矩形共振腔截面纵横比对其共振频率影响研究

亥姆赫兹共振腔具有良好的低频消声性能,被广泛地应用于低频消声方面.在实际应用中,共振腔的使用往往受到安装空间的限制,有时候只能安装矩形腔.利用定体积定长度时的矩形共振腔模型,从理论上探讨了腔体纵横比对共振腔共振频率的影响.同时设计了发动机进气消声器性能测试专用实验台,从实验角度研究了腔体截面纵横比与共振频率之间的关系.理论与实验初步结果表明,在算例条件下截面纵横比对共振频率影响不大,在应用时可以不考虑纵横比问题.所讨论内容对其它条件下的研究有借鉴作用.

The Research on Effect of Rectangular Resonator Sectional Aspect Ratio to Resonant Frequency

Helmholtz resonator has a good noise eliminating performance at low frequency.So it has been widely used on low frequency noise reduction.The usage of Helmholtz resonator is restrained by the space, which is only available for rectangular resonator somewhile. The paper stated the theory of rectangular resonator model of certain volume and length, and discussed the influence of aspect ratio of resonator section. Meanwhile,a specialized engine intake silencer and exhaust silencers test bench was designed to testify the relationship between aspect ratio and resonant frequency. It is showed that the aspect ratio has a tiny influence on the resonant frequency under the condition in the paper, so it need not to be taken into account. It should be pointed out that the research method also can do under other conditions.