共振式消声器消声性能的数值模拟

Numerical Simulation of Noise Attenuation Performance of the Resonant Silencer

为研究结构参数对共振式消声器消声性能的影响规律,利用基于三维有限元分析的三点法,分别对不同共振腔形状、不同共振腔体积、不同连接管、不同主管道的消声器进行数值模拟分析.结果表明:共振腔长径比对消声性能有很大影响,当长径比为0.3时,共振频率最大,随长径比增减,共振频率均向低频方向移动;共振腔体积及连接管尺寸既影响共振频率变化规律,又影响传声损失及消声带宽的变化规律;主管道直径对消声器共振频率及传声损失影响不大,但对消声带宽有很大影响.

In order to study the influence of structural parameters on the noise attenuation performance of the resonant silencer ,transmission loss numerical simulation for different cavity shapes ,cavity volumes , connection pipes and main pipelines is carried out with the three‐point method based on the three‐dimen‐sional finite element analysis .The result shows that the length‐to‐diameter ratio of the cavity has great in‐fluence on noise attenuation performance .When the ratio equals to 0.3 ,the resonant frequency reaches the maximum value .With the increase or decrease of the length‐to‐diameter ratio ,the resonant frequency is lower .Cavity volume and connection pipe size influence not only the changing regularity of the resonant frequency but also the changing regularity of transmission loss and noise bandwidth .The diameter of the main pipe has but a slight influence on the resonant frequency and transmission loss ,but has a great influ‐ence on the noise bandwidth .