| 系统模态参数辨识的小波方法 |
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| 引用本文： | 刘宁,王太勇,赵坚.系统模态参数辨识的小波方法[J].天津大学学报(自然科学与工程技术版),2006,39(7):788-791. |
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| 作者姓名： | 刘宁 王太勇 赵坚 |
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| 作者单位： | [1]天津大学机械工程学院,天津300072 [2]国家海洋技术中心,天津300111 |
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| 基金项目： | 国家高技术研究发展计划(863计划) |
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| 摘 要： | 为研究小波变换在模态分析中的应用，并实验验证该方法的可行性，在小波分析良好的数值特性基础上．建立了基于系统自由响应信号连续小波变换的模态参数辨识方法．采用该方法进行仿真研究，仿真结果与理论值吻合.以悬臂梁为例进行实验研究，实验结果与理论计算结果吻合较好．尤其在阻尼比的识别上，相对误差在l％以下.仿真和实验研究表明，该方法计算简便．对比一般频域模态方法，该方法对模态参数识别更准确．
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| 关 键 词： | 模态分析 小波变换 固有频率 阻尼 |
| 文章编号： | 0493-2137（2006）07-0788-04 |
| 收稿时间： | 2005-02-21 |
| 修稿时间： | 2005-02-212005-12-23 |
Modal Parameter Identification Using Wavelet Transform Method |
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| LIU Ning,WANG Tai-yong,ZHAO Jian.Modal Parameter Identification Using Wavelet Transform Method[J].Journal of Tianjin University(Science and Technology),2006,39(7):788-791. |
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| Authors: | LIU Ning WANG Tai-yong ZHAO Jian |
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| Institution: | 1. School of Mechanical Engineering, Tianjin University, Tianjin 300072, China; 2. National Ocean Technology Center, Tianjin 300111, China |
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| Abstract: | In order to study the application of continuous wavelet transform in modal analysis and validate it's feasibility,a new modal parameter identification method was developed based on outstanding numerical charac- ter of wavelet transform.This method was used for simulation and the simulation result in accordance with the theoretical value.A cantilever beam was experimentally studied with this method and the result is consistent with theoretical result.This method is especially accurate in damping identification with the relative error less than 1% to theoretic values.The simulation and experiment show that this method has a character of simple cal- cuation.Compared with the normal frequency-domain modal analysis method,it is more exact in parameter iden- tification. |
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| Keywords: | modal analysis wavelet transform natural frequency damping |
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