某轻型汽车排气波纹管异响问题分析和方案优化
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摘要
某款轻型汽车排气波纹管在特殊工况条件下存在异响的现象,针对该问题进行了确认、排查及试验验证,分别分析了系统共振、波纹管结构摩擦、整车装配误差过大等因素对异响的影响,表明产生异响的主要原因为波纹管动刚度峰值频率与发动机激励频率、排气系统固有模态重合进而导致共振发生,异响来源为波纹管外网结构摩擦以及整车装配误差。提出了波纹管优化方案且进行了试验和验证,结果表明,通过更改波纹管外网结构、增加其最大极限位移、改变波纹管动刚度特性可以有效解决异响问题。
Abnormal noise in the exhaust bellow of a light duty vehicle under special working conditions has been confirmed, troubleshooted and verified by experiments. The influence of three factors including sympathetic vibration,bellow structural friction and vehicle assembly error on abnormal noise was analyzed. The analysis results show that the abnormal noise is mainly caused by superposition between bellow dynamic stiffness peak frequency and engine excitation frequency as well as exhaust system intrinsic mode that causes resonance, abnormal noise comes from bellow structural friction and vehicle assembly error. Bellow optimization was proposed, tested and verified. The results show that the abnormal noise can be eliminated by changing bellow external structural, increasing its maximum ultimate displacement and changing bellow dynamic stiffness.
Abnormal noise in the exhaust bellow of a light duty vehicle under special working conditions has been confirmed, troubleshooted and verified by experiments. The influence of three factors including sympathetic vibration,bellow structural friction and vehicle assembly error on abnormal noise was analyzed. The analysis results show that the abnormal noise is mainly caused by superposition between bellow dynamic stiffness peak frequency and engine excitation frequency as well as exhaust system intrinsic mode that causes resonance, abnormal noise comes from bellow structural friction and vehicle assembly error. Bellow optimization was proposed, tested and verified. The results show that the abnormal noise can be eliminated by changing bellow external structural, increasing its maximum ultimate displacement and changing bellow dynamic stiffness.
引文
[1]苏世荣,周伟.某车型整车噪声源识别与优化试验研究.汽车技术, 2017(5):41-44.
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[3]陆荣英,姚怡静,王伟伟.某MPV车型急加速异响问题分析与解决.装备制造技术, 2016(4):178-179.
[4]胡张杰,谭丕强,小山顺平.汽车排气系统挠性管总成的优化设计.内燃机, 2016(2):20-23.
[5]熊永华,杜发荣,钟玉平.金属波纹管的动态特性分析与振动试验研究.中国机械工程, 2008, 19(10):1176-1180.
[6]李德堡,陆秋海.实验模态分析及其应用.北京:科学出版社, 2001.
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[2]贺强,黄家城,李文勇.汽车排气系统波纹管性能试验分析和改进设计.装备制造技术, 2015(4):12-15.
[3]陆荣英,姚怡静,王伟伟.某MPV车型急加速异响问题分析与解决.装备制造技术, 2016(4):178-179.
[4]胡张杰,谭丕强,小山顺平.汽车排气系统挠性管总成的优化设计.内燃机, 2016(2):20-23.
[5]熊永华,杜发荣,钟玉平.金属波纹管的动态特性分析与振动试验研究.中国机械工程, 2008, 19(10):1176-1180.
[6]李德堡,陆秋海.实验模态分析及其应用.北京:科学出版社, 2001.
[7]何竹革,胡光辉.汽车排气波纹管耐久性优化设计.客车技术与研究, 2015(4):24-26.