共振型进气消声器腔体尺寸对其共振频率影响研究

亥姆赫兹共振腔结构简单,且有良好的低频消声性能,近几年来广泛地应用于发动机进排气消声上.由于其消声有效带宽很窄,共振频率的精确确定直接关系到消声器能否有效消声,但是通常所采用的集中参数模型有时候会失效.建立了共振腔型消声器一维轴向声传播模型,揭示了圆形旁支型共振进气消声器的消声机理.同时对连接管长度的修正问题做了阐述,得出了共振腔一维轴向传播模型共振频率的计算公式.此外,设计了发动机进气消声器性能测试专用实验台,从实验角度研究了共振频率与腔体尺寸之间的关系.撰写为正确设计亥姆赫兹共振腔型进气消声器提供一个重要方法.

The Research on Resonator Parameters Affect on Resonant Frequency of Helmholtz Resonant Intake Silencer

Helmholtz resonator has a simple configuration,but it has a good noise eliminating performance at low frequency.So it hs been widely used on the engine intake and exhaust noise reduction.As the effective bandwidth is narrow,it is important to predict the resonant frequency accurately.But the lumped parameter model is inoperative in some cases.This paper build an one dimensional axial propagating model for Helmholtz resonator,and the noise eliminating mechanism has been revealed.At the same time,the length of connector of resonator has been discussed,and a synthetic equation of calculating resonant frequency has been put forward.Moreover,a specialized engine intake silencer and exhaust silencers test bench was designed,and the tests and analysis are performed as well.The paper has provided an important method for Helmholtz resonant intake silencer design.