基于等效源法的单全息面分离声场研究

近场声全息能高分辨率地重构声场,但是其所要求的严格的自由声场条件在工程上很难得到满足,声场分离的方法能虚拟出自由声场,扩大了近场声全息技术的应用范围。目前的声场分离方法对声源要求有较多的先验知识,一定程度上阻碍了近场声全息技术的应用。文章根据声波等效源法的原理提出一种新的单全息面分离声场方法,无需目标声源和噪声源的先验知识,即可对声场进行分离,达到虚拟消声的效果。通过理论推导证明了方法的正确性,通过数值仿真验证了该方法的可行性。

Study on Sound Field of Single Holographic Surface Separation based on Equivalent Source Method

The near-field acoustic holography can reconstruct the sound field with high resolution, but the condition is strict and is difficult to be satisfied in engineering. The method of sound field separation can virtual the free sound field ,so expand the application range of near-field acoustic holography.The The current method of sound field separation requires more prior knowledge of the sound source,and hindered the application of near-field acoustic holography to some extent. In this paper a new method of single holographic surface separation sound field based on the principle of acoustic equivalent source method is proposed. The sound field can be separated without the prior knowledge of target sound source and noise source. The theoretical derivation ensures the correctness of the method, and the numerical simulation verifies the feasibility of the method.