基于波叠加与统计最优近场声全息的单面声场分离技术

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振动与冲击 ›› 2012, Vol. 31 ›› Issue (22) : 112-117.

论文

基于波叠加与统计最优近场声全息的单面声场分离技术

王冉1 陈进1 贾文强1 赵发刚2

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ACOUSTIC FIELD SEPARATION TECHNIQUE WITH SINGLE HOLOGRAPHIC PLANE BASED ON WAVE SUPERPOSITION ALGORITHM AND STATISTICALLY OPTIMAL NEAR-FIELD ACOUSTICAL HOLOGRAPHY

Wang Ran1 Chen Jin1 Jia Wenqiang1 Zhao Fagang2

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摘要

基于空间声场变换的近场声全息以及统计最优近场声全息都要求全息面一侧的声场必须为自由声场。为了克服应用上的局限性，提出了一种波叠加方法和统计最优近场声全息相结合的方法。针对现有的双全息面声场分离技术需要在两个全息面上进行声压测量，效率较低的问题，首先采用波叠加算法根据全息面上的声压重构出某个重建面上的声压，然后利用全息面和重建面的声压数据采用统计最优近场声全息技术分离出全息面某一侧声源在全息面上单独产生的声学量，从而以更少的测点数在全息面两侧都存在声源的情况下实现空间声场分离。实验和数值仿真验证了该方法的有效性和可行性。

Abstract

Acoustic field on one side of the holographic plane is required to be free in the application of STFT based near-field acoustical holography (NAH) and statistically optimal NAH (SONAH). To overcome this limitation, acoustic field separation technique with single holographic plane based on wave superposition algorithm (WSA) and SONAH is proposed. WSA is used to reconstruct acoustic pressures on the reconstruction surface. Then SONAH is applied to separate the acoustic quantities produced by sources on one side of the holographic plane. Even if the source-free requirement can’t be met, the technique can still realize acoustic field separation with fewer microphones than other acoustic field separation techniques with double holographic planes. The results of experiment and numerical simulation verify that this technique is feasible and effective.

导出引用

王冉陈进贾文强赵发刚. 基于波叠加与统计最优近场声全息的单面声场分离技术[J]. 振动与冲击, 2012, 31(22): 112-117

Wang Ran Chen Jin Jia Wenqiang Zhao Fagang. ACOUSTIC FIELD SEPARATION TECHNIQUE WITH SINGLE HOLOGRAPHIC PLANE BASED ON WAVE SUPERPOSITION ALGORITHM AND STATISTICALLY OPTIMAL NEAR-FIELD ACOUSTICAL HOLOGRAPHY[J]. Journal of Vibration and Shock, 2012, 31(22): 112-117