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农用运输车在行驶时,受到地面多个激励,应该用多输入多输出模型的辨识方法识别其模态参数。文章提出了伪频响函数的新概念及其计算公式。用该函数可以利用双通道动态分析仪计算多输入多输出系统的频响函数,得到复杂系统的试验模态参数。用该方法对农用运输车进行了多输入试验模态分析,得出了优于单点激励的结果。
When a farm vehicle is driven by multiple motions on the ground, the modal parameters should be identified by the identification method of the multiple input multiple output model. The article proposes a new concept of pseudo-frequency response function and its calculation formula. Using this function, we can calculate the frequency response function of a MIMO system by using a two-channel dynamic analyzer to get the experimental modal parameters of a complex system. Using this method, a multi-input test modal analysis was conducted on agricultural vehicles, and the result was better than single-point motivation.