某汽油机排气隔热罩噪声仿真对比研究  

Noise Simulation Comparison and Research of One Gasoline Engine Exhaust Heat Shield

作　　者：崔宁[1] 胡昌良[1] 路明[1] 朱凌云[1] 邹凯[1] 章家续[1] 

机构地区：[1]安徽江淮汽车股份有限公司,安徽合肥230601

出　　处：《内燃机》2013年第3期41-43,共3页Internal Combustion Engines

摘　　要：基于Nastran的振动计算功能和LMS Virtual Lab.Acoustic的噪声计算功能,对两种不同材料的排气隔热罩进行振动噪声对比分析。分析显示,三层隔热罩(中间层是玻璃纤维)在中高频能很好地降低振动和噪声,其1 m噪声比单层隔热罩低2～6 dB(A)。通过CAE分析,可以为隔热罩设计提供方向性指导,并为现有机型的减振降噪提供参考。Based on function of Nastran vibration calculation and LMS Virtual Lab. Acoustic noise calculation, a comparative noise and vibration analysis of the exhaust heat shield with two different materials has been executed. The analysis result shows that： triple-layerheal shield （intermediale layer is glass fiber） can reduce vibration and noise in medium and high frequency band. The one meter noise of triple-layer heal shield is lower than that of single-layer heal shield, which up to 2 dB （A） to 6 dB （A）. CAE analysis can provide directions for heal shield design, and provide a rebrence for noise and vibration reduclion of the existing engine.

关 键 词：三层隔热罩 振动 噪声 边界元 有限元 

分 类 号：TK411[动力工程及工程热物理—动力机械及工程]