So, that point starts falling back behind the point of contact because the wheel is rotating at the same time as it's moving forward.
这个点开始落到切点的后面,因为车轮滚动的同时也向前运动。
Abstract: the widening of gauge and the overturning of rail will effect the contact point and dynamic forces between wheel and rail.
文摘：轨距扩大和钢轨侧翻将影响到轮轨接触点位置和动力作用。
In this paper the formula of requisite linear damping for overcoming shimmy is derived according to the point contact theory of wheel shimmy.
本文根据机轮摆振的点接触理论，导出了为克服摆振所需线性阻尼的计算公式。
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