某车辆滑行工况排气系统引起的车内轰鸣声研究  

Study on Exhaust System Induced Interior Booming Noise under Vehicle’s Coast-down Condition

作　　者：齐钢[1] 朱廉洁[1] 赵玉才[1] 邱群麟[1] 刘湃[1] QI Gang;ZHU Lianjie;ZHAO Yucai;QIU Qunlin;LIU Pai(Chassis Engineering Department,Pan Asia Technical Automotive Center,Shanghai 201208,China)

机构地区：[1]泛亚汽车技术中心有限公司底盘工程部,上海201208

出　　处：《噪声与振动控制》2020年第5期172-174,198,共4页Noise and Vibration Control

摘　　要：依据NVH源、传递路径到响应点的研究准则,从系统集成的角度对某车辆滑行工况下的车内轰鸣声加以研究。结果表明滑行工况下的车内轰鸣声主要由排气尾管2阶噪声与车辆空腔模态耦合所致,且滑行工况下自动变速箱降档策略使发动机转速频繁经过问题转速点从而加剧问题发生的频次。采用矩形管道声学传播理论可以快速近似计算出车辆的前几阶声腔模态频率,有利于问题原因快速排查;在排气系统设计上采用赫姆霍兹共振腔结构来降低源头的激励解决车内轰鸣声抱怨也是一项经济有效的措施。The vehicle interior booming noise under coast down condition was studied from the system integration perspective based on NVH study principle from source,transfer path to receiver.The results show that under coast down condition the interior booming noise is induced by the 2nd order noise of the exhaust tailpipe coupled with the vehicle cavity modal.Due to special auto transmission down shift calibration strategy,engine speed frequently shifts back and forth across the problem engine speed,which degrades the problem.Using the theory of acoustic propagation in rectangular duct can rapidly and approximately calculate the low frequencies of the previous orders of the vehicle cavity mode,which is beneficial for problem identification.From the perspective of noise source reduction,the Helmholtz resonator is used in the exhaust system design to solve the interior booming noise problem,which is one of the effective and economical measures.

关 键 词：声学 车内轰鸣声 车辆空腔模态 赫姆霍兹共振腔 排气消声器设计 系统集成 

分 类 号：TB535[理学—物理] TK421.6[理学—声学]