easement curve

基本解释

Easement curve was introduced, whereby curvature changes steadily form a straight line to the desired radius.
缓和曲线推出，即曲率变化，稳步形成一条直线，以达到预期的半径。
It presents the rigorous method to calculate the intersecting point coordinate of the straight line with the parallel to the easement curve.
提出了计算直线与缓和曲线平行线交点座标的严密方法。
A new calculating formulae is suggested for selecting curveradius in horizontal realinement under the condition of unchanged length of easement curve.
另外建议一个在既有缓和曲线不改动时计算曲线半径的公式。