| Summary: | 碩士 === 國立中興大學 === 機械工程學系所 === 102 === The virtual machine tool technology is the development trend in nowadays. Because this technology can reduce the development time and production cost effectively, it is becoming an important technique for Taiwan’s machine tool industry. In this thesis, we are focusing on the construction of the servo-control loop for the virtual machine tool. Through the system identification, the frequency response function of the system was acquired. The unknown parameters of the servo-control loop are obtained by using curve fitting method. The MATLAB/Simulink software is used to construct the system’s control model. The structure of the servo control loop is consisted of PI controller with inner current loop followed by velocity loop and position loop. After that the non-linear elements such as, feed-forward controller, model of friction and filters are added to complete the full model of servo controller. From the unit step experiment results, it is found that the error between the simulation model and actual values are less than 4% (except for test II 8.7% in rising time) for velocity loop; while, for position loop, it is less than 1%. In sine wave tracking experiment, the errors are less than 2% for both feed-forward controller & friction model.
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