基于改进同步提取GST的结构瞬时频率识别  

Structural Instantaneous Frequency Identification Based on Improved Synchroextracting Generalized S-transform

作　　者：王航航 张健[2] 袁平平 任伟新 WANG Hanghang;ZHANG Jian;YUAN Pingping;REN Weixin(School of Civil Engineering and Architecture,Jiangsu University of Science and Technology Zhenjiang,212100,China;School of Naval Architecture and Ocean Engineering,Jiangsu University of Science and Technology Zhenjiang,212100,China;College of Civil and Transportation Engineering,Shenzhen University Shenzhen,518061,China)

机构地区：[1]江苏科技大学土木工程与建筑学院,镇江212100 [2]江苏科技大学船舶与海洋工程学院,镇江212100 [3]深圳大学土木与交通工程学院,深圳518061

出　　处：《振动．测试与诊断》2022年第3期543-548,620,共7页Journal of Vibration,Measurement & Diagnosis

基　　金：国家自然科学基金资助项目(51979130);江苏省自然科学基金资助项目(BK20191460);江苏省高等学校自然科学研究基金资助项目(20KJB560016)。

摘　　要：为了提高结构振动响应信号时频分析及瞬时参数识别的精度,对广义S变换(generalized S-transform,简称GST)进行改进,结合同步提取算法,提出了一种新形式的同步提取广义S变换。利用单自由度Duffing非线性系统和两层剪切框架结构模型的数值算例验证了该方法的正确性。设计时变拉索试验,分别采集结构在线性和正弦拉力变化下的加速度响应信号,利用改进同步提取广义S变换对信号进行瞬时频率识别,进一步验证了该方法的准确性。数值模拟和试验结果表明,该方法能有效识别非线性结构和时变结构的瞬时频率,具有较好的稳定性。In order to improve the accuracy of time-frequency analysis of structural vibration response signals and structural instantaneous parameters identification,the generalized S-transform is improved,and a new form of synchroextracting generalized S-transform is proposed by combining with synchroextracting algorithm. In the numerical simulation,the accuracy of the method is verified by the Duffing nonlinear system with single degree of freedom and the two-layer shear frame structure model. The time-varying cable test is designed,the acceleration response signal of the structure under linear and sinusoidal varying tension is collected. Then,the instantaneous frequency identification of the signal is extracted by improved synchroextracting generalized S-transform,which further verified the accuracy of the method. Numerical simulation and experimental verification show that the improved synchroextracting generalized S-transform can effectively identify the instantaneous frequency of non-linear structures and time-varying structures with good stability.

关 键 词：时变信号 瞬时频率 改进同步提取广义S变换 参数优化 时频分析 

分 类 号：TN911.6[电子电信—通信与信息系统] TU311.3[电子电信—信息与通信工程]