基于波叠加与统计最优近场声全息的单面声场分离技术  

Acoustic field separation technique with single holographic plane based on wave superposition algorithm and statistically optimal near-field acoustical holography

作　　者：王冉[1] 陈进[1] 贾文强[1] 赵发刚[2] 

机构地区：[1]上海交通大学机械系统与振动国家重点实验室,上海200240 [2]上海卫星工程研究所,上海200240

出　　处：《振动与冲击》2012年第22期112-117,共6页Journal of Vibration and Shock

基　　金：国家自然科学基金重点项目(51035007);国家自然科学基金面上项目(50875162)

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要求全息面一侧的声场必须为自由声场。为克服应用上的局限性,提出一种波叠加方法和统计最优近场声全息相结合的方法。针对现有双全息面声场分离技术需在两个全息面上进行声压测量,效率较低的问题,采用波叠加算法根据全息面上声压重构出某个重建面上的声压,利用全息面和重建面的声压数据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,以更少的测点数在全息面两侧都存在声源情况下实现空间声场分离。实验和数值仿真验证该方法的有效性和可行性。Acoustic field on one side of the holographic plane is required to be free in 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 was proposed. WSA was used to reconstruct acoustic pressures on a reconstruction surface. Then, SONAH was used to separate the acoustic quantities produced by sources on one side of a holographic plane. It was shown that even if the source-free requirement can＇t be met, the technique can still realize acoustic field separation using fewer microphones than using those other acoustic field separation techniques with double holographic planesdo. The results of test and numerical simulation showed that this technique is feasible and effective.

关 键 词：声场分离 声场重建 波叠加 统计最优近场声全息 

分 类 号：TB532[理学—物理]