Abstract: With the continuous improvement of the (Noise、Vibration、Harshness, NVH) level of automobile companies, users are paying more and more attention to ride comfort. Seat vibration is a key indicator of car ride comfort, and its magnitude directly affects vehicle ride comfort. There are many factors that affect seat vibration. The seat vibration problem caused by the dynamic unbalance excitation of the drive shaft is difficult to control effectively in engineering due to many influencing factors. The Reason of high-speed seat vibration caused by dynamic imbalance of transmission shaft was presented by this paper. The basic theory of imbalance excitation of transmission shaft was explained. The problem is analyzed from the excitation source and the transfer path respectively. By controlling the dynamic balance of the transmission shaft and the rear axle, the dynamic imbalanced excitation force can be reduced and the high-speed seat vibration can be reduced. At the same time, the transfer path analysis method is used to analyze the problem, the transfer path analysis model was established, and the key transfer path was determined. Determine the critical transmission path through computational analysis. The effective optimization scheme is developed. The validity of the scheme is confirmed through real vehicle verification.

Key words: Transfer path analysis; Dynamic imbalance; Exciting force; Seat vibration

摘要： 随着汽车噪声、振动与声振粗糙度水平的不断提高，用户越来越关注乘坐舒适性。座 椅振动是汽车乘坐舒适性的关键指标，直接影响车辆的乘坐舒适性。影响座椅振动的因素众 多，其中传动轴动不平衡激励引起的座椅振动占据主要地位，工程当中很难对其进行有效控 制。文章阐述了后驱商用车传动轴动不平衡引起的高速座椅抖动问题的产生原因，对传动轴 动不平衡激励产生的机理进行了详细说明。针对该问题，分别从激励源和传递路径进行分析。 通过对传动轴和后桥系统动平衡量控制，从而减小动不平衡激励力，降低高速座椅抖动。同 时利用传递路径分析法对座椅抖动问题进行分析，建立该问题传递路径分析模型。通过计算 分析，确定关键传递路径，制定有效的优化方案。通过实车验证，确定方案有效性。

关键词: 传递路径分析；动不平衡；激励力；座椅抖动