面向动力总成噪声优化的动力吸振器和前围隔声性能的综合研究

Study of Dynamic Vibration Absorber and Dashboard Sound Insulation Performance for Powertrain Noise Optimization

摘要: 某量产SUV车型售后客户抱怨中，发动机噪声大为核心问题，严重影响车内乘坐舒适性。本文通过竞品车型主客观对比分析，结合发动机噪声主要传递路径解析方法，确定变速箱端悬置结构传递和防火墙辐射噪声隔离为核心优化路径；通过在变速箱端悬置增设动力吸振器降低结构传递噪声，同时优化防火墙材料密度提升隔声性能，两种措施综合实施后，样件装车验证显示，发动机1500~5000 rpm全频段噪声改善效果显著，彻底解决了客户抱怨的噪声问题。

Abstract: In the after-sales customer complaints of a mass-produced SUV model, excessive engine noise is a core problem, which seriously affects the ride comfort in the car. Through the subjective and objective comparative analysis of competitive vehicles and combined with the analysis method of the main transmission path of engine noise, this paper determined the gearbox end mount structural transmission and firewall radiation noise isolation as the core optimization paths. The structural transmission noise was reduced by adding a dynamic vibration absorber to the gearbox end mount, and the sound insulation performance was improved by optimizing the material density of the firewall. After the comprehensive implementation of the two measures, the sample vehicle loading verification showed that the noise improvement effect of the engine in the full frequency band of 1500~5000 rpm was significant, which completely solved the noise problem complained by customers.