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- Title
Quantification of nonlinear output frequency responses for a general input based on volterra series and conditioned spectral analysis.
- Authors
Liu, Wentao; Zhang, Yun; Jiao, Shengshuan; Wu, Jiafeng; Yang, Yu'e
- Abstract
This paper focuses on the issue of quantifying nonlinear output frequency response components of different orders of nonlinear dynamical systems for a general excitation. An alternative approach is presented based on Volterra series and conditioned spectral analysis (CSA) theories. Firstly, a multiple-input/single-output (MISO) linear system with a series of power characterized inputs is obtained by decomposing the nonlinear system under analyzed based on Volterra series. Secondly, the correlations among the inputs of different orders are removed by utilizing CSA approach, obtaining an algorithm of identifying the nonlinear output frequency response functions (NOFRFs) and evaluating the contributions of different order nonlinearities to the output of the system. Two kinds of nonlinear systems were simulated numerically to verify the accuracy of the method. The results reached by the proposed method are very close to the numerical results obtained by the fourth order Runge–Kutta method. Finally, an experiment analysis was carried out, in which the vibration transmission properties of a bolt connection were tested when the bolt was fastened and loose respectively. The results of experiments reflected further the effectiveness of the method on distinguishing quantitatively the contributions of each order nonlinearities to the output of a nonlinear system.
- Subjects
VOLTERRA series; NONLINEAR systems; LINEAR systems; NONLINEAR dynamical systems; POWER series; RUNGE-Kutta formulas
- Publication
Nonlinear Dynamics, 2024, Vol 112, Issue 12, p10167
- ISSN
0924-090X
- Publication type
Article
- DOI
10.1007/s11071-024-09602-y