| In order to strengthen the detection process of frictional products of national petroleum mechanical industry and, the ZMS synthetical stimulant brake test bench is developed by the frictional laboratory of China University of Petroleum. The test and control system includes the velocity modulation system of main motor, the control system of the hydraulic aggregate, the control system of the barometric aggregate, the refrigerate system and the positional control system of the caudal mounting. If the caudal mounting can't precisely touch at the front of the brake drum, the brake experiment can't normally be made. Because the positional control system of the caudal mounting was not perfectly designed, it hasn't achieved the expectant outcome during making the brake experiment. To analyse and generalize, the software and hardware is anew designed with the new control mode and strategy to become a direct current positional control system based on PWM.This paper chooses and designs the single chip microcomputer and it's interface electric circuit, the electric circuit used for detecting position and velocity, finally analyses the hardware principium. To ascertain the general architecture and control program, it is classic three loop control with position loop, velocity loop and current loop. After the mathematical model of the whole system was established, it designs the controller of position loop, velocity loop and current loop applying the design method of frequency domain in the project. To make the computer simulation for three loop control system, the simulant results show this system has good dynamic performance, and this design program can resolve the precise control problem of the caudal mounting. At the same time, a visualization software is introduced in detail in this paper, and it is made apply Visual C++6.0 and OpenGL. This software is either applied when the control was designed, or is used to be a monitor software during making an experiment. |
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