1) feed servo system
矩频特性
1.The stepping motor is extensively used as the executive mechanism in the feed servo system of economical type NC lathe.2) torque-frequency characteristic
矩频特性
1.To improve the stepping motor torque-frequency characteristic,a kind of double voltage driving circuit with feedback control for stepping motor was designed and discussed.
为了改进步进电动机的矩频特性,设计了一种具有反馈控制环节的高低压驱动电路,将检测控制环节应用于高低压驱动电路,提高了驱动电源的高频驱动能力。
2.This paper gives out the torque-frequency characteristic curve equation of stepping motor based on the basic power interface circuit of stepping motor, carries out computer simulation and proves its correctness in condition of no magnet saturation.
根据步进电机功率接口的基本电路，推导了三相反应式步进电动机的矩频特性曲线方程。3) collocation
配点
1.Using the fundamental solution of the Laplace equation as the radial basis functions and locating the source points outside the computational domain,the problem of water wave propagation is solved by collocation of only a few boundary points.
在水波传播的数值模拟中采用了一种基于配点和径向基函数的无网格方法.采用Laplace方程的基本解作为径向基函数,将源点布置在模拟波浪场之外,沿边界布置配点而不是划分网格,从而自动满足控制方程,且不存在奇点,不需要求解积分方程.数值造波采用给定入射波面和速度势的方法,数值消波综合采用阻尼层消波和Sommerfeld辐射条件,非线性自由面的演化追踪采用二阶Taylor级数展开式.对线性规则波和非线性三阶Stokes波的模拟显示,数值结果与理论解吻合良好.表明无网格方法不但形式简单、计算速度快,而且稳定性和准确性令人满意,有望成为水波模拟问题的一种有效的数值方法
2.To avoid considering the fluctuation of residual equation, a method on how to choose the location of collocation method is presented in this paper.
本文提出了一种选取变率配点的方法,以避免考虑残值方程的波动情况。4) one time approximate method
一次近似法
1.The paper presents a new method to analyze the stability of geotechnical slopes by Ljapunov function and its one time approximate method as the stability criterion.