Output of acoustical sources
Output of acoustical sources
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声源输出
DOI：
10.1121/1.384459
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发表时间：
1980
影响因子：
2.4
通讯作者：
H. Levine
中科院分区：
文献类型：
--
作者：
H. Levine
声源的声辐射在这里被视为具有周期强度和给定多极性质的不动点奇点，受介质中近似结构元素(例如，刚性或阻抗表面)以及背景流的存在的影响。描述了一种通过对远处控制面上的能量通量进行积分来计算净源输出的传统方式的替代方法；这涉及直接评估在主源位置处的二次波函数，并且消除了(预期困难的)通量积分的需要。详细分析了具有相邻光源的各种全平面和半平面表面结构，特别是对偶极子功率因数的显式结果表明，当光源接近半平面的锐边时，其输出会有很大的提高。
Acoustic radiation from a source, here viewed as an immobile point singularity with periodic strength and a given multipolar nature, is affected by the presence of nearly structural elements (e.g., rigid or impedance surfaces) as well as that of a background flow in the medium. An alternative to the conventional manner of calculating the net source output by integrating the energy flux over a distant control surface is described; this involves a direct evaluation of the secondary wavefunction at the position of the primary source and obviates the need for a (prospectively difficult) flux integration. Various full and half‐planar surface configurations with an adjacent source are analyzed in detail, and the explicit result obtained, in particular, for the power factor of a dipole brings out a substantial rise in its output as the source nears the sharp edge of a half‐plane.