Modal Identification of Non-Linear Structures and the Use of Modal Model in Structural Dynamic Analysis

Date

2008-2

Author

Arslan, Özge
Özgüven, Hasan Nevzat

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One of the major problems in structural dynamics is to identify nonlinearity, which is usually local in large structural systems, and to conduct dynamic analysis of the non-linear system. In this work, a new approach is suggested for modal identification of a non-linear system. Modal parameters obtained through modal identification are used in harmonic response prediction at different forcing levels. The response at only the fundamental harmonic is considered. The model can also be used to predict the response of the non-linear system coupled with a linear system and/or subjected to structural modification. An iterative solution method is used in structural dynamic analyses. The identification method proposed is for systems where nonlinearity is between a single coordinate and the ground. Response dependent modal parameters of the non-linear system are obtained via modal testing at different response levels. The method presented is verified through case studies. In the case studies presented, a subsystem with cubic stiffness type non-linearity is considered and the simulated FRFs of the subsystem generated for various response levels are used as pseudo experimental values.

URI

https://hdl.handle.net/11511/105139

Collections

Department of Mechanical Engineering, Conference / Seminar