内前围隔音垫隔声性能研究

PDF(1305 KB)

振动与冲击 ›› 2018, Vol. 37 ›› Issue (7) : 254-258.

论文

内前围隔音垫隔声性能研究

罗竹辉?，贺才春，罗仡科，周熙盛，颜猛，郭福林

作者信息 +

Sound insulation performance of vehicle inner-dash insulators

LUO Zhu-hui , HE Cai-chun , LUO Yi-ke, ZHOU Xi-sheng, YAN Meng, GUO Fu-ling,

Author information +

文章历史 +

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实验测试结果在315Hz~2000Hz频率范围内相差0.5~2dB，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2.5mm，PU材料密度选取50kg/m3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。

Abstract

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 0.5dB~2dB within the frequency range of 315Hz ~ 2000Hz, 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 2.5mm and PU density of 50kg/m3 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. .

导出引用

罗竹辉?，贺才春，罗仡科，周熙盛，颜猛，郭福林. 内前围隔音垫隔声性能研究[J]. 振动与冲击, 2018, 37(7): 254-258

LUO Zhu-hui,HE Cai-chun,LUO Yi-ke, ZHOU Xi-sheng, YAN Meng, GUO Fu-ling,. Sound insulation performance of vehicle inner-dash insulators[J]. Journal of Vibration and Shock, 2018, 37(7): 254-258

参考文献

[1] Jain S K, Shravage P, Joshi M, et al. Acoustical Design of Vehicle Dash Insulator[J]. Sae Technical Papers, 2011.
[2] Moritz C T, Kleckner J A, Saha P. Development of Quiet Sound Package Treatments for Class 8 Trucks[J]. 2001.
[3] Musser C T. Sound Package Performance, Weight, and Cost Optimization Using SEA Analysis[J]. 2003.
[4] Zhang J, Pang J, Zhang S, et al. A Lightweight Dash Insulator Development and Engineering Application for the Vehicle NVH Improvement[C]// SAE 2015 Noise and Vibration Conference and Exhibition. 2015:432-433.
[5] 邓江华. 防火墙总成特性对汽车声学包性能影响[J]. 噪声与振动控制, 2014(3):78-81.
DENG Jianghua. Effect of firewall assembly on vehicle sound-package performance[J].Noise and Vibration Control , 2014(3):78-81.
[6] 丁政印, 郝志勇, 张智博. FE-SEA法对镁合金前围板声传递路径识别与声学包装设计[J]. 振动与冲击, 2014(10):87-91.
DING Zhengyin,HAO Zhiyong,ZHANG Zhibo. Sound transmission path identification of a magnesium-alloy dash board with FE-SEA method and its sound package design[J].Journal of Vibration and Shock, 2014(10):87-91.
[7] Nyre L. Propagation of Sound in Porous Media: Modelling Sound Absorbing Materials 2e -, Noureddine Atalla[J]. 2013.
[8] Shravage P, Bonfiglio P, Pompoli F. Hybrid inversion technique for predicting geometrical parameters of porous materials[J]. Journal of the Acoustical Society of America, 2008, 123(5):3284-3284.
[9] 马大猷. 噪声与振动控制工程手册[M]. 机械工业出版社, 2002.
[10] 钟祥璋, 朱子根. 轻薄板墙中夹芯材料对隔声性能的影响[J]. 电声技术, 2012, 36(12):1-5.
ZHONG Xiangzhang, ZHU Zigen. The effect to sound insulation performance of a light panel partition by sandwich material[J]. Audio Engineering, 2012, 36(12):1-5.
[11] 陈鑫. 基于SEA方法的轿车车内噪声分析与控制研究[D]. 吉林大学, 2008.
[12] 刘成武. 基于混合FE-SEA法的镁质油底壳隔声数值优化[J]. 现代制造工程, 2014(11):43-46.
LIU Chengwu. Numerical optimization of Mg-based oil pan transmission loss based on hybrid FE-SEA method[J]. Modern Manufacturing Engineering, 2014(11):43-46.