油壓機械智慧型控制器研製 Development of Intelligent controllor for Hydraulic Machines

指導教授 : 黃榮堂 陳正光   研究生 : 陳家銘 機電整合研究所 87年


摘要

隨著科技的進步,對精密、強健、高可靠性之產業機械的需求為一必然的趨勢,油壓機械由於其出力大、成型性佳,在產業界一直扮演著重要的角色。可惜的是,相較於對產品品質、尺寸精度、及縮短單位加工時間的要求日益嚴苛,傳統油壓機械使用開路控制無法滿足高精度及響應的要求。本論文研究以閉迴路控制器設計為主,發展一結合"模糊比例-積分控制器"與"模糊比例-微分控制器"之"模糊比例-積分+比例-微分控制器",同時藉由電腦模擬與塑膠射出成型機之射出速度控制實驗結果驗證,其確實能有效改善系統響應。本論文亦將"PID控制器"應用於塑膠射出成型機之射出速度控制,另發展一"模糊邏輯參數調變機制"以藉此調變出適切的控制參數,增進PID控制器性能。同樣地,透過模擬及實驗結果探討對不同系統(線性、非線性)"模糊控制器"與"PID控制器"的適用性。

ABSTRACT

As long as the technology has been improved, the requirement of a precise, robust, and reliable manufacturing machine has been a trend. "Hydraulic Machines", which can provide high power density, usually play an important role in manufacturing industry. Unfortunately, as the demand of quality, precision, and shorter producing cycle time of products increases, the traditional hydraulic machines with open-loop control strategy aren't qualified any more. A "Fuzzy Logic PI+PD Controller"-an integration of "Fuzzy Logic PI Controller" and "Fuzzy Logic PD Controller"-has been developed in this thesis to enhance the performances of hydraulic machines. Some results of computer simulation along with experimental results of the injection velocity control of plastic injection molding machine are also proposed to prove that the "Fuzzy Logic PI+PD Controller" is capable of improving the performances of the hydraulic systems. "PID Controller" has also been applied to the injection velocity control of plastic injection machine in this study. Meanwhile, in order to determine the more suitable controlling parameters, a "Fuzzy Logic Parameters Tuning Mechanism" has been created. The capabilities of "Fuzzy Logic Controller" and "PID Controller" for dealing with both linear and nonlinear systems have been compared via computer simulations and experiments.