【摘要】 利用有限元-边界元数值方法,建立了微缩坦克炮塔基体雷达散射截面(RCS)的仿真计算模型,研究了模型中各种边界层的设置条件,计算分析了单元尺寸、单元类型、PML单元层数以及模型外表面阻抗边界条件对目标RCS计算精度的影响.研究结果表明,应用一阶六面体HF120型单元离散等效源表面到PML外表面之间区域,可将厘米级目标RCS的计算时间缩短至20%,有限元模型中PML单元层数可减少到3层.更多还原

【Abstract】 The simulation model for radar cross section(RCS) of a tank barbette is established by FEM-BEM.Setting principles of suppositional layers such as PML and PEC in the FE model are determined.The influences of element size,element type,number of PML layers and surface impedance boundary conditions on precision of the FE model are calculated and analyzed.The results indicate that dispersing the area between ESS and exterior of PML by first order hexahedral elements HF120 cuts the calculation time down for centimeter objects by 80%.And in the FE model, decreasing the number of PML layers to 3 is also practical.更多还原