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结构时变模态参数辨识的时频分析方法
引用本文:续秀忠,张志谊,华宏星,陈兆能.结构时变模态参数辨识的时频分析方法[J].上海交通大学学报,2003,37(1):122-126.
作者姓名:续秀忠  张志谊  华宏星  陈兆能
作者单位:上海交通大学,机械与动力工程学院,上海,200030
基金项目:上海市汽车工业科技发展基金资助 (2 0 0 10 87)
摘    要:应用线性和二次时频变换方法,即短时傅里叶变换和魏格纳—维尔分布,进行了时变结构模态参数的辨识.通过对刚度突变和刚度连续变化的单自由度系统时变参数辨识的仿真,论述了两种时频辨识方法的特点.仿真结果表明,时频变换辨识方法是辨识时变模态参数的有效工具,而且魏格纳—维尔分布二次时频表示能得到比基于短时傅里叶变换的谱图更好的辨识结果.

关 键 词:时变结构  模态参数  时频分析方法  参数辨识  短时傅里叶变换  魏格纳—维尔分布  谱分析
文章编号:1006-2467(2003)01-0122-05

Time-Varying Modal Parameter Identification with Time-Frequency Analysis Methods
XU Xiu zhong,ZHANG Zhi yi,HUA Hong xing,CHEN Zhao neng.Time-Varying Modal Parameter Identification with Time-Frequency Analysis Methods[J].Journal of Shanghai Jiaotong University,2003,37(1):122-126.
Authors:XU Xiu zhong  ZHANG Zhi yi  HUA Hong xing  CHEN Zhao neng
Abstract:Two schemes of time frequency representation were developed and implemented to identify the time varying modal frequencies of single degree of freedom system with changing stiffness. This study explored the relationship between the spectrograms based on short time Fourier transformation (STFT) and the Wigner Vill distribution (WVD). The characteristics of those two kinds of time frequency representations were analyzed. To assess the validation of those time frequency analysis methods to identify time varying modal parameters, two simulated stiffness changing single degree of freedom systems were used to identify time varying modal frequencies. The simulated results indicate that the time frequency analysis method is an effective tool for identifying time varying modal parameters.
Keywords:time  varying  modal parameter identification  short time Fourier transform (STFT)  Wigner  Vill distribution (WVD)  
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