内前围隔音垫隔声性能研究  

Sound insulation performance of vehicle inner-dash insulators

作　　者：罗竹辉[1] 贺才春[1] 罗仡科[1] 周熙盛[1] 颜猛[1] 郭福林[1] LUO Zhuhui;HE Caichun;LUO Yike;ZHOU Xisheng;YAN Meng;GUO Fulin(Zhuzhou Times New Material Technology Co.Ltd.,Zhuzhou 412007,China)

机构地区：[1]株洲时代新材料科技股份有限公司,湖南株洲412007

出　　处：《振动与冲击》2018年第7期254-258,共5页Journal of Vibration and Shock

基　　金：湖南省科技计划重点项目(2014WK2036)

摘　　要：发动机噪声是汽车主要噪声源,内前围隔音垫是发动机噪声向乘员舱传递路径中最重要的声学零部件。参照混响室-消声室法隔声测试原理,在LMS Virtual.lab中建立EVA+PU形式的内前围隔音垫平面件隔声性能仿真分析计算模型,仿真分析计算结果与试验测试结果在315~2 000 Hz频率范围内相差0.5~2.0 dB,总体满足工程要求。利用仿真分析方法和模型,对12种内前围隔音垫隔声结构的隔声量进行了计算,并计算了隔声效率,结果显示EVA厚度选取2.5 mm,PU材料密度选取50 kg/m^3时,隔声效率最大,可作为内前围隔音垫隔声结构的设计方案,内前围零件隔声量实验测试结果验证了这一结论。Engine noise is the main noise source of passenger cars.Inner-dash insulator plays a very important role in obstructing engine noise transmission from engine to passenger compartment.According to the sound insulation test principle of insulation material using the reverberant room-anechoic room method,a simulation analysis calculation model for sound insulation performance of inner-dash insulators with EVA layer and PU one was built in LMS Virtual.lab.It was shown that the difference between the simulated results and test ones is 0.5 dB-2 dB within the frequency range of 315 Hz-2 000 Hz,the simulated results meet engineering requirements.Using the simulation analysis method and model,sound insulation values and sound insulation efficiencies of 12 types of inner-dash insulators were computed.The results showed that the insulator with EVA thickness of 2.5 mm and PU density of 50 kg/m 3 has the maximum sound insulation efficiency;this insulator can be taken as the optimal design scheme of inner-dash insulators.This conclusion was verified with sound insulation test results of inner-dash insulators.

关 键 词：内前围隔音垫 隔声性能 隔声效率 乙烯-醋酸乙烯共聚物 

分 类 号：U461.4[机械工程—车辆工程]