某车型怠速2阶抖动问题分析及优化研究

Analysis and optimization of 2nd-order vibration of a vehicle at idle speed

为解决某四缸燃油车在怠速关空调工况下存在的方向盘及座椅2阶抖动问题,首先采用“源—路径—响应”的分析方法,确定影响怠速2阶抖动问题的关键因子;然后通过优化前端冷却模块刚体模态以及降低排气系统吊钩力,解决了怠速2阶抖动问题。该研究对同类问题的前期规避和设计有重要的参考意义。

In order to solve the 2nd-order vibration problem of steering wheel and seat of a four-cylinder fuel vehicle when idling and air conditioning is turned off,the"source-path-response"analysis method is adopted to determine the key factors affecting the 2nd-order vibration problem at idling.Finally,the 2nd-order vibration problem at idling is solved by optimizing the rigid body mode of the front cooling module and reducing the hook force of the exhaust system.This research has important reference significance for the early avoidance and design of similar problems.