摘要
为了降低冷却风扇对车内噪声的影响,采用理论分析与实车试验相结合的方法,在分析"拍振"机理的基础上讨论了双冷却风扇"拍振"形成的原因;以某B级车车内噪声为研究对象,进行了双冷却风扇优化前后的对比试验.研究结果表明:当转速差较小时,双冷却风扇因各自动不平衡引起的两个振动会合成"拍振",影响车辆舒适性;实测车内噪声含明显的冷却风扇噪声成分,且"拍振"现象明显;通过调整两冷却风扇转速差到20%和减小动不平衡量10%,发动机怠速、冷却风扇高速运转时车内噪声由优化前48.32dB(A)降低至46.86 dB(A),降噪效果明显.
In order to reduce interior noise caused by cooling fan, mechanism of beat vibration of double cool- ing fans was discussed with help of theoretical analysis and field test. The comparison tests of prototype were carried on direct to the double cooling fans with and without optimizations. It was pointed that beat vibration was caused by double cooling fans with unbalance mass and little difference in rotating speed, which affected the comfort of the vehicle. The interior noise has close relationship with noise of cooling fan and beat vibration of noise was obvious. The interior noise of idle with high speed of cooling fans decreased from 48.32dB （A） without optimizations to 46.86 dB （A） with optimizations by adjusting the rotating speed difference of the double cooling fans to 20% and cutting unbalance mass by 10%.
出处
《郑州大学学报（工学版）》
CAS
北大核心
2013年第4期40-44,共5页
Journal of Zhengzhou University（Engineering Science）
基金
国家自然科学基金青年基金资助项目(51208044)
中国博士后科学基金面上资助项目(20100471592)
关键词
汽车工程
冷却风扇
拍振
噪声
舒适性
automotive engineering
cooling fan
beat vibration
noise
comfort
