Application of ISEGST in instantaneous frequency identification of nonlinear RC structures

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Journal of Vibration and Shock ›› 2021, Vol. 40 ›› Issue (22) : 283-288.

SHEN Zhongxiang1,2,3, YUAN Pingping1,3, LIU Yi1

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Abstract

In order to improve the accuracy of structural instantaneous frequency identification, a new form of generalized S-transform was used. The energy concentration measure（CM）was applied to optimally select the parameters of window function, and the improved synchroextracting generalized S-transform（ISEGST）was introduced by combining the new generalized S-transform and synchroextracting transform. Then, the ISEGST was applied to the instantaneous frequency identification of nonlinear reinforced concrete（RC）structures. The feasibility and effectiveness of this method were verified by a numerical example of three-story RC frame structure and a shaking table test of seven-story shear wall. The results show that ISEGST can effectively identify the instantaneous frequency of nonlinear RC structures, and it is a time-frequency analysis method with high accuracy.

Key words

instantaneous frequency / time-frequency analysis / energy concentration measure / improved synchroextracting of generalized S-transform

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SHEN Zhongxiang1,2,3, YUAN Pingping1,3, LIU Yi1. Application of ISEGST in instantaneous frequency identification of nonlinear RC structures[J]. Journal of Vibration and Shock, 2021, 40(22): 283-288

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