板块尺寸在板块元目标散射算法中的特性分析-《计算机技术与发展》

文章信息/Info

Title:: Effect Analysis of Planar Element Size in Planar Element Method for Computing Target Echo

Author(s):: XU Yu; YUAN Bing-cheng; ZHANG Hong-gang; Department of Weaponry Engineering,Naval University of Engineering

Keywords:: planar element method; planar element size; acoustic scattering; target strength

摘要:: 板块元算法是在对Kirchhoff积分公式高频近似的基础上,采用几何建模的方法,计算目标散射声场。板块划分是板块元算法中的一个重要步骤,对计算精度与计算速度有着重要的影响。球体形状目标,因其形状简单,通过积分方法可以进行精确的求解,因此常被选择作为比较不同散射算法效能的参照对象。文中针对球体目标,分别采用板块元散射算法与解析解方法计算球体目标强度,分析不同频率和距离等情况下板块尺寸对板块元算法精度的影响。仿真结果表明,板块尺寸对计算结果的影响主要是由板块拟和目标曲面所导致的几何模型误差和近似计算中计算模型误差二者所引起

Abstract:: Planar element method is one of approximate computation means for echo characteristics of submerged targets,based on geometry modeling.The object meshing is an important step in planar element method,and plays an important role in computation accuracy and velocity.Due to the shape of the sphere is simple,its target strength can be calculated accurately,and the sphere model is often selected as a reference object to compare the different algorithms effectiveness.In this thesis the target strength of sphere is calculated by planar element scattering method and integral equation method,and then the effect of planar element size in planar element method for computing target echo with different frequency and distance is analyzed.Numerical calculation is presented,and the results show that the geometrical shape errors between the model that is fitted by planar element and the true model and the calculation model are the main factors that cause the result errors