| This dissertation research and develop the multifunctional experiment bench system aimed to help the students of measuring and control technology major to learn the course of automatic control principles by experiments.The experiment bench system was designed on modularized ideas. Virtual instruments seamlessly bonded with hardware circuits facilitate adding new experiment items flexibly. Two different schemes for rotational speed and positional serve of direct current motor were conceived. One scheme is based on analog circuits and the other is based on digital circuits and computer software. Powerful virtual instruments and computer-aided analysis & design software of control system were developed, which increased efficiency of experiment teaching.The main work in this paper contains:1. Based on facts and analysis, mechanical system of experiment bench system was developed, also the types of motors and sensors were selected.2. Completing detail design of analog control circuits for rotational speed of dc motor, power driver circuit board and multifunction-integrated control circuit board were developed.3. After demand analysis, detail design of digital control scheme of rotational speed & positional serve of dc motor was figured out. Multifunctional kinetic control card based on EPP interface of computer was developed. Flow process chart of real-time control routine based on computer was presented.4. After analyzing the requirement of experiment course of automatic control principles, several experiment items such as time-domain analysis in linear system, open-loop rotational speed control, closed-loop rotational speed control, system adjustment are designed. The virtual instruments also completed the functions of oscilloscope, arbitrary curve generator etc.Finally, the paper designed a prototype instrument for experiments which has been applied into the teaching courses for undergraduates of grade 2001. Good results were obtained. |
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