用变n次抛物线叠加敷设缓和曲线

Establishment of Transition Curve by a Index Number-Changing Parabola Overlay

按汽车转向时的实际特性分析了公路缓和曲线应满足的理论关系，并采用了变ｎ次抛物线在切线上和圆弧上分别叠加，从而使所敷设的缓和曲线更简化，更附合实际。

In this paper,the theory redation of expressway transition curve has been analysed according to the practical automobile steering property by Parabola with n index number overlaying respectively in the tangent line and circular arc is presented too.The established transition curve accords with the actual situation and the method is simple.