【摘要】 利用Ansoft-Maxwell电磁场有限元分析软件,建立了两根平行长直铜导轨简单电磁轨道发射装置的模型。在导轨材料、求解器、求解精度等保持不变的条件下,选取轨道发射装置中可能采用的几种主要截面形状(包括矩形、T形、环形以及盈月形)的导轨进行仿真计算,通过单独改变某一参数,研究了导轨的宽度、高度、间距、内径、角度等各种几何参数与其电感梯度的之间的关系。分析结果表明,电感梯度随着两导轨之间的间距/(环形及盈月形)导轨的内径的增大而增大;导轨的宽度(矩形)/厚度(环形)、高度(矩形)/角度(环形)越小,电感梯度越大;导轨间距一定时,导轨截面面积越小,导轨的电感梯度越大;而当导轨间距一定时,对相同截面积的矩形截面导轨,宽高比(w/h)越大,电感梯度越大。采用非常规截面形状导轨,有可能获取更大的电感梯度值。更多还原

【Abstract】 This paper investigates how the thickness and width and other geometrical parameters of rails together with separation between them affect the inductance gradient(L′) of railgun. L′ plays an important role in the performance of an electromagnetic launcher(EML),and it determines directly the force that accelerate projectile.Several possible section figures of rail in railguns are discussed respectively,including rectangle section,T-shape section,annular section,and waxing moon section.Also,various figures and various dimensions are tabulated and compared.A finite-element method is discussed to simulate a three-dimensional railgun in this study. Models of 3-D finite element simulations using Ansoft-Maxwell software are performed for the various w,h,R,e,θ,and s values.Values for different geometrical parameters are calculated and compared.It is concluded that to increase L′,the thickness,width and other similar kind of dimensions of rails must be decreased whereas separation between rails ought to increase.In rectangle section rails,the value of inductance gradient will increase as the ratio of w/h increases.更多还原