Obtaining Linear FRFs for Model Updating in Structures with Multiple Nonlinearities Including Friction

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148-IMAC XXXI-Obtaining Linear FRFs for Model Updating in Structures with Multiple Nonlinearities Including Friction_2013.pdf

Date

2013-2-11

Author

Özgüven, Hasan Nevzat
Canbaloğlu, Güvenç

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Most of the model updating methods used in structural dynamics are for linear systems. However, in real life applications structures may have nonlinearity. In order to apply model updating techniques to a nonlinear structure, linear FRFs of the structure have to be obtained. The linear dynamic behavior of a nonlinear structure can be obtained experimentally by using low forcing level excitations, if friction type of nonlinearity does not exist in the structure. However when the structure has multiple nonlinearities including friction type of nonlinearity, nonlinear forces due to friction will be more pronounced at low forcing level excitations. Then it will not be possible to measure linear FRFs by using low level forcing. In this study a method is proposed to obtain linear FRFs of a nonlinear structure having multiple nonlinearities including friction type of nonlinearity by using experimental measurements made at low and high forcing levels. The motivation is to obtain FRFs of the linear part of the system that can be used in model updating of a nonlinear system. The method suggested can also be used as a nonlinear identification method for nonlinear systems. The proposed method is validated with different case studies using SDOF and lumped MDOF systems and simulated experimental data. The effect of the excitation frequency, at which experiments are carried out, on the accuracy of the proposed method, is also demonstrated.

Subject Keywords

Nonlinear identification, Nonlinearity, Friction nonlinearity, Model updating, Nonlinear structures

URI

https://hdl.handle.net/11511/105126

DOI

https://doi.org/https://doi.org/10.1007/978-1-4614-6570-6_13

Conference Name

IMAC XXXI Conference

Collections

Department of Mechanical Engineering, Conference / Seminar

Citation Formats

H. N. Özgüven and G. Canbaloğlu, “Obtaining Linear FRFs for Model Updating in Structures with Multiple Nonlinearities Including Friction,” Garden Grove, California, 2013, vol. 1, p. 145, Accessed: 00, 2023. [Online]. Available: https://hdl.handle.net/11511/105126.