翟旭茂^1,2，解现龙^1,2，文志永^1,2，田新伟^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：某校车在加速工况下驾驶室内出现异响，严重影响整车舒适性。通过主观评价、频谱特征分析、声学互动滤波法的应用，实现对异响频率成分的确认。再通过综合运用铅包裹法、近场测量法等噪声源识别方法，确定该异响源为整车排气弹性连接管，通过优化弹性连接管结构解决了异响故障，最终达到有效改善车内声品质，提高整车NVH性能的目的，对其它异响故障排查及排气管路设计有较大参考价值。

关键词：校车；异响；弹性连接管；NVH

Abstract：An abnormal noise in front of a school bus appeared when it accelerated rapidly, which negatively affected the comfort of passengers. Methods, such as subjective evaluation, spectrum analysis and acoustic interactive evaluation, were utilized to analysis the components of the abnormal noise frequency. Noise sources identification methods, such as lead wrap, near field measurement and so on were used to identify the abnormal noise sources. It was identified that the noise was generated by the flexible pipe of the vehicle. By optimizing the structure of the flexible pipe, the problem of the abnormal noise was solved, the interior sound quality and the NVH performance of the vehicle were improved.

Key words：school bus;abnormal noise;flexible pipe; NVH