基于路面激励噪声的车身NVH性能优化

相象文¹，张国宁²

1.安徽交通职业技术学院，安徽 合肥  230051；2.浙江吉利汽车研究院有限公司，浙江 宁波  315336

摘要：为解决某轿车样车在粗糙沥青路面激励作用下车内出现噪声的问题，分析路面激励的传递路径，采用计算机辅助工程（computer aided engineering，CAE）软件对整车模型进行有限元仿真，分析引起车内噪声的主要结构板件。通过在后备箱置物板上加装加强板、敷设阻尼材料的方法优化车身结构，进行CAE测试与实车试验。结果表明：后备箱置物板加装加强板和敷设阻尼材料能明显降低由路面激励引起的车内低频噪声和高频噪声，可以实现车身振动、噪声和声振粗糙度（noise，vibration，harshness，NVH）性能优化。

关键词：路面激励；有限元仿真；NVH；实车试验

NVH performance optimization of car body based onroad excitation noise

XIANG Xiangwen¹，ZHANG Guoning2

1.Anhui Communications Vocational and Technical College, Hefei 230051, China;

2.Zhejiang Geely Automobile Research Institute Co.,Ltd., Ningbo 315336, China

Abstract:The transfer path of road excitation is investigated, and CAE software is used for finite element simulation of vehicle model, which is found out the main structural plate causing interior noise of sample car under the action of road excitation in rough asphalt pavement. The structure of car body is optimized by adding reinforcement panel on the trunk shelf and laying damping materials, and CAE test and real vehicle test is carried out. The results show that adding reinforcement panel on the trunk shelf and laying damping materials can significantly improve low and high frequency noise inside the car caused by road excitation, so as to carry out optimize the NVH performance of the car body.

Keywords:road excitation; finite element simulation; NVH; real vehicle test