有限元/边界元耦合法计算电磁轨道炮三维瞬态涡流场  

Finite-element/Boundary-element Coupling Method for 3D Transient Eddy Current Field Calculation in Electromagnetic Railgun

作　　者：林庆华[1] 栗保明[1] 

机构地区：[1]南京理工大学瞬态物理国家重点实验室,江苏南京210094

出　　处：《南京理工大学学报》2010年第2期217-221,共5页Journal of Nanjing University of Science and Technology

基　　金：南京理工大学科技发展基金(XKF09060)

摘　　要：针对电磁轨道炮电磁场计算中的无穷远边界问题,该文提出用时域有限元/边界元耦合算法进行电磁轨道炮的三维瞬态涡流场的数值模拟。涡流场的控制方程由矢量磁位和标量电位描述,用有限元法求解满足磁扩散方程的含有导轨与电枢的导体区域,用边界元法求解满足拉普拉斯方程的导体以外的区域。耦合边界直接划分在导体表面,不需对边界作特殊处理。该方法消除了对导体周围的空气区域的网格剖分,缩小了计算规模,是一种处理电磁轨道炮电磁场问题的有效方法。Aiming at the infinite boundary problem in the electromagnetic field calculation of railgun,a time-stepping finite-element and boundary-element coupling method is proposed for the numerical simulation of 3D transient eddy current field in railgun.The basic equantions are expressed in terms of the magnetic vector potential and electric scalar potential.The finite-element formulation is employed for the general diffusion equation in a bounded conductor region including rail and armature,while,in the exterior region,the boundary element method is developed for Laplace＇s equation.The coupled boundary is directly put on the surface of conductors and no special treatment on boundary is required.This method results in considerable saving in modeling and it eliminates the surrounding air region,proving useful for solutions in railgun problems.

关 键 词：电磁轨道炮 电磁场 有限元 边界元 数值计算 

分 类 号：TM15[电气工程—电工理论与新技术] TJ012.1[兵器科学与技术—兵器发射理论与技术]