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컨테이너 크레인을 위한 레일 클램프 유압 시스템의 3D 모델링
소명옥(Myung-Ok So),오세준(Sea-Jun Oh),권석경(Seok-Kyung Kwon),김다애(Da-Ae Kim),김진희(Jin-Hee Kim),이선호(Sun-Ho Lee),이정훈(Jeong-Hun Lee),천정성(Jeong-Sung cheon),황태웅(Tae-Woong Hwang),소건백(Gun-Baek So),강선이(Sun-Yi Kang),윤석 한국마린엔지니어링학회 2007 한국마린엔지니어링학회 학술대회 논문집 Vol.2007 No.-
본 연구는 컨테이너 크레인의 레일 클램프 유압 시스템을 3D로 모델링한고, 키보드나 마우스의 간단한 조작으로 분해조립을 실습할 수 있으며 실제 장비와 거의 유사하게 작동할 수 있는 컨테이너 크레인용 레일 클램프 유압 시뮬레이터를 개발하기 위한 기초에 목표를 둔다.
소혜림(Hye-Rim So),소건백(Gun-Baek So),진강규(Gang-Gyoo Jin) 제어로봇시스템학회 2016 제어·로봇·시스템학회 논문지 Vol.22 No.9
Due to its simplicity and high reliability, the box-counting(BC) method is one of the most frequently used techniques to estimate the fractal dimensions of a binary image with a self-similarity property. The fractal calculation requires data sampling that determines the size of boxes to be sampled from the given image and directly affects the accuracy of the fractal dimension estimation. There are three non-overlapping regular grid methods: geometric-step method, arithmetic-step method and divisor-step method. These methods have some drawbacks when the image size M becomes large. This paper presents a BC algorithm for enhancing the accuracy of the fractal dimension estimation based on a new sampling method. Instead of using the geometric-step method, the new sampling method, called the coverage ratio-step method, selects the number of steps according to the coverage ratio. A set of experiments using well-known fractal images showed that the proposed method outperforms the existing BC method and the triangular BC method.
피드포워드 제어와 안티와인드업 기법을 결합한 셀-튜브 열교환기 시스템의 PID 제어
안종갑(Jong-Kap Ahn),소건백(Gun-Baek So),이주연(Ju-Yeon Lee),이윤형(Yun-Hyung Lee),소명옥(Myong-Ok So),진강규(Gang-Gyoo Jin) 제어로봇시스템학회 2014 제어·로봇·시스템학회 논문지 Vol.20 No.5
In many industrial processes and operations, such as power plants, petrochemical industries and ships, shell and tube heat exchangers are widely used and probably applicable for a wide range of operating temperatures. The main purpose of a heat exchanger is to transfer heat between two or more medium with temperature differences. Heat exchangers are highly nonlinear, time-varying and show time lag behavior during operation. The temperature control of such processes has been challenging for control engineers and a variety of forms of PID controllers have been proposed to guarantee better performance. In this paper, a scheme to control the outlet temperature of a shell and tube heat exchanger system that combines the PID controller with feedforward control and anti-windup techniques is presented. A genetic algorithm is used to tune the parameters of the PID controller with anti-windup and the feedforward controller by minimizing the IAE (Integral of Absolute Error). Simulation works are performed to study the performance of the proposed method when applied to the process.
손영득(Yung-Deug Son),소건백(Gun-Baek So),신석신(Seok-Sin Shin),진강규(Gang-Gyoo Jin) 제어로봇시스템학회 2018 제어·로봇·시스템학회 논문지 Vol.24 No.7
In this paper, we address the preliminary design considerations to develop a motor-operated valve (MOV) actuator. Both a lead compensator (LC) and a linear proportional-derivative (PD) controller are considered as a tool for controlling the opening and closing of a valve. The LC is designed using the frequency response characteristics to satisfy the given design specifications. The PD controller with a first-order filter in the denominator is optimally tuned so that a genetic algorithm (GA) minimizes an objective function. There is nonlinear saturation in the valve due to its physical structure and the signals applied to the motor are limited. To assess the stability of the overall feedback system when one of the designed controllers is used in operations in a nonlinear section, this study applies Popov’s stability criterion. Simulation works are performed to validate the effectiveness of the proposed methods.
