Excitation, transmission and radiation of sound from source distributions in hard-walled ducts of finite length (II): The effects of duct length
Excitation, transmission and radiation of sound from source distributions in hard-walled ducts of finite length (II): The effects of duct length
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有限长度硬壁管道中声源分布的声音激发、传播和辐射（II）：管道长度的影响
DOI：
10.1016/s0022-460x(73)80372-4
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发表时间：
1973
影响因子：
4.7
通讯作者：
P. Doak
中科院分区：
文献类型：
--
作者：
P. Doak
推导并讨论了有限长度管道内由于声源（或力）分布而引起的管道内外声场的精确计算方法。具体的结果提出了硬壁管道的情况下，不携带平均流量和有效地，挡板终止孔。计算方法的基础是这样的，它可以推广到具有均匀平均流量和平均温度轴向不连续的管道。结果表明，在不需要先计算整个辐射声场的情况下，可以用一定的模态孔径系数来确定管道内的声场和总辐射声功率。
Exact methods of calculating the sound fields both inside and outside a duct of finite length, due to an acoustic source (or force) distribution inside the duct, are derived and discussed. Specific results are presented for the case of a hard-walled duct carrying no mean flow and having, effectively, baffled termination apertures. The basis of the calculation methods is such that it can be extended to ducts carrying uniform mean flows, and with axial discontinuities in mean temperature. The results show that the sound field inside the duct, and the total radiated acoustic power, can be determined in terms of certain modal aperture coefficients, without the necessity of first calculating the entire radiated sound field.