Sound source identification and sound radiation modeling in a moving medium using the time-domain equivalent source method.
Sound source identification and sound radiation modeling in a moving medium using the time-domain equivalent source method.
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DOI：
10.1121/1.4919352
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发表时间：
2015-05
期刊：
影响因子：
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通讯作者：
Xiao-Zheng Zhang;C. Bi;Yong-Bin Zhang;Liang Xu
中科院分区：
文献类型：
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作者：
Xiao-Zheng Zhang;C. Bi;Yong-Bin Zhang;Liang Xu
平面近场声全息已被成功地推广到运动介质中声场的重建，但重建的声场仍存在对流效应，可能导致声源的错误识别。为了准确识别运动介质中的声源，提出了一种时域等效声源法。该方法将真实的源替换为一系列时域等效源，利用实测压力和已知的对流时域绿色函数迭代求解这些等效源的强度，并采用时间平均法减小迭代求解过程中的不稳定性。由于这些解决的等效源强度是独立的对流效应，它们不仅可以用来识别声源，但也模型声辐射在移动和静态介质。通过数值仿真研究了噪声对等效源强的影响以及时间平均法对减小不稳定性的作用，验证了该方法在声源识别和声辐射建模方面的优越性。
Planar near-field acoustic holography has been successfully extended to reconstruct the sound field in a moving medium, however, the reconstructed field still contains the convection effect that might lead to the wrong identification of sound sources. In order to accurately identify sound sources in a moving medium, a time-domain equivalent source method is developed. In the method, the real source is replaced by a series of time-domain equivalent sources whose strengths are solved iteratively by utilizing the measured pressure and the known convective time-domain Green's function, and time averaging is used to reduce the instability in the iterative solving process. Since these solved equivalent source strengths are independent of the convection effect, they can be used not only to identify sound sources but also to model sound radiations in both moving and static media. Numerical simulations are performed to investigate the influence of noise on the solved equivalent source strengths and the effect of time averaging on reducing the instability, and to demonstrate the advantages of the proposed method on the source identification and sound radiation modeling.