Wheel tread wear leads to change of the wheel profile and rollingdiameter, which influences the dynamic behaviors of railway vehicles seriously.
车轮踏面磨耗导致车轮外形改变，使其滚动圆直径产生偏差，对车辆系统的动力学特性影响较大。
2
The structural parameters of incising wire system are changed by rollingdiameter and the coupling between between tension and velocity is strong, which relations are analyzed.
分析了切丝张力系统卷径时变引起结构参数变化，以及切丝张力与速度之间的耦合关系。
3
The disk type unwinding mechanism has simple structure, small volume, convenient maintenance, safety and reliability, which is also suitable for drum material with large rollingdiameter.