| 应用时频表示进行结构时变模态频率辨识 |
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| 引用本文： | 续秀忠,华宏星,张志谊,陈兆能. 应用时频表示进行结构时变模态频率辨识[J]. 振动与冲击, 2002, 21(2): 36-40,44 |
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| 作者姓名： | 续秀忠 华宏星 张志谊 陈兆能 |
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| 作者单位： | 1. 上海交通大学机械工程学院,上海,200030
2. 上海交通大学振动、冲击、噪声国家重点实验室,上海,200030 |
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| 基金项目： | 上海汽车工业科技发展基金资助项目 |
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| 摘 要： | 本文应用线性和二次时频表示的方法，包括：线性时频分析方法短时傅里叶变换和二次时频表示魏格纳－维尔分布，进行了时变结构模态频率的辨识。通过对刚度连续变化的二自由度系统时变模态频率辨识的仿真，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频率的有效工具，魏格纳－维尔分布二次时频表示能够是到比基于短时傅里叶变换的谱图更好的辨识结果。
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| 关 键 词： | 时频表示 时变模态频率辨识 短时傅里叶变换 魏格纳－维尔分布 结构振动 时频分析 |
Time-Varying Modal Frequency Identification by Using Time-Frequency Representation |
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| Xu Xiuzhong Hua Hongxing Zhang Zhiyi Chen Zhaoneng. Time-Varying Modal Frequency Identification by Using Time-Frequency Representation[J]. Journal of Vibration and Shock, 2002, 21(2): 36-40,44 |
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| Authors: | Xu Xiuzhong Hua Hongxing Zhang Zhiyi Chen Zhaoneng |
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| Affiliation: | Xu Xiuzhong 2Hua Hongxing 2Zhang Zhiyi 1Chen Zhaoneng |
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| Abstract: | Two schemes of time_frequency representations have been developed and implemented to identify time_varying modal frequency of a two degrees of freedom system with changing stiffness.The study explores the relationship between frequency spectra based on short time Fourier transformation (STFT) and Wigner_Ville distribution(WVD).The characteristics of these two kinds of time_frequency representations are analysed to assess the validation of these time_frequency analysis methods to identify time_varying modal parameters.The simulated time_varying stiffness two degrees of freesom system is adopted as an example to identify time_varying modal frequency.The simulated results indicate that time_frequency analysis is an effective tool for identifying time_varying modal frequency. |
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| Keywords: | time_varying modolfrequency identification short time Fourier transformation Wigner_vill Distribution |
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