某纯电动汽车空调振动分析与优化

针对某纯电动乘用车在怠速、开空调时车内振动较大的问题,通过振动传递特性测试及模态分析,确定空调压缩机在转速为2300 r/min时振动较大是由于空调压缩机自身激励与冷却风扇产生拍振所导致,在转速为5000 r/min时振动较大是由于压缩机工作基频与其自身刚体模态耦合所导致.最终,通过调整空调压缩机转速,将原2300 r...

Analysis and Optimization of Air Conditioner Vibration of a Pure Electric Vehicle

The problem that the interior vibration of a pure electric vehicle is very large when the air conditioner operates at idle speed is studied.Several vibration transmission tests and modal analysis are carried out and the reason of the obvious vibration is found.It is confirmed that when the air conditioning compressor works at the speed of 2300 r/min,there is a beat vibration between the air conditioning compressor and the cooling fan;while at the speed of 5000 r/min,the basic frequency of the compressor is coupled with its own rigid modal.Both reasons above cause the large internal vibration of the vehicle.Eventually,by changing the speed of the air conditioning compressor from 2300 r/min to 2000 r/min to avoid from the rotation frequency of the cooling fan,the magnitude of the steering wheel vibration is reduced from 0.049 g to 0.015 g.At the same time,by increasing the bushing stiffness of the bracket structure to raise the rigid modal frequency,the basic frequency of 5000 r/min of the air conditioning compressor can be avoided so that the magnitude of steering wheel vibration is reduced from 0.178 g to 0.029 g and the magnitude of seat rail vibration is reduced from 0.013 g to 0.006 g.This control strategy has solved the problem of obvious vibration of the vehicle in the idling and air-conditioning condition,and has provided a guideline for setting the modal and frequency of the air conditioner systems.