带旁通的管道中的声能流及传声损失——Ⅰ：理论分析

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国家自然科学基金资助项目

Acoustic energy flux and transmission loss in a duct with a by-pass, portⅠ: theoretical analysis

摘要: 本文在平面波条件下，利用管道分叉点上声压和质点体积速度的连续性，导出了带旁通的管道中的声能流及其传声损失方程，在微机上作了数值计算，计算结果具体例证了声能环流的存在以及传声损失的频率特性，并且从有源噪声控制的角度对结果作了讨论.

Abstract: Equations of acoustic energy flux and transmission loss in a duct with a by-pass are derived from the continuities of sound pressure and volume velocity of particles at the joints of the duct and the by-pass,assuming all the sound waves considered here are plane ones. Computation results on a ndcrocomputor show that acoustic energy circulation exists in certain frequencies for a given duct. Transmission losses of 4 duct configuratfons are also presented and explained from the vieWPoint of active noise control.