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유압 트랜스포머를 이용한 에너지 절감형 유압시스템에 관한 기초연구
이민수(M. S. Lee),안경관(K. K. Ahn),조용래(Y. R. Cho),Ho Triet Hung 유공압건설기계학회 2008 유공압건설기계학회 학술대회논문집 Vol.2008 No.10
In order to reduce energy consumption, secondary controlled system has been applied to many types of equipments. In lifting equipments or press machines using hydraulic cylinder, a hydraulic transformer is used as a control component instead of a valve for motion control and a component for recovering potential energy of load. The transformer is combination of a variable displacement pump/motor as a secondary controlled element and a fixed displacement pump/motor. Based on the nominal model derived from mathematical model, the feedback type two-degree-of-freedom controller is designed and implemented. From simulation results, the disturbances including nonlinear friction torque, leakage flow and load force can be compensated and good positioning accuracy is obtained. It show that the proposed controller is effective.