摘要
针对运用边界积分方程法研究低频散射特性时,存在的表面奇异积分和特征频率处解的非惟一性等问题,将波叠加法引入到水下目标低频散射研究中.对刚性球体的低频散射计算表明,该方法较边界积分方程法不仅消除了奇异解和多值问题,而且具有更高的计算速度和精度,适用的频率范围更宽,可用于水下目标低频散射问题的研究.分析表明影响其计算精度的因素主要是虚源空间位置、目标表面与虚源表面划分精细程度.
For resolving the problems of surface singular integral and nonunique solutions at eigenfre- quencies that arise in the boundary integral equation method （BIEM）, wave superposition method （WSM） is introduced to study low-frequency scattering characteristics of submerged objects. Compu- tation results for a rigid sphere at low frequencies demonstrate that WSM overcomes the deficiencies of BIEM and can be used to study low-frequency scattering characteristics of submerged objects with rap- ider calculation speed, higher accuracy and wider frequency domain than BIEM. Analyzed results also indicate that main factors influencing the computational accuracy of WSM are locations of the fictitious sources and fine degree of divided surface of object surface and fictitious surface.
出处
《武汉理工大学学报（交通科学与工程版）》
2010年第2期250-253,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:HGDJJ022)
关键词
波叠加法
低频散射
虚源强度
wave superposition method
low-frequency scattering
fictitious source strength
