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FITTING MEASURED FREQUENCY RESPONSE USING NON-LINEAR MODES

✍ Scribed by C. GIBERT

Publisher
Elsevier Science
Year
2003
Tongue
English
Weight
902 KB
Volume
17
Category
Article
ISSN
0888-3270

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✦ Synopsis

The article is devoted to curve fitting of the measured frequency response functions (FRFs) of an actual beam with a non-linear component. A frequency response model, based on the non-linear normal modes (NNMs) approximated by the Ritz-Galerkin method and on a superposition assumption is built up. Identification of NNM is performed by minimising a cost function involving synthetised FRF and measured data and leads to natural frequencies, damping factors, mode shapes as functions of modal amplitudes.

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