1.School of Materials Science and Engineering, Jiangsu University of Science and Technology, Zhenjiang 212100, China;
2.Jiangsu New Yangzi Shipbuilding Ltd., Jingjiang 214532, China;
3.School of Civil Engineering and Architecture, Jiangsu University of Science and Technology, Zhenjiang 212100, China;
4.School of Naval Architecture and Ocean Engineering, Jiangsu University of Science and Technology, Zhenjiang 212100, China;
5.College of Civil and Transportation Engineering, Shenzhen University, Shenzhen 518061, China
To improve the accuracy of structural instantaneous frequency identification, this paper proposed a new form of improved generalized S-transform（IGST）. The parameters selection method of window function in IGST was derived by concentration measure（CM）principle, and the improved multi-synchrosqueezing generalized S-transform（IMSSGST）was proposed combined with squeeze algorithm. The core idea of this algorithm is to perform multi-synchrosqueezing on the time-frequency distribution of IGST to the time-frequency ridge in a certain range. In terms of numerical simulation, the accuracy of the method was verified by using a time-varying structure of two-story shear frame. In the aspect of experiment, instantaneous frequency identification of a seven-story Reinforced Concrete（RC）shear wall structure was carried out, which verified the practicability of the method in practical engineering. Numerical simulation and experimental results show that this method can effectively improve energy aggregation of time-frequency analysis and accuracy of instantaneous frequency identification.
袁平平1, 2, 3，程雪莉4，王航航3，沈中祥3，任伟新5，张健4. 基于改进多重同步挤压广义S变换的结构瞬时频率识别研究[J]. 振动与冲击, 2022, 41(8): 193-198.
YUAN Pingping1,2,3,CHENG Xueli4,WANG Hanghang3,SHEN Zhongxiang3,REN Weixin5,ZHANG Jian4. A study on structural instantaneous frequency identification based on an improved multi-synchrosqueezing generalized S-transform. JOURNAL OF VIBRATION AND SHOCK, 2022, 41(8): 193-198.
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