The paper introduced a method that can locate the position of cable breaking point by using the reflection of low pressure impulse, and set up a control system through 89c52.
介绍了一种利用低压脉冲反射法测定电缆断点位置的方法，并采用89c52单片机建立了控制系统。
In the numerical control processing, work coordinate system after the confirmation, but make sure the tip of point in work coordinate system, that is the position usually said sword to subject.
在大型车床加工中，工件坐标系确定后，还要确定刀尖点在工件坐标系中的位置，即通常所说的对刀题目。
In this paper, a pneumatic actuator position servo system is described, which controlled by a five-point switch PWM control method using high-speed switching valves.
本文使用一种五点开关pwm控制算法对高速开关阀控气动执行器进行位置伺服控制。
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