Equivalent source method-based nearfield acoustic holography in a moving medium
Equivalent source method-based nearfield acoustic holography in a moving medium
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移动介质中基于等效源方法的近场声全息术
DOI：
10.1115/1.4036498
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发表时间：
2017
影响因子：
1.7
通讯作者：
Yong-Bin Zhang
中科院分区：
文献类型：
--
作者：
Chuan-Xing Bi;Bi-Chun Dong;Xiao-Zheng Zhang;Yong-Bin Zhang
为了识别流体中的声源，提出了一种基于等效源方法(ESM)的运动介质近场声全息(NAH)方法，并考虑了声压和质点速度两种声学输入。特别是推导出了垂直于流动方向的质点速度与等效源强度之间的解析关系式，从而实现了输入质点速度的重构。与运动介质中的平面NAH相比，该方法适用于几何形状更复杂的声源。对声源分布在平面几何和非平面几何两种类型的声源进行了数值模拟，以验证该方法的性能。结果表明，无论是压力输入还是质点速度输入，该方法都能获得令人满意的重建结果，并且在较宽的流速和频率范围内以及在不同水平的背景噪声下都是有效和稳健的。
To identify sound sources situated in a fluid flow, an equivalent source method (ESM)-based nearfield acoustic holography (NAH) in a moving medium is proposed, and two types of acoustic inputs, pressure and particle velocity, are considered. In particular, an analytical relationship between the particle velocity perpendicular to the flow direction and the equivalent source strength is deduced, which makes it possible to realize the reconstruction with particle velocity input. Compared to the planar NAH in a moving medium, the proposed method is applicable to sound sources with more complicated geometries. Numerical simulations with sound sources distributed over two types of geometries including planar geometry and nonplanar one are conducted to test the performances of the proposed method. The results indicate that the proposed method provides satisfactory reconstructed results whatever with pressure input or with particle velocity input, and it is valid and robust over a wide range of flow velocities and frequencies and under different levels of background noise.