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基于时频信息提取的两自由度时变模态参数识别方法

Time-varying Parameter Identification of 2-Dof System Using Time-frequency Information
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摘要 通过对非线性结构响应的Gabor小波谱进行重排,从中提取出反映系统频率的时频脊线,由脊线得到非线性结构的瞬时频率和幅值,进而识别出结构响应信号的骨架曲线.对1个两自由度结构的算例分析表明:通过重排谱和脊线能较理想地识别出系统的时变频率和骨架曲线,脊线的方法比常规的优化方法简便. Gabor wavelet spectrogram is reassigned to extract Time-frequency ridge. Then time-varying frequency and amplitude are gotten from Time-frequency ridge. Finally the skeleton curves of nonlinear system are calculated, which contain the characteristics of nonlinear system. An example of 2-dof system indicate that timevarying of frequency and skeleton can be well identified by reassignment spectrogram and ridges, and the method extracting ridge from reassignment spectrogram is better than the method of optimization.
作者 石志晓 李大望 周晶 李昕
机构地区 郑州大学土木工程学院 深圳大学土木工程学院 大连理工大学土木水利学院
出处 《河南科学》 2007年第6期896-899,共4页 Henan Science
基金 国家自然科学基金(50478050) 河南省高等学校创新人才基金 河南省教育厅自然科学基金(2007560020)
关键词 模态参数 时频重排 小波变换 脊线 modal parameter time-frequency reassignment spectrogram wavelet transform ridge
分类号 TP391 [自动化与计算机技术—计算机应用技术] O325 [理学—一般力学与力学基础]
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参考文献7

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二级参考文献17

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共引文献7

河南科学
2007年 第6期

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