丁保安^1,2，邬忠永^1,2，李秀山^1,2，郭彬^1,2，张伟龙^1,2，郭凯^1,2

（1.内燃机可靠性国家重点实验室，山东 潍坊 261061；2.潍柴动力股份有限公司，山东 潍坊 261061）

摘要:某客车70km/h出现轰鸣噪声，严重影响乘坐舒适性。通过声振测试和声学仿真方法对轰鸣原因进行研究，确定轰鸣噪声是传动轴激励频率与车内声腔模态频率耦合引起。通过优化传动轴的剩余不平衡量，降低传动轴激励，消弱车内声振耦合作用。试验结果表明，车内轰鸣噪声得到明显改善，A计权声压级降低了1.45dB（A），C计权声压级降低了6.77dB（C）。

关键词:轰鸣；声腔模态；传动轴；动平衡

Abstract：Booming noise appeared inside a bus at the speed of 70km/h, which seriously affected the comfortability of passengers. The booming phenomenon was studied by noise-vibration test and acoustic simulation method. It was determined that the booming noise was caused by the coupling of the drive shaft excitation frequency and acoustic cavity modal of the bus interior space. The coupling effect of the acoustics and vibrations was weakened by optimizing the residual unbalance of the drive shaft and reducing driving shaft excitation. The test results showed that the booming noise was reduced significantly. The A-weighted sound pressure level was reduced by 1.45 dB(A), and the C-weighted sound pressure level was reduced by 6.77 dB(C).

Key words：booming；acoustic cavity modal；drive shaft；dynamic balance