Complex dynamics of a nonlinear aerospace structure: Experimental identification and modal interactions

J.P. Noel, Ludovic Renson, Gaetan Kerschen

Research output: Contribution to journalArticle (Academic Journal)peer-review

55 Citations (Scopus)
466 Downloads (Pure)

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 languageEnglish
Pages (from-to)2588-2607
Number of pages20
JournalJournal of Sound and Vibration
Volume333
Issue number12
Early online date24 Feb 2014
DOIs
Publication statusPublished - 9 Jun 2014

Keywords

  • nonlinear system identification
  • aerospace structure
  • experimental data
  • nonlinear modal interaction

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