| Summary: | 碩士 === 國立臺灣大學 === 造船及海洋工程學研究所 === 88 === Proportional valves are often used in industry. As early as 1980, we can’t apply proportional valves to precision control because of its low frequency response, time delay, and overlap. Today’s proportional valves improve on performances, and its performances are close to servo-valves . In this paper, the purpose of study is force control of material testing system using proportional valve.
Hydraulic servo system is nonlinear time-variant system, it changes with the operating environment and time, so it is difficult to obtain an accurate dynamic of mathematics model to design a conventional controller. In this study, we apply fuzzy self-organize control theory in controller design , the fuzzy self-organize controller has the ability of self-tuning. It can tune the fuzzy rules and parameters with the change of operating environment to reach good control performance.
The experiment results show that apply fuzzy self-organize controller in force control of material testing system with proportional valve exhibitting good waveform and response . The results show that apply proportional valve on material testing system is practicable for the reason of reducing capital .
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