对牵引吨位的计算，采用了曲线拟合的计算方法，能够在列车起动最短的时间、运行最短的距离内计算出牵引吨位。
By using the method of curve fitting to calculate the traction tonnage, we can gain the traction tonnage within short time and short distance after the locomotive start.
距离的两倍与时间的平方的最佳拟合曲线的斜率就是重力加速度。
The slope of the best fit line for distance doubled and time squared gives the acceleration due to gravity.
该仿真系统不仅可以用于仿真NC程序文件的执行过程，而且实现了以控制周期为单位，对速度、加速度曲线以及加工时间、加工距离的仿真。
The system can simulate the executive process of nc programme files, and realize the simulation of speed and acceleration curve, and process time and distance with the unit of controlling period.
该仿真系统不仅可以用于仿真NC程序文件的执行过程，而且实现了以控制周期为单位，对速度、加速度曲线以及加工时间、加工距离的仿真。
The system can simulate the executive process of nc programme files, and realize the simulation of speed and acceleration curve, and process time and distance with the unit of controlling period.
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