소명옥(Myung-Ok So),오세준(Sea-Jun Oh),김다애(Da-Ae Kim),김진희(Jin-Hee Kim),황태웅(Tae-Woong Hwang),이선호(Suh-Ho Lee),천정성(Jung-Sung Cheon),이정훈(Jung-Hun Lee),소건백(Gun-Baek So),강선이(Sun-Yi Kang),박하늘(Ha-Neul Park),이종은(Jon 한국마린엔지니어링학회 2007 한국마린엔지니어링학회 학술대회 논문집 Vol.2007 No.-
본 연구는 와이어 로프 텐션너의 유압 시스템을 3D로 모델링한고, 키보드나 마우스의 간단한 조작으로 분해조립을 실습할 수 있으며 실제 장비와 거의 유사하게 작동할 수 있는 로프 텐션너의 유압 시뮬레이터를 개발하기 위한 기초에 목표를 둔다.
손영득(Yung-Deug Son),소건백(Gun-Baek So),진강규(Gang-Gyoo Jin) 제어로봇시스템학회 2017 제어·로봇·시스템학회 논문지 Vol.23 No.1
Maintaining stable tension of mooring winch ropes on-board a ship under waves, tides and draft change is very important for the safety of the ship. Hydraulic mooring winches, used for pulling or hauling ropes, are in general highly nonlinear and time varying systems due to the compressibility and varying viscosity of the fluid, oil leakage and disturbances from the load. This paper presents a design method of a nonlinear PID (NPID) controller, combining the linear PD actions and nonlinear I action, for constant rope tension control of a hydraulic mooring winch. The gain of the I term is continuously changed according to the error during the operation for achieving good control effort under the changing external environment and implemented by Takagi-Sugeno type fuzzy rules. The NPID controller parameters are tuned by a genetic algorithm (GA). Effectiveness of the proposed method is verified through a set of simulation works.
이주연(Joo-Yeon Lee),소건백(Gun-Baek So),이윤형(Yun-Hyung Lee),소명옥(Myung-Ok So),진강규(Gang-Gyoo Jin) 제어로봇시스템학회 2015 제어·로봇·시스템학회 논문지 Vol.21 No.5
CSTR (Continuous Stirred Tank Reactor) which plays a key role in the chemical plants exhibits highly nonlinear behavior as well as time-varying behavior during operation. The control of CSTRs in the whole operating range has been a challenging problem to control engineers. So, a variety of feedback control forms and their tuning methods have been implemented to guarantee the satisfactory performance. This paper presents a scheme of designing a nonlinear PID controller incorporating with a GA (Genetic Algorithm) for the temperature control of a CSTR. The gains of the NPID controller are composed of easily implementable nonlinear functions based on the error and/or the error rate and its parameters are tuned using a GA by minimizing the ITAE (Integral of Absolute Error). Simulation works for reference tracking and disturbance rejecting performances and robustness to parameter changes show the feasibility of the proposed method.
SOPTD 프로세스의 외란억제용 IMC 기반 2 DOF PIDC 제어기 설계
조홍우(Hong-Yu ZHAO),박근형(Geun-Hyung Park),소건백(Gun-Baek So),이찬하(Chan-Ha Lee),소명옥(Myung-Ok So) 한국산학기술학회 2023 한국산학기술학회논문지 Vol.24 No.7
본 연구에서는 시간지연이 있는 2차 모델을 대상으로 부하 외란을 효과적으로 억제하기 위한 IMC 기반 2 DOF PIDC 제어기 설계법을 제안한다. 제안한 2 DOF PIDC 제어기는 설정점 필터와 PIDC 제어기로 구성된다. PIDC 제어기는 내부모델제어 원리에 기초하여 외란 억제에 중점을 두고 설계하며, 설정점 필터는 추종 성능을 개선하기 위한 것이다. 제안한 제어기를 시간지연이 있는 2차 공칭 프로세스와 불확실성 프로세스에 적용하고 기존의 제어기와 비교하여 그 유효성을 입증한다. 제안한 방법의 특징은 제어 응답 성능과 안정성 간에 적절히 타협할 수 있을 뿐만 아니라 IMC 필터 시정수 하나만을 조정하여 제어기 파라미터를 동조할 수 있다는 것이다. This paper proposes an IMC-based 2 DOF PIDC controller design method for effective load-disturbance rejection in second-order models with a time delay. The proposed 2 DOF PIDC controller consists of a set-point filter and a PIDC controller. The PIDC controller was designed based on the Internal model control principle, focusing on disturbance rejection, while the set-point filter was introduced to improve tracking performance. The effectiveness of the proposed controller was demonstrated by applying it to second-order models with a time delay, considering nominal and uncertain processes, and comparing it with the existing controllers. One notable feature of the proposed approach was the ability to trade off the control response performance and stability while conveniently tuning the controller parameters by adjusting a single parameter of the IMC filter.