Identification of NNM using sliding window POD analysis

Simon Clément (1) , Sergio Bellizzi (1) , Bruno Cochelin (2) , Guillaume Ricciardi (3)

1 Sons
2 M&S - Matériaux et Structures
3 DTN - Département Technologie Nucléaire

In this paper, a method combining the Proper Orthogonal Decomposition (POD) and a time-frequency analysis (TFA) is presented. The POD method is a tool adapted to the study of multi-degrees of freedom systems, which can give some insight of the behaviour of complex nonlinear systems, whereas TFA is suitable for scalar signal with multi-frequency components. The method presented here is of principal interest in the case of swept-sine excitation of complex multi-DOF systems. The method can be used to extract the Non-linear Normal Modes (NNM). It is illustrated on a 3-degrees-of-freedom system.

Domains: Vibrations [physics.class-ph]; Vibrations [physics.class-ph]

Simon Clément, Sergio Bellizzi, Bruno Cochelin, Guillaume Ricciardi. Identification of NNM using sliding window POD analysis. 8th European Nonlinear Dynamics Conference, Jul 2014, Vienna, Austria. CR-ROM(2 p.). ⟨hal-01040701⟩