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공압 피로 시험기 구성을 위한 공압실린더의 고속/고정밀 제어기술
채근병(Geun Byeong Chae),심범식(Bumsik Sim),김영신(Yeongshin Kim),김후식(Hushik Kim),김봉호(Bongho Kim),이원균(Wonkyun Lee) 한국생산제조학회 2020 한국생산제조학회지 Vol.29 No.3
A hydraulic cylinder is typically used in fatigue testing machines for generating reciprocal motion. Hydraulic cylinders adversely affect the environment because they consume high amounts of oil for maintenance. Pneumatic cylinders can serve as potential alternatives to overcome this drawback. However, it is difficult to control a pneumatic cylinder with high accuracy due to the compressibility of air. This study presents a new control method for high-speed and high-precision control of a pneumatic cylinder for a servo-pneumatic fatigue testing machine. Displacement and load controllers with proportional-proportional-integral feedback and feedforward algorithms are proposed. Furthermore, an auto-tuning algorithm of a feedforward controller gain is proposed to improve control performance. A servo-pneumatic fatigue testing machine is constructed, and the control performance is evaluated via displacement and load control experiments at the various conditions.