并排式共振消声器声学特性分析及试验研究

Analysis and Experimental Study on Acoustic Characteristics of Parallel Resonant Mufflers

针对赫姆霍兹共振式消声器消声有效带宽很窄,在实际应用中需要在进排气系统中布置多个共振式消声器消除不同频带噪声,但噪声控制的消声器数量受空间限制的问题,提出了一种新型并排式多腔赫姆霍兹共振消声器结构设计方法并进行性能验证。将多个不同频率的共振腔并排式布置在管道同一截面,采用有限元方法分析消声器传递损失,仿真结果表明,并排式共振腔能够互不干涉,有效地消除多个不同频率处噪声值,且占用空间小,消声效率高。通过传递损失试验验证了仿真结果的准确性,并将其应用于进气系统消声设计中,取得了良好的降噪效果。

Due to the narrow effective bandwidth of the Helmholtz resonant muffler,multiple resonant muffler is required to be installed in the intake and exhaust system for eliminating the noise in different frequency bands.Practically,the number of mufflers is spatially restricted.A novel structural design based on parallelly arranged Helmholtz resonant mufflers is developed in this paper.The transmission loss of the noise in the parallelly arrange mufflers has been obtained using finite element method.The results show that there is no interferences between the paralleled mufflers,and the developed structure effectively eliminate the noise at different frequencies while occupying less space.The accuracy of the simulation results is verified by transmission loss test.This design achieves excellent noise reduction when it is applied to the intake system.