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针对某车型在特定车速下出现的驾驶室异常振动的问题,通过汽车道路试验,测试了不同车速下车桥、车架、驾驶室上各测点的振动信号。结果显示,车速约为50km/h时,驾驶室纵向出现明显的异常振动。本文建立了汽车结构的有限元模型,并对其进行了模态分析,获得了整车的固有振动特性。结合仿真分析与实验测试结果发现,引起驾驶室异常振动的原因是车轮的转频5.57Hz与整车一阶弯曲模态频率5.49Hz接近从而发生共振。在此基础上,对车架进行了优化设计和结构修改,并对改进后的样车进行了试验测试,结果表明异常振动振幅降低了90%,较好地解决了驾驶室异常振动问题。
Aiming at the problem of abnormal vibration of cab in a certain vehicle speed, the vibration signal of each measuring point on the axle, frame and cab under different vehicle speeds was tested through the road test of the vehicle. The results show that when the vehicle speed is about 50km / h, the cab longitudinal obviously abnormal vibration. In this paper, the finite element model of automobile structure is established, and its modal analysis is carried out to obtain the inherent vibration characteristics of the vehicle. According to the results of simulation analysis and experimental tests, it is found that the cause of abnormal vibration in the cab is that the frequency of 5.57Hz and the first order bending mode frequency of the vehicle are close to 5.49Hz so that resonance occurs. On this basis, the frame was optimized design and structure modification, and the improved prototype was tested. The results show that the amplitude of abnormal vibration is reduced by 90%, which can well solve the problem of abnormal vibration of cab.