混合法研究水下刚性目标全波数散射特性  

Hybrid Approach for Studying Scattering Characteristics of Underwater Rigid Objects in all Wave Numbers

作　　者：程广利[1] 刘成元[1] 张明敏[1] 

机构地区：[1]海军工程大学电子工程系,武汉430033

出　　处：《武汉理工大学学报（交通科学与工程版）》2009年第4期745-748,共4页Journal of Wuhan University of Technology（Transportation Science & Engineering）

基　　金：海军工程大学自然科学基金项目资助(批准号:2008HGDJJ022)

摘　　要：为了全面了解水下目标的特征,将边界积分方程法与Kirchhoff近似相结合,提出了用于计算水下刚性目标全波数内散射强度的混合法.在用近似方法消除解边界积分方程时存在的低阶奇异性问题后,将选定的CHIEF点的空间坐标加以改进,以解决Helmholtz外边界数值问题解的非惟一性并提高其数值精度.运用混合法计算了全波束域内有限长刚性圆柱体的回声散射强度,从提高计算效率的角度出发,讨论了这2种不同方法最佳的过渡波数.数值结果表明,混合法综合利用了两种数值方法的计算优点,提高了计算的精度和效率.In order to obtain characteristics of underwater objects in detail, Boundary Integral Equation Method （BIEM） and Kirchhoff approximation are combined for computing the scattering strength of underwater rigid objects in all wave numbers. After resolving the low-order singularities with approximation method, space coordinates of selected CHIEF （Combined Helmholtz Integral Equation Formulation） points are improved for resolving the non-uniqueness of numerical solutions for Helmholtz exterior boundary-value problem and raising computation accuracy of solutions. Echo scattering strengths of rigid cylinder with finite length in all wave numbers are computed by using the hybrid approach, and the optimal transitional wave number for using different methods is discussed from the point of view of increasing the computation efficiency. Numerical results indicate that computational merits of both numerical methods are synthesized in the hybrid approach, and computational accuracy and efficiency are both enhanced.

关 键 词：声散射 混合法 边界积分方程法 Kirchhoff近似 全波数 CHIEF点 

分 类 号：TB559[理学—物理]