braking nose dive

This paper, by applying the theory of longitudinal train dynamics, presents an analysis of the impact rules of empty oil tank car marshalled at the end of goods train in lowspeed emergency braking, and discusses the effects of impact speed,characteristic of buffer and height of gravity center of car body upon the vehicle'S pitching angular vibration.

讨论了冲击速度、缓冲器特性、车体重心对车辆点头振动的影响，得出剧烈的纵向冲击引起大幅度点头振动，导致车体后心盘垂直上移与后转向架下心盘错位是造成尾部空油罐车脱轨的主要原因，并对防止此类事故的发生提出了建议。

The four jog control methods,include jogging for zero position,continue move jogging,stepbystep jog,and jog to given position,are realized,by using beneral jog method to CNC cutter grinder.

将数控系统的几种点动控制方式应用于CNC工具磨床上实现 CNC工具磨床的回零点点动 ,连续点动 ,增量式点动与干预点

As an important function of a numerical control (NC) system,pointing control is indispensable during manual adjusting process.

点动控制是数控系统手工调节过程中不可缺少的一个重要功能 ,而点动过程则需要自动升降速 。