共振式消声器声学性能分析

在保持连接管结构形状及尺寸不变、共振腔容积不变的条件下，分析了单节共振式消声器腔体结构对其声学特性的影响。结果表明；共振式消声器腔体深宽比对其共振频率有较大的影响，截面宽高比有一定的影响，但相对较小。当腔体形状接近于立方体时，消声器共振频率最大，此时用集中参数模型估算消声器共振频率与实际值偏差最小，腔体深宽比减小或增大，共振频率均向低频方向移动，当腔体深度大于波长的10％～16％时，用一维轴向模型估算消声器共振频率与实际值吻合较好；随着截面宽高比的增加，消声器共振频率向低频方向移动，截面形状愈扁，共振频率变化幅度愈大。

Analysis of Acoustic Performance of the Resonant Silencer

The effects of geometry of the resonator cavity on the acoustic performances of a single joint resonant silencer with fixed neck geometry and cavity volume have been studied. The results show that the depth to width ratio of the cavity has a significant effect on transmission loss characteristics, the length-to- width ratio of the cavity cross-section has a little effect also. The resonance frequency reaches a maximum as the silencer cavity is an approximate cubical, the predicted resonance frequency using the classical lumped pa- rameters formula has the smallest deviation from the real value, and an increase or decrease in the volume depth-to-width ratio reduces the primary resonance frequency. When the depth-to-width ratio is bigger than 10%-16% wavelength, the resonance frequency calculated by one-dimensional analytical formula coincides quietly with the real value. An increase in the length-to-width ratio of the cavity cross-section reduces the resonance frequency and the more flat the cross-section shape becomes, the more the resonance frequency changes.