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장지성(J. S. Jang),지상원(J. W. Ji),김영복(Y. B. Kim) 유공압건설기계학회 2008 드라이브·컨트롤 Vol.5 No.1
Pneumatic driving systems have hard non-linear characteristic and large friction force compared with driving power. Hence, it cannot be robust against parameter uncertainties, modelling error, disturbance and noise. In this study, we apply a mixed H2/H∞ control to the generalized plant for a pneumatic driving apparatus system including parameter uncertainty and disturbance. In order to design the H2/H∞ controller, we use the LMI technique. To evaluate control performance and robust stability of the designed controller, we compare it with a conventional controller such as PVA(Position-Velocity-Acceleration state controller) using the simulation results. As a result, it can be known that designed controller shows better robust stability than the conventional controller.
공급압력 변화에 의한 공기압 실린더 구동장치의 소비에너지 변화량 추정 방법
장지성(J. S. Jang) 유공압건설기계학회 2012 드라이브·컨트롤 Vol.9 No.2
Pneumatic cylinder meter-out driving apparatus is used widely because it is clean, lightweight, and can be easily serviced. In this study an estimation method of energy consumption for pneumatic cylinder meter-out driving apparatus is proposed. The proposed method is derived from state equation and energy equation of air, and, the equation of motion of a moving part of a pneumatic cylinder reflecting the characteristics of the meter-out driving. The effectiveness of the proposed method is proved by simulation study and it demonstrates that the proposed method can evaluate the energy consumption quickly and easily when the parameters of the driving apparatus are changed.