基于传递路径试验分析的车用风机噪声优化

针对某国产车型怠速开空调时轴流风机工作引起车内噪声偏大的问题,建立了传递路径分析模型,研究了风机振动传递率试验及分析方法。为保证传递函数的精度,采用矩阵求逆法获取车身端连接点的耦合激励力。结果表明,上横梁风机总成左安装点y向对车内噪声的贡献量最大。风机总成模态频率与激励力频率重合产生共振,通过优化风机总成隔振垫动刚度的方法,将激励力频率与风机总成的模态频率避开,较好地解决了该车内噪声问题。该传递路径研究为车用风机噪声控制提供了思路和依据。

Optimization of Vehicle Fan Noise Based on Transfer Path Trial and Analysis

Aiming at the problem of excessive noise inside the vehicle when the axial fan is working at idle air conditioning, a transfer path analysis model is established, and the trial and analysis method of fan vibration transmission rate is studied. Furthermore, the coupling excitations of body end connection points are obtained to ensure the accuracy of transfer function by matrix inversion method. The results show that the largest ratio of noise inside the vehicle is along the y direction of the fan assembly left mounting point of the upper beam, and the reason is that the modal frequency of fan assembly coincides with the excitation force frequency to resonance. The noise problem inside the vehicle is solved by avoiding excitation force frequency and fan assembly model frequency for optimizing the dynamic stiffness of fan assembly vibration isolator. The research of transfer path provides ideas and basis for the noise control of automotive fan.