常用螺旋线方程.doc

.坐标系类型方 程曲线形状笛卡尔坐标系x = 20 * cos ( t * 360 * 5 )y = 20 * sin ( t * 360 * 5 )z = 25 * t圆柱坐标系r = 20 * ttheta = 60 + t * 360 *5z=0笛卡尔坐标系s = 20 * tangle = 60 + t * 360 *5 x = s * cos (angle)y = s * sin (angle)z = 0/* 与前一个方程等价圆柱坐标系r = 20 * ttheta = 60 + t * 360 *5z= 50 * t球坐标系rho = 6theta = t * 180phi = t * 360 * 10圆柱坐标系theta = t *360r = 30 + 10* sin(theta*20)z = 10* cos(theta*20)笛卡尔坐标系r = 20 /* r表示基圆半径alpha = t