某商用车高速工况驾驶室异常振动控制研究

Structure Optimization of Commercial Vehicle's Cab for Vibration Reduction

文章针对某商用车在高速工况时驾驶室出现异常振动问题进行研究。进行了整车道路试验、偏频试验和驾驶室模态试验,试验结果表明,异常振动原因为轮胎滚动频率、非簧载质量偏频和驾驶室一阶扭转模态发生耦合。根据驾驶室扭转刚度与扭转模态之间的关系,对驾驶室关键钣金件进行了加强,以提高其扭转模态。根据加强方案对驾驶室进行了改进,并进行了道路试验验证,结果表明,加强方案明显降低了问题车速下驾驶室振动峰值,异常振动消失,改进效果明显。

This paper studied for reducing the abnormal vibration of a commercial vehicle’s cab at high speed. The vehicle road test, bias test and cab modal test were done for analyzing the cause of the abnormal vibration. The data of test indicated that the frequency of tire rolling, the non- sprung mass natural frequency and the cab’s first-order reverse mode were coupled. According to the relationship between the torsion stiffness and the first mode of the cab, some key sheet metal parts of the cab were reinforced for improving its fist torsion mode. The road test was done for verification. The result indicated that the peak vibration of the cab under the speed reduced significantly. The improvement effect is obvious.