| This article integrated with practice researches the control system of multifunctional experiment device which is one child item of "211" project and aims at testing dynamic characteristic of gear wheel. First we make out the whole scheme of the system according to the index requirement of experiment device, studies the control circuit of experiment device adopting latest electronic display and control unit such as PLC, touch screen, thyristor velocity regulator, and analyzes the theory, method, realization of control system the emphasis of which is control theory of tyristor DC motor velocity regulator. Second, in order to display the data collected in experiment, we make a program on PC to communicate with PLC and display the collected data in terms of chtirt,table,etc. Also it can be connected with dynamic analysis program so it can carry out mechanic dynamic performance analysis. The emphasis of the second part is serial port programming on PC using C++Builder 5.0. Furthermore, in order to get rid of the noise we process the collected data with digital means and the emphasis is the design of FIR filter and trap filter. The production of this article is an important part of experiment device and it is valuable to analyze dynamic performance of gear wheel and other transmission part.
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