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적은제어 기법을 이용한 전기-유압 액츄에이터의 위치제어
조승호(S. H. Cho) 유공압건설기계학회 2009 유공압건설기계학회 학술대회논문집 Vol.2009 No.11
This paper deals with the issue of simple adaptive position control for a pump-controlled cylinder system. A fixed displacement pump is utilized instead of servo valve and its speed is controlle by AC motor. The whole control system is composed of a pair of interconnected subsystems, that is, a feedback control system and a feedforward control syste. From experiments it is shown that position control using simple adaptive control can accomplish significant reduction in position tracking error comparing to a conventional PID control.
조승호(S. H. Cho) 유공압건설기계학회 2013 드라이브·컨트롤 Vol.10 No.3
This paper presents a robust motion tracking control of a cylinder-toggle servomechanism for injection molding machines. Virtual design model has been developed for a five-point type toggle mechanism. A sliding function is defined and combined with PID control to accommodate mismatches between the real plant and the linear model used. From tracking control simulations, it is shown that significant reduction in position tracking error is achieved with clamping force build-up through the use of proposed control scheme.
조승호(S. H. Cho) 유공압건설기계학회 2008 드라이브·컨트롤 Vol.5 No.4
This paper deals with the issue of position tracking control of a clamp-cylinder for injection moulding machine with electric-hydrostatic drives. A fixed displacement pump is utilized in combination with AC motor in order to directly control a clamp-cylinder. A clamp-cylinder may be required to operate under a variety of operating conditions. Therefore, robust control performance is important in position tracking control applications. In order to accommodate mismatches between the real plant and the model used for controller design, discrete-time sliding mode control is developed by combining a velocity feedforward loop. From tracking control experiments, it is shown that significant reduction in position tracking en-or is achieved through the use of sliding mode control.
조승호(S.H. Cho),김정환(J. H. Kim),권대석(D.S. Kwon),송종훈(J.H. Song),최승렬(S.R. Choi),김율태(Y.T. Kim),조태희(T.H. Cho),한상영(S.Y. Han) 한국정보과학회 1994 한국정보과학회 학술발표논문집 Vol.21 No.1
Tera Flops 성능의 초병렬 프로세서를 구성하기 위해서는 확장성있는 구조를 필요로 할 뿐 아니라, 병렬성 활용에 있어서도 진보된 방식이 요구되며, 기존 소프트웨어의 활용, 병렬 프로그램의 효과적인 개발을 위해서는 프로그래밍이 용이해야 한다. 본 논문에서는 이러한 대규모 병렬 처리를 위한 병렬 실행 모델을 바탕으로 노드 구조를 설계하고 시뮬레이션을 통해 성능 평가하였다. 본 논문에서 개념을 설계된 노드 구조는 스케쥴링과 동기화, 메시지 처리를 별도의 통신 제어기가 담당하게 하여, 프로세서가 프로그램을 실행하는 도중에 메시지를 처리해야 함으로써 발생하는 계산 자원의 낭비를 제거하고자 하였다. 또한, 초병렬 프로세서에서 필연적으로 발생하는 원격 메모리 접근 지연 시간을 문맥 전환을 통한 다중스레딩 기법으로 해결하고, 강력한 동기화 기능을 지원함으로써 다양한 종류의 동기화가 효율적으로 구현 가능하다는 장점을 가지고 있다.
조승호(S. H. Cho) 유공압건설기계학회 2015 드라이브·컨트롤 Vol.12 No.2
This paper focuses on the issue of force synchronizing control for the injection servomechanism of injection molding machines. Prior to the controller design, a virtual design model was developed for the injection mechanism with an AC servomotor-ball screw. A synchronizing controller is designed and combined with the PID control to accommodate the mismatches between the real plant and the linear model plant used. Due to the plant uncertainty, the stiffness and the damping of the mechanism were considered. From the tracking control simulations based on the virtual design model, it is shown that a significant reduction in force synchronizing error is achieved through the use of a proposed control scheme.
4축 구동 유압실린더-클램핑 부하 시스템의 힘 동기제어
조승호(S. H. Cho) 유공압건설기계학회 2014 드라이브·컨트롤 Vol.11 No.2
This paper deals with the issue of force synchronizing control for the clamping servomechanism of injection molding machines. Prior to the controller design, a virtual design model has been developed for the clamping mechanism with hydraulic systems. Then, a synchronizing controller is designed and combined with an adaptive feedforward control in order to accommodate the mismatches between the real plant and the linear model plant used. As a disturbance, the leakage due to the ring gap with relative motion in the cylinder has been introduced. From the robust force tracking simulations, it is shown that a significant reduction in the force synchronizing error is achieved through the use of a proposed control scheme.
적응제어 기법을 이용한 전기-유압 액츄에이터의 위치제어
조승호(S. H. Cho) 유공압건설기계학회 2010 드라이브·컨트롤 Vol.7 No.3
This paper deals with the issue of simple adaptive position control for a pump-controlled cylinder system. A fixed displacement pump is utilized instead of servo valve and its speed is controlled by AC motor. The whole control system is composed of a pair of interconnected subsystems, that is, a feedback control system and a feedforward control system. From experiments it is shown that position control using simple adaptive control can accomplish significant reduction in position tracking error comparing to a conventional PID control.
조승호(S. H. Cho) 유공압건설기계학회 2011 드라이브·컨트롤 Vol.8 No.2
This paper investigates the motion control of a hydraulic motor-load system using the Simple Adaptive Control (SAC) method. The plant transfer function has been modelled mathematically. The open-loop responses have been obtained experimentally in order to identify the design parameters of transfer function. The hydraulic motor-load system has been modelled using the 3D CAD and imbedded in the hydraulic circuit simulation program to verify the overall performance. The experimental results confirm that the SAC method gives a good tracking performance compared to the PID control.
조승호(S. H. Cho) 유공압건설기계학회 2012 드라이브·컨트롤 Vol.9 No.3
This paper deals with the issue of model reference adaptive control strategy to control the injection molding machine. Prior to controller design, a pair of transfer functions are derived for the injection and dwelling process based on mathematical models of components. As external disturbances to examine the robustness of the proposed controller, nozzle clogging and contraction of molded objects are considered and realized by proportional valve. The overall simulation system, consisting of hydraulic components, controller and sensors, is implemented using the components of commercial software SimulationX. The simulation results confirm the proposed scheme"s efficiency and robustness.