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(接上期)缓和曲线的非线性函数ξ(t),尽管我们可以用另外一种方式来定义函数ξ(t),正如以上章节里叙述的那样,但还是要使得其符合一定的条件:(1)列车在经过缓和曲线时应该尽可能地平顺。列车在缓和曲线起点(直缓点)和终点(缓圆点)处,前轮的偏转速率为零。在缓和曲线上,列车前轮偏转速率应该匀速增大或是减小。列车在缓和曲线起点(直缓点)处时,前轮的偏转角度应该为零,但是在缓圆点处时,偏转角度应该与圆曲线上前轮的偏转角度相连接(一样大)。
(T), although we can define the function ξ (t) in another way, as described in the previous section, but still make it meet the following conditions: ( 1) The train should be as smooth as possible after the relaxation curve. The train at the beginning of the easing curve (straight ramp) and the end point (slow dot), the front wheel deflection rate is zero. On the easing curve, the front wheel yaw rate should increase or decrease uniformly. The front wheel deflection should be zero when the train is at the beginning of the curve (straight retard), but at the slow corner, the deflection angle should be the same (as large) as the deflection angle of the front wheel on the circular curve.