多参考点复频域识别技术在后视镜试验模态中的应用

摘要

The theory of multiple reference point complex frequency identification technology in the modal test is discussed and the rearview mirror test data is analyzed and processed,and then,the least square method of the complex frequency is used to obtain the initial modal parameters.The PolyMAX algorithm is used to identify the modal parameters of the rearview mirror and the modal synthesis and validation is used to verify the accuracy of the initial modal parameters and to get the accurate natural frequencies and mode shapes.%阐述了多参考点频域识别法理论,对某客车后视镜进行约束试验模态分析,并对后视镜试验模态的测试数据进行了分析处理,采用多自由度时域识别法中的最小二乘复频域法准确识别结构的模态参数,运用LMS PolyMAX法识别出该后视镜的模态参数,利用模态拟合和模态验证,对后视镜的模态参数的准确性进行分析和验证,得到精确的固有频率和振型.