Acoustic attenuation performance of circular expansion chambers with extended inlet outlet
Acoustic attenuation performance of circular expansion chambers with extended inlet outlet
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DOI：
10.1006/jsvi.1998.2138
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发表时间：
1999-06-03
影响因子：
4.7
通讯作者：
Ji, ZL
中科院分区：
文献类型：
--
作者：
Selamet, A;Ji, ZL
研究了具有扩展入口/出口的圆形膨胀室的声衰减性能。采用三种方法来确定传输损耗：（1）同心配置的二维轴对称解析解； (2)基于子结构边界元-传递阻抗矩阵技术的三维计算解； (3)对具有扩展室的扩展阻抗管装置进行实验，该扩展室具有固定的入口、出口和室直径，以及扩展管道和室的不同长度以及入口和出口的不同偏移位置。所有三种方法的传输损耗结果与同心配置非常一致。该计算方法还应用于确定具有扩展入口/出口的不对称膨胀室的声衰减性能，这也与实验进行了很好的比较。详细讨论了几何形状（延伸管道和膨胀室的长度以及不对称配置的偏移角）对多维波传播和声衰减性能的影响。 (C) 1999 年学术出版社。
The acoustic attenuation performance of circular expansion chambers with extended inlet/outlet is investigated. Three approaches are employed to determine the transmission loss: (1) a two-dimensional, axisymmetric analytical solution for the concentric configuration; (2) a three-dimensional computational solution based on the substructure boundary element-transfer impedance matrix technique; and (3) experiments on an extended impedance tube set-up with expansion chambers fabricated with fixed inlet, outlet, and chamber diameters, and varying lengths for the extended ducts and the chamber, and varying offset locations of the inlet and outlet. The transmission loss results from all three approaches are shown to agree well for the concentric configurations. The computational approach is also applied to determine the acoustic attenuation performance of asymmetric expansion chambers with extended inlet/outlet, which also compares well with the experiments. The effect of geometry (lengths of the extended ducts and expansion chamber, and the offset angles of the asymmetric configuration) on the multidimensional wave propagation and acoustic attenuation performance is discussed in detail. (C) 1999 Academic Press.