乘用车冷却风扇拍振问题分析与解决
2021-06-20杨鹏李允陈兵张智仲崇发
杨鹏 李允 陈兵 张智 仲崇发



摘 要:针对乘用车怠速开空调工况产生的车内噪声“拍振”现象,本文根据拍振形成原理对问题声音进行分析,确定问题真因后,又建立了评价拍振问题程度的噪声指标,最后在不改变动力总成和车身总成的基础上,通过改善问题源和传递路径等手段,车内噪声拍振峰值平均降低5.4dB(A),主观评价结果7分,拍振问题得以解决,有效提升了怠速开空调工况的整车NVH体验,对由冷却风扇引起的车内噪声“拍振”问题的解决起到了关键性的作用。
关键词:冷却风扇;拍振;动平衡;硬度
中图分类号:U467.3 文献标识码:A 文章编号:1005-2550(2021)03-0041-06
Analysis And Solution of Beat Vibration Of Passenger Car
Cooling Fan
Yang Peng1,2 , LI Yun1,2 , Chen Bing1,2 , Zhang Zhi1,2 , Zhong Chong-fa1,2
(1.China FAW Group Co., Ltd, 130013; 2.State Key Laboratory of Comprehensive Technology on Automobile Vibration and noise & Safety Control, 130011,China)
Abstract: Aiming at the phenomenon of “beat vibration” in the interior noise of passenger car when the air conditioner is turned on at idle speed. In this paper, the problem sound is analyzed according to the principle of beat formation. After determining the true cause of the problem, a noise index is established to evaluate the degree of the problem. Finally, on the basis of not changing the powertrain and body assembly, by improving the problem source and transmission path, average reduction of interior noise beat peak value by 5.4dB (a), subjective evaluation results: 7 points. The beat vibration problem was solved. Effectively improve the vehicle NVH experience of idling on air conditioning condition. It plays a key role in solving the problem of interior noise beat caused by cooling fan.
Key Words: Cooling Fan; Flapping; Dynamic Balance; Hardness
杨 鹏
毕业于北京理工大学,学士学位,现就职于中国第一汽车股份有限公司研发总院NVH研究所,任动力单元冷却系统NVH开发员,研究方向为整车冷却系统NVH。
1 前言
近年来随着汽车产业的不断升级和发展,人均汽车消费额也日益增长,汽车逐渐由代步工具转变成为居家必备。据资料统计,截至2020年6月底,全国汽车保有量达2.7亿辆,同比去年涨幅约为8%;汽车驾驶人4亿人,同比去年涨幅约为5%。随着汽车产品日益丰富,消费者对于汽车性能,特别是NVH(Noise、Vibration、Harshness)性能要求也越来越高,同时冷却风扇作为汽车冷却系统最重要的组成部分之一,其NVH性能的提升工作也逐渐被各大主机厂以及零部件厂商提上日程,因此在产品开发过程中,如何快速而高效地解决由于冷却风扇引起的车辆NVH性能问题迫在眉睫。
2 冷却风扇作用及拍振现象描述……p>
