COONS曲面在平交竖向设计中的应用

Utilization of Coons in Civil Grade Intersection and Erection CAD Design

文章介绍一种在ＰＣ机上实现平面交叉口的竖向设计的数值计算方法。用Ｃｏｏｎｓ曲面 模拟平面交叉口，实现交叉口数字化。因Ｃｏｏｎｓ曲面为自由曲面，它的边界曲线可是任一曲线， 所以可方便地模拟有缘石圆弧曲线的平面交叉口曲面。另因构造一般的Ｃｏｏｎｓ曲面非常困难， 在此采用较为流行的一种双线性Ｃｏｏｎｓ曲面。它不需直接求出曲面片角扭失，这使得在计算机 上实现平面交叉口的数字模拟较为简便。

This paper introduces a digital method of Coons and uses it in civil street gradeintersection and erection design. A grade intersection can be simulated with the method of Coons. As Coons surface is a free surface with four free border curves, it is simple to simulate the arc of the street intersection. And because of the difficulties of making an ecumenical Coons surface, a bilinear Coons surface, which need not calculate the corner point 's turn vector, is used to simulate the grade intersection easily.