| 运行激励下结构模态参数测试方法及其实现 |
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| 引用本文： | 李长玉,王丽.运行激励下结构模态参数测试方法及其实现[J].电子测量与仪器学报,2016,30(4):577-582. |
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| 作者姓名： | 李长玉 王丽 |
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| 作者单位： | 华南理工大学广州学院汽车工程学院 广州 510800 |
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| 基金项目： | 广东省质量工程项目(51-SC150201)，华南理工大学广州学院青年科研基金项目(XQ114016) |
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| 摘 要： | 提出了一种在结构自身运行激励下只根据响应信号测试结构模态参数的方法—"峰值法"。通过MATLAB软件编程实现了该方法,并且利用传统的锤击方法和"峰值法"对一金属圆盘进行了实验模态分析。通过对比分析发现采用两种不同方法所取得的结果在前两阶模态中固有频率误差分别为1.6%和1.7%,阻尼比误差分别为7.2%和11%,振型整体趋势一致。从而验证了该方法的正确性。该方法适合不容易被激振的大型结构,而且能够分析结构在运行激励情况下的振动特性。
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| 关 键 词： | 模态分析 运行激励 锤击法 峰值法 固有频率 |
Structural modal parameters testing method and its implementation under excitation of operation |
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| Li Changyu and Wang Li.Structural modal parameters testing method and its implementation under excitation of operation[J].Journal of Electronic Measurement and Instrument,2016,30(4):577-582. |
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| Authors: | Li Changyu and Wang Li |
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| Affiliation: | College of Automotive Engineering, Guangzhou College of South China University of Technology, Guangzhou 510800, China and College of Automotive Engineering, Guangzhou College of South China University of Technology, Guangzhou 510800, China |
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| Abstract: | A structural modal parameters testing method (peak picking method )under excitation of operation is presented.Matlab software is used to realize the method.The experimental modal analysis of a metal disc is carried out by using peak picking method and traditional impact method.The result of different method is compared.It is found that in the first two order modes,the normal frequency errors are about 1 .6% and 1 .7% respectively,the damping ratio errors are 7.2% and 1 1% respectively,the mode shapes are approximately the same.Thereby the accuracy of the peak picking method is verified.The method is suitable for the large structure which is not easy to be excited.Moreover,the vibration characteristics of the structure can be analyzed by this method. |
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| Keywords: | modal analysis excitation of operation impact method peak picking method normal frequency |
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