关键词: 传递路径分析；动不平衡；激励力；座椅抖动

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