针对行星齿轮减速器，采用MIMO方法进行模态试验，将方案一（弹性绳悬挂）和方案二（弹性绳和充气轮胎混合支撑）两种形式下高频信号和低频信号得到的六组试验数据用LMS 模态分析软件进行处理，得到七阶模态频率及其振型，及各阶模态的模态质量、模态刚度和模态阻尼等信息。最后分别对两种方案进行模态可信度和有效性分析，分析结果表明，两种方案在模态参数估计上都能取得相对合理的结果，方案二在获取低频模态信息方面效果较好，而方案一在获取高频模态信息方面效果较好，具体应用时应根据所关心的频段和模态参数选取不同方案的数据进行参考。%Multiple Input Multiple Output (MIMO) method was applied to experimental modal analysis meth-ods on planetary gear reducer for modal test and analysis. Six groups test data under high frequency signal and low frequency signal in scheme 1(suspension of elastic rope) and scheme 2(mixed supports of infla-tion tire ) two support forms were processed by using LMS test. Lab 10a test software. System seven-order mode frequency and shapes, mode mass, mode stiffness, mode damp, and so on were obtained. Finally, mode reliability and validity were analyzed between scheme 1 and scheme 2. Analysis results show that both scheme 1 and scheme 2 have relatively logical results, scheme 2 has better effect in obtaining low frequency mode information and scheme 1 has better effect in obtaining high frequency mode information. Frequency range and mode parameter should be taken over when applying.
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