Journal
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
Volume 74, Issue -, Pages 95-110Publisher
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ymssp.2015.04.016
Keywords
Nonlinear normal modes; Experimental data; Broadband excitation; Nonlinear system identification; Numerical continuation
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Funding
- European Union
- European Union (ERC Starting Grant NoVib) [307265]
- European Research Council (ERC) [307265] Funding Source: European Research Council (ERC)
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The objective of the present paper is to develop a two-step methodology integrating system identification and numerical continuation for the experimental extraction of nonlinear normal modes (NNMs) under broadband forcing. The first step processes acquired input and output data to derive an experimental state-space model of the structure. The second step converts this state-space model into a model in modal space from which NNMs are computed using shooting and pseudo-arclength continuation. The method is demonstrated using noisy synthetic data simulated on a cantilever beam with a hardening-softening nonlinearity at its free end. (C) 2015 Elsevier Ltd. All rights reserved.
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