车内某高频噪声的分析和优化控制
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摘要
针对某柴油皮卡车型在急加油门时出现的高频噪声,利用声学滤波技术确定其噪声能量主要分布在9000～1400 Hz频段。采用近场声学测试、声振频谱分析等方法锁定噪声源来自废气再循环冷却器。通过理论分析和计算流体动力学数值仿真技术,研究了该废气再循环冷却器波纹管处介质流场情况,流场的不均匀性和大涡流是辐射高频噪声的主要原因。仿真分析显示优化设计后该高频噪声得到明显改善,最后通过整车实验验证,结果显示优化效果良好。
A high frequency noise in pickup's cab was studied in this paper. In order to diagnose the problem,filtering technology was used. The noise frequency is mainly between 9000 to 14000 Hz. After finishing the near field acoustic test and acoustic & vibration spectrum analysis test, it's confirmed that the noise came from the exhaust gas recirculation(EGR) cooler. Flow distribution inside the bellows of EGR cooler was studied by numerical investigation. Fluid flow maldistribution and maelstrom are the causes of this noise problem.Simulation shows this high frequency noise is improved by optimized design. Vehicle test and subjective assessment show that optimization is effective in the end.
A high frequency noise in pickup's cab was studied in this paper. In order to diagnose the problem,filtering technology was used. The noise frequency is mainly between 9000 to 14000 Hz. After finishing the near field acoustic test and acoustic & vibration spectrum analysis test, it's confirmed that the noise came from the exhaust gas recirculation(EGR) cooler. Flow distribution inside the bellows of EGR cooler was studied by numerical investigation. Fluid flow maldistribution and maelstrom are the causes of this noise problem.Simulation shows this high frequency noise is improved by optimized design. Vehicle test and subjective assessment show that optimization is effective in the end.
引文
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[2]杨文英,郝志勇,郑旭,等.轴系扭振诱发的车内异响诊断及优化[J].振动、测试与诊断,2018,38(2):401-406,426.
[3]韩昌,张文,尹婧.车用发动机排气波纹管异响问题的试验研究[C]//2013中国汽车工程学会年会论文集,2013:1389-1394.
[4]周华程,陈柄林,Purania Narendra,等.消声金属网降低低压EGR系统噪声的仿真研究[J].小型内燃机与车辆技术,2017,46(3):66-69.Zhou Huacheng,Chen Binglin,Purania Narendra,et al.Simulation research on using the noise prevention metal net to reduce the LP-EGR system noise[J].Small Internal Combustion Engine and Motorcycle,2017,46(3):66-69.
[5]陈正翔,李春祥,江松青,等.波纹管壳结构中振动波的传播[J].振动工程学报,2000,13(4):567-576.Chen Zhengxiang,Li Chunxiang,Jiang Songqing,et al.Propagation of vibration wave in cylindrical shell with sinusoidally perturbed wall[J].Journal of Vibration Engineering,2000,13(4):567-576.
[6]田亚莉.基于降噪的汽车进气波纹管基础研究[D].秦皇岛:燕山大学,2006.
[7]谢溪凌,陈燕毫,刁建超,等.波纹管-黏滞流体隔振器特性与实验[J].噪声与振动控制,2017,37(4):201-205,230.Xie Xiling,Chen Yanhao,Diao Jianchao,et al.Experiment of an isolator fabricated with diaphragm bellows and viscous fluid[J].Noise and Vibration Control,2017,37(4):201-205,230.
[8]刘永刚,司东宏,马伟,等.流固耦合下含夹层阻尼的多层金属波纹管刚度和阻尼研究[J].机械工程学报,2014,50(5):74-81.Liu Yonggang,Si Donghong,Ma Wei,et al.Research on stiffness and damping of sandwich damping metal bellows considering fluid-solid interaction[J].Journal of Mechanical Engineering,2014,50(5):74-81.
[9]庞剑,谌刚,何华.汽车噪声与振动--理论与应用[M].北京:北京理工大学出版社,2006.