Abstract
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.
Original language | English |
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Pages (from-to) | 95-110 |
Number of pages | 16 |
Journal | Mechanical Systems and Signal Processing |
Volume | 74 |
Early online date | 8 May 2015 |
DOIs | |
Publication status | Published - 1 Jun 2016 |
Keywords
- Broadband excitation
- Experimental data
- Nonlinear normal modes
- Nonlinear system identification
- Numerical continuation