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中文摘要：
搭建了基于PolyMAX法的试验模态分析系统，在LMS模态分析模块下对JZQ-250型号齿轮箱进行了建模，采用多点激励单点响应法，对该齿轮箱进行锤击试验，对所采集数据进行分析处理，建立传递函数，通过PolyMAX模态参数识别方法来提取模态参数进行定阶、拟合，获得了该齿轮箱的各阶模态参数，通过与计算模态比较，证明两者的有效性和可靠性，为进一步改进齿轮箱的结构特性以及基于模态分析的齿轮箱故障诊断等提供了理论依据。并基于模态分析提取各阶固有频率，去除小波分解中对应频带分量，达到对故障信号的降噪处理。
英文摘要：
Based on the method of PolyMAX, a system of modal analysis is built, the model of JZQ - 250 gear - box is set up under the LMS modal analysis module. The relating modal datum are obtained by hammering test of sin- gle - input multi - output analysis method, then the transfer function is established after the analysis of modal datum. The various modal parameters of the gearbox are obtained by order selection and fitting of the datum which extracted through the method of PolyMAX Modal Parameter Identification. Through the comparison with calculating modal, the validity and reliability are proved. The theoritical basis for the improvement of the gear box structure characteristics and the fault diagnosis of gearbox are provided. The natural frequency is extracted from the modal analysis, the wavelet decomposition of the corresponding frequency band component is removed, and the noise reduction processing on the fault signal is achieved.
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