab Simulink. In this article, VST is applied to three different test cases, showing the advantages that can be brought both in a pre- and in a post-test scenario. In particular: i) BepiColombo on the ESA QUAD shaker; ii) BepiColombo on the ESA LLST shaker; iii) TEDY mass dummy on the ESA HYDRA shaker. The first two examples focus on the improvement of the correlation activity following the physical test, showing how modelling the facility allows performing a significantly more consistent comparison between computations and experimental data. The inaccuracies that are being made following the current practice will be here quantified through well-known correlation criteria (e.g. RVAC and FRAC). The last application, on the other hand, shows a possible application in terms of pre-test activity, where the potential of the hydraulic shaker in ESA, able to test on six degrees of freedom simultaneously, is demonstrated with virtual testing implementations before the actual test is run.

Moderators
ST

Stephan Tewes

Interior Noise Integration & Vibration, Airbus Operations GmbH

Authors

Wednesday July 10, 2019 10:50 - 11:10 EDT
St-Laurent 6
  T03 Aero… aircrft noise & vibr., SS01 Ac simul tst & cntrl in space