Assessment of Nonlinear System Identification Methods using the SmallSat Spacecraft Structure
In this paper, several techniques for nonlinear system identification are applied to a real-world structure, the SmallSat spacecraft structure developed by EADS-Astrium. This composite structure comprises two vibration isolation systems, one of which possesses mechanical stops. The loading case considered in the present study is a random (local) excitation. A careful progression through the different steps of the system identification process, namely detection, characterization and parameter estimation, is carried out. Different methods are applied to data resulting from numerical experiments, without having access to the finite element model which generated these data.
KeywordsWavelet Transform Coherence Function Excitation Level Nonlinear Spring Random Excitation
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