【摘要】 本文着重分析研究管道结构中含同轴穿孔管时的声传播特性，借助成熟的管道声学理论对典型结构作了严格的分析。阐明了结构内存在两种类型声波：一为普通的平面声波，声压的相位和振幅在穿孔管内外区域保持相同；另一为特殊的声波，它由于穿孔管壁的耦合作用而产生，其声压的相位在内外区域正好相反，而振幅与截面积成反比，并且波数也与平面波的波数有所不同。文中对含同轴穿孔管的一些典型结构，作了定量分析，导出了进口界面上声阻抗的精确计算公式，可为实用设计提供可靠的理论依据更多还原

【Abstract】 In this paper, acoustical property of the tubular structure containing perforated coaxial pipe is investigated rigorously based upon well developed sound propagation theory.It is shown there are two different kinds of sound wave:One is the common plane wave.The other is special one caused by coupling effect of the perforated pipe.The formulas to determine the acoustic impedance at the inlet of typical structures are derived and discussed.更多还原