基于声压梯度参考的部分场分解方法及实验研究  

An investigation of partial field decomposition using pressure gradient reference

作　　者：毕传兴[1] 郭明建[1] 张永斌[1] 徐亮[1] 

机构地区：[1]合肥工业大学噪声振动工程研究所,合肥230009

出　　处：《物理学报》2012年第15期300-309,共10页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:10974040;11004045);教育部新世纪优秀人才支持计划(批准号:NCET-08-0767);高等学校博士学科点专项科研基金(批准号:20100111110007)资助的课题~~

摘　　要：采用扫描测量方式得到的不相干声场需分解成完全相干的部分场后才能用于近场声全息重建.现有的方法都是将声压作为参考进行部分场分解.本文提出以声压梯度作为参考,并建立一种基于声压梯度参考的部分场分解方法.由于声压梯度比声压的衰减速度更快,受到其他声源和环境噪声的影响比声压小,所以以声压梯度为参考在分解完全相干的部分场过程中比以声压为参考更具有优势.通过数值仿真和实验分析,一方面验证了基于声压梯度参考的部分场分解方法的正确性和可行性:同时通过与基于声压参考的部分场分解结果比较,说明了基于声压梯度参考的部分场分解方法分解更稳健、结果更精确.The incoherent sound field obtained by scanning measurement cannot be used directly for nearfield acoustic holography to reconstruct the sound field.And therefore,the incoherent sound field needs to be decomposed into fully coherent partial fields.In previous methods,the pressure is used as reference to obtain the partial fields.In this paper,the pressure gradient is used as the reference for the partial field decomposition.Because the pressure gradient decays faster than the pressure,the interaction of the pressure gradient between the incoherent sources is weaker than that of the pressure,which may improve the effect of the partial field decomposition.A numerical simulation and an experiment are conducted to test the feasibility of the method.And it is shown that the partial field decomposition method based on pressure gradient reference is robust and the decomposed results are better than those based on pressure references.

关 键 词：不相干声场 近场声全息 声压梯度 部分场分解 

分 类 号：O422.2[理学—声学]