Abstract
Nonlinear system identification is a challenging task in view of the complexity and wide variety of nonlinear phenomena. The present paper addresses the identification of a real-life aerospace structure possessing a strongly nonlinear component with multiple mechanical stops. The complete identification procedure, from nonlinearity detection and characterization to parameter estimation, is carried out based upon experimental data. The combined use of various analysis techniques, such as the wavelet transform and the restoring force surface method, brings different perspectives to the dynamics. Specifically, the structure is shown to exhibit particularly interesting nonlinear behaviors, including jumps, modal interactions, force relaxation and chattering during impacts on the mechanical stops.
Original language | English |
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Pages (from-to) | 2588-2607 |
Number of pages | 20 |
Journal | Journal of Sound and Vibration |
Volume | 333 |
Issue number | 12 |
Early online date | 24 Feb 2014 |
DOIs | |
Publication status | Published - 9 Jun 2014 |
Keywords
- nonlinear system identification
- aerospace structure
- experimental data
- nonlinear modal interaction