• CN:11-2187/TH
  • ISSN:0577-6686

›› 2010, Vol. 46 ›› Issue (24): 96-100.

• 论文 • 上一篇    下一篇

车身板件振动声学贡献分析与优化

赵静;周鋐;梁映珍;麻海舰   

  1. 同济大学汽车学院
  • 发布日期:2010-12-20

Vehicle Body Panel Acoustic Contribution Analysis and Optimization

ZHAO Jing;ZHOU Hong;LIANG Yingzhen;MA Haijian   

  1. College of Automotive Engineering, Tongji University
  • Published:2010-12-20

摘要: 以某型面包车为例,引入频率准则以及模态置信度准则的概念,通过白车身模态试验验证结构有限元模型正确性;在结构有限元模型上选择发动机悬置位置作为力激励点,通过模态叠加法得到结构振动响应;并以此作为声学边界元模型的边界条件,计算得到车内某点的声灵敏度曲线;根据实车怠速工况下车内声压以及发动机悬置振动响应分析结果,找出相应的车内声压响应峰值频率作为作板件贡献分析,确认贡献显著的板件;以整车半消声室为试验环境,在实车上对相应板件进行约束阻尼处理进行验证,试验结果表明,车内声压在对应峰值位置有较明显的下降。

关键词: 模态, 模态叠加, 模态置信度, 声学, 声学贡献度, 声学灵敏度, 阻尼

Abstract: The structure finite element model is verified by the modal test of vehicle body in white in frequency domain and also by Modal Assurance Criterion; The engine mounts are chosen as the force impact points and then the structure vibration responses, which function as the boundary condition of the acoustic boundary element model, are acquired through the mode superposition method. Then the acoustic response of the certain position in vehicle cavity is calculated. According to the test results of actual SPL and the vibration responses of the engine mounts in idling condition, panel contribution analysis method is used to identify the panel with significant contribution, which serves as the basis to determine the position of damp treatment. The validation test of damp treatment shows a great decrease of peak value of the SPL.

Key words: Acoustic contribution, Acoustic senstivity, Acoustics, Damp, Modal assurance criterion, Mode, Mode superposition

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