基于等效源法的平面近场声全息及其实验研究  

Planar nearfield acoustical holography based on equivalent source approach and its experimental investigation

作　　者：张永斌[1] 毕传兴[1] 陈剑[1] 陈心昭[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：《声学学报》2007年第6期489-496,共8页Acta Acustica

基　　金：国家自然科学基金(10504006;50675056)

摘　　要：目前的平面声源全息重建与预测的主要方法是基于FFT的近场声全息技术,但是该方法存在卷绕误差、边缘重建误差等很多固有的影响重建精度的因素,有时甚至会导致重建结果严重失真。本文提出将等效源法应用于平面声源的全息算法,由于该方法不涉及到波数域空间变换,所以避免了卷绕误差和边缘重建误差,简化了计算过程,有利于工程实际推广。文中首先从理论上推导出了等效源法用于平面声源的理论模型,并以点激励固支板的声辐射实验,验证了该方法的正确性和有效性.The current main approach to reconstruct and predict the acoustical field of a planar source is Nearfield Acoustical Holography （NAH） based on FFT. But this method has some disadvantages such as wraparound error and edge Gibbs phenomena which will contaminate the results badly. A planar NAH based on equivalent source approach is developed in this paper, which has no wraparound error and edge Gibbs phenomena, and is beneficial for engineering application. The experimental results of acoustic radiation generated by a fixed, point-driven plate validate the correctness and availability of the method.

关 键 词：平面近场声全息 等效源法 实验 平面声源 声全息技术 全息重建 空间变换 计算过程 

分 类 号：O422[理学—声学]