Study of the comparison of the methods of equivalent sources and boundary element methods for near-field acoustic holography
Study of the comparison of the methods of equivalent sources and boundary element methods for near-field acoustic holography
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DOI：
10.1121/1.2359284
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发表时间：
2006-12-01
影响因子：
2.4
通讯作者：
Williams, Earl G.
中科院分区：
文献类型：
--
作者：
Valdivia, Nicolas P.;Williams, Earl G.
基于边界元法（BEM）的近场声全息（NAH）已被成功地应用于通过测量附近共形表面上的压力场来重建任意形状结构表面上的法向速度。一般结构的这种重建的另一种方法是利用等效源法（ESM）。在ESM中，声场由位于靠近结构表面的表面上的一组点源表示。这种方法的吸引力主要在于其实现的简单性和速度。在这项工作中，ESM作为一个近似的边界元为基础的NAH的研究和成功应用这种方法在NAH的必要条件进行了讨论。以点力激励下的圆柱形机身表面为例进行了验证。(c)2006年，美国声学学会。
Boundary element methods (BEM) based near-field acoustic holography (NAH) has been used successfully in order to reconstruct the normal velocity on an arbitrarily shaped structure surface from measurements of the pressure field on a nearby conformal surface. An alternative approach for this reconstruction on a general structure utilizes the equivalent sources method (ESM). In ESM the acoustic field is represented by a set of point sources located over a surface that is close to the structure surface. This approach is attractive mainly for its simplicity of implementation and speed. In this work ESM as an approximation of BEM based NAH is studied and the necessary conditions for the successful application of this approach in NAH is discussed. A cylindrical fuselage surface excited by a point force as an example to validate the results is used. (c) 2006 Acoustical Society of America.