An equivalent source technique for recovering the free sound field in a noisy environment
An equivalent source technique for recovering the free sound field in a noisy environment
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一种在噪声环境中恢复自由声场的等效源技术
DOI：
10.1121/1.3675004
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发表时间：
2012-02-01
影响因子：
2.4
通讯作者：
Bolton, J. Stuart
中科院分区：
文献类型：
--
作者：
Bi, Chuan-Xing;Bolton, J. Stuart
在以往的研究中，基于等效源法（ESM）的声场分离技术被成功地应用于分离组成非自由场的输入场和输出场。然而，如果入射波被源表面散射，则出射场不是由源在自由场中产生的场。目前的工作的目的是提供一个等效源技术，允许在嘈杂的环境中的自由场的恢复。在这种方法中，传入和传出的字段，包括散射和直接辐射场的测量表面上，被分离，以获得自由场的压力，将由源辐射在消声环境中。恢复的自由场压力，然后使用基于ESM的近场声全息重建的整个自由场的源，这使得结果等同于那些可以从自由场测量。首先给出了该技术的理论描述，然后研究了三个数值例子来证明所提出的方法的能力。(C)2012年美国声学学会。[DOI：10.1121/1.3675004]
In previous studies, a sound field separation technique based on the equivalent source method (ESM) was successfully applied to separate the incoming and outgoing fields composing a non-free field. However, if the incoming wave is scattered by the source surface, the outgoing field is not the field that would be generated by the source in a free field. The object of the present work was to provide an equivalent source technique that allows the recovery of that free field in a noisy environment. In this approach, the incoming and outgoing fields, including the scattered and directly radiated fields on the measurement surface, are separated to obtain the free-field pressure that would be radiated by the source in an anechoic environment. The recovered free-field pressure is then used to reconstruct the whole free field of the source by using near-field acoustical holography based on the ESM, which makes the results equivalent to those that could be obtained from a free-field measurement. A theoretical description of the technique is given first, and then three numerical cases are investigated to demonstrate the ability of the proposed method. (C) 2012 Acoustical Society of America. [DOI: 10.1121/1.3675004]