某车型防火墙总成隔声性能的优化改进

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摘要： 前围内隔音垫是汽车防火墙总成的重要隔音部件，研究了不同的前围内隔音垫材料、覆盖率、软层厚度分布、过孔本体隔声、附件安装工艺特征等对防火墙总成隔声性能的影响。通过选取合适的材料组成及软层厚度、提高隔音垫覆盖率、提高过孔本体隔声、降低泄漏量等手段实现对某车型防火墙总成隔声性能的优化改进。

关键词：防火墙总成 隔声量 前围内隔音垫

中图分类号：U463.82   文献标志码：B   DOI： 10.19710/J.cnki.1003-8817.20240227

Optimization and Improvement of Sound Insulation Performance

of Firewall Assembly of A Vehicle Model

Liu Xiuying， Wang Yu， Huang Zhonghua， Song Jianxin， Zhu Lin， Zhao Fei

（Foton Research & Development Institute， Beijing 102206）

Abstract： The inner-dash sound insulation pad is an important part of the automobile firewall assembly. This paper studies the influence of different sound insulation pad materials， coverage rate， thickness distribution of soft layer and installation process characteristics of accessories on the sound insulation performance of the firewall assembly. The sound insulation performance of the firewall assembly of a vehicle model is optimized and improved through selecting appropriate material composition and soft layer thickness， improving the coverage rate of the sound insulation pad， and reducing the leakage amount.

Key words：  Firewall assembly， Sound insulation， Inner-dash sound insulation pad

1 前言

汽车的振动噪声性能直接影响消费者的用车体验，因此，主机厂在噪声、振动与声振粗糙度（Noise、Vibration、Harshness，NVH）方面的研发投入日益增加，有统计资料显示[1]，各主机厂有近20%的研发费用用于解决NVH问题。（剩余4883字）