In order to guarantee the machining surface quality, numerical control lathe generally has constant surface cutting speed control function.
为了保证加工表面质量，数控车床一般都具有恒表面切削速度控制功能。
2
In the traditional numerical simulation, the bottom friction coefficient has been treated as a constant or different constant in different region.
在传统的数值模拟工作中，底摩擦系数被当作一个常数或者在不同的海域取不同的常数。
3
This paper derives the analytical formulas for elements of the matrices using constant and linear elements Therefore, the numerical integral can be avoided.