ISEGST在非线性RC结构瞬时频率识别中的应用

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摘要为了提高结构瞬时频率的识别精度，本文采用了一种新的广义S变换，通过能量集中度（concentration measure ，CM）原理来优化选择窗函数的参数，并引入同步提取变换推导了改进同步提取广义S变换（Improved Synchroextracting Generalized S-transform，ISEGST）。将ISEGST应用到非线性钢筋混凝土（Reinforced Concrete，RC）结构的瞬时频率识别中，通过三层RC框架结构数值算例和七层剪力墙振动台试验来验证该方法的可行性和有效性。研究结果表明，ISEGST能有效识别非线性RC结构的瞬时频率，是一种准确性较高的时频分析方法。

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	沈中祥1
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	袁平平1
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	刘义1

关键词 ：瞬时频率, 时频分析, 能量集中度, 改进同步提取广义S变换

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

收稿日期: 2020-09-29 出版日期: 2021-11-28

引用本文:

沈中祥1,2,3，袁平平1, 3，刘义1. ISEGST在非线性RC结构瞬时频率识别中的应用[J]. 振动与冲击, 2021, 40(22): 283-288.
SHEN Zhongxiang1,2,3, YUAN Pingping1,3, LIU Yi1. Application of ISEGST in instantaneous frequency identification of nonlinear RC structures. JOURNAL OF VIBRATION AND SHOCK, 2021, 40(22): 283-288.

链接本文:

http://jvs.sjtu.edu.cn/CN/ 或 http://jvs.sjtu.edu.cn/CN/Y2021/V40/I22/283

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