비례전자밸브를 사용한 유압서보계의 압력제어

양경욱,오인호,이일영,Yang, Kyong-Uk,Oh, In-Ho,Lee, Ill-Yeong 대한기계학회 1997 大韓機械學會論文集A Vol.21 No.8

The purpose of this study is to build up control scheme that promptly control pressure in a hydraulic cylinder having comparatively small control volume, using a PCV (proportional control valve) and a digital computer. Object pressure control system has the character to be unstable easily, because the displacement-flow gain of the PCV is too large considering the small volume of the hydraulic cylinder and the time delay of response of the PCV is comparatively long. Considering the above-mentioned characteristics of the object pressure control system, in this study, control system is designed with two degree of freedom control scheme that is composed by adding a feed-forward control path to I-PDD$^{2}$ control system, and a reference model is used on the decision of control parameters. And through some experiments on the control system with FF-I-PDD$^{2}$ controller, the validity of this control method has been confirmed.

오일펜스 유압 권취기에 적용되는 제어 알고리즘

양경욱(Kyong Uk Yang),김태호(Tae Ho Kim),장덕종(Deok Jong Jang),김대안(Dae An Kim) 전남대학교 수산과학연구소 2006 수산과학연구소논문집 Vol.15 No.2

The this study deals with the self turing control of a hydraulic reel for oil fence. The STC has been designed to compensate for parameter changes such as pressure, oil viscosity and velocity. A suggestion of STC(Self tuning Control) are designed on the basic of modified Ziegler-Nichols criterion for digital control loops. The process is modelled as a controlled regression of the third order and its parameters estimated using the recursive least squares method with directional forgetting is applied. The algorithm is suitable for automatic setting of digital PID controllers for control the deterministic.

커플링구조를 이용한 가동위어의 동기제어시스템 설계

양경욱(Kyong Uk Yang),변정환(Jung Hwan Byun) 한국전자통신학회 2017 한국전자통신학회 논문지 Vol.12 No.5

조석수조에서 수위를 조절하기 위한 위어는 자체에 부착된 2대의 전동실린더에 의해 상하로 이송된다. 이때 발생되는 좌ㆍ우 전동실린더의 이동거리 차는 위어의 불균형과 마찰을 일으키므로, 위어는 목표지점으로 이송될 수 없게 된다. 본 연구에서는 위어를 신속하고 정확하게 이송하기 위한 동기제어시스템이 구축된다. 교차결합구조에 기초한 이 동기제어시스템은 두 개의 I-PD제어기와 한 개의 진상보상기로 구성된다. 각 I-PD제어기는 전동실린더가 오버슈트와 입력포화를 발생시키지 않고 위치지령을 정확히 추종하도록, 그리고 진상보상기는 신속하고 안정적으로 동기가 되도록 설계된다. 끝으로 시뮬레이션을 통해 설계된 동기제어시스템이 동기오차의 제거에 효과적임을 나타낸다. The weir to regulate water level in a tide generation tank is above and below carried by two electric cylinders which are mounted on right and left of weir itself. In this case, a movement difference between right and left cylinder causes unbalance of weir and friction between weir and guide. And then, the weir will not be sent to target point. In this study, a synchronous control system is developed to take accurate and quick equilibrium of the weir. The control system based on cross coupled structure consists of two I-PD controllers and a lead compensator. Each of the I-PD controllers is designed in order that the electric cylinder may exactly follow the reference signal without overshoot and input saturation. And the lead compensator is designed to achieve stable and accurate synchronization. Finally, the simulation result shows that the designed synchronous control system is effective for elimination of synchronous error.

유압모터 구동용 동기제어 시스템 제안

양경욱(Kyong-Uk Yang) 전남대학교 수산과학연구소 2019 수산과학연구소논문집 Vol.28 No.-

In this paper, we study the synchronous control of hydraulic system with two hydraulic motors in the hydraulic system. A hydraulic motor use for a rotary motion in hydraulic system. As the external load force in the hydraulic system increases, the hydraulic power can not be generated by only one hydraulic motor, therefore it is used to generate the hydraulic power by connecting two hydraulic motors. At this time, the same external load must be applied to two hydraulic motors depending on the external load, so a stable hydraulic system can be provided. The power acting on the hydraulic motor is controlled using the hydraulic control valve installed at the inlet side of the hydraulic motor. Therefore, the hydraulic motors must be controlled and synchronized using the hydraulic control valve. The method for synchronizing is to use the control algorithm we proposed, the synchronization target is set to the rotation number of the hydraulic motors, and to perform the modeling of the hydraulic system. We propose a synchronization method for the hydraulic motor and verify the usefulness of the proposed method through simulation results in this study.

커플링구조에 기초한 전기추진시스템의 동기제어에 관한 연구

양경욱(Kyong Uk Yang),변정환(Jung Hwan Byun) 한국전자통신학회 2018 한국전자통신학회 논문지 Vol.13 No.2

본 연구에서는 무인선, 어군탐지선 등의 듀얼 전기추진시스템에서 두 프로펠러 간에 발생되는 속도 차, 즉 동기오차를 억제하기 위한 동기제어시스템이 설계된다. 이 제어시스템은 각 추진시스템에 대한 예비필터와 속도제어기 그리고 추진시스템 간에 교차 결합된 동기제어기로 구성된다. 예비필터와 속도제어기는 추진시스템이 오버슈트와 입력포화 없이 속도지령을 추종하도록 설계된다. 그리고 동기제어기는 비대칭 외란과 동특성 불일치가 동기오차에 미치는 영향을 분석한 후, 동기제어시스템의 감쇠성과 속응성을 고려하여 설계된다. 끝으로, 시뮬레이션을 통해 설계된 제어시스템이 동기오차의 제거에 효과적임을 보여준다. In this study, the synchronous control system is designed to restrain the speed difference generated between two propellers, namely, synchronous error in a dual electric propulsion system of unmanned surface vehicle, fish finder boat, etc. The control system based on coupling structure is composed of pre-filters and speed controllers for each propulsion system and a synchronous controller cross-coupled between two propulsion systems. The pre-filter and speed controller are designed in order that the propulsion system may follow the speed reference without overshoot and input saturation. And the synchronous controller is designed in consideration of damping and quickness of the synchronous controller system after analyzing effect of the skew disturbance and mismatched dynamic characteristics on synchronous error. Finally, the simulation results show that the designed control system is effective for elimination of synchronous error.

공기 제어에 의한 자동 부침 부자의 부침 성능

김태호,허정규,양경욱,Kim, Tae-Ho,Hur, Jung-Gyu,Yang, Kyong-Uk 한국마린엔지니어링학회 2010 한국마린엔지니어링학회지 Vol.34 No.5

자동 부침식 가두리 시설을 개발하기 위해 가두리 시설을 구형 부자로 단순화하여 이것의 자동 침하 및 상승 관련 제어 알고리즘 및 프로그램을 개발하였고 실내 수조 실험을 통해 그 유용성을 확인하였다. 또한 기존 연구 결과의 수치와도 비교 분석함으로써 기존 연구의 수치 모델 결과의 유용성을 재확인하게 되었다. 그리고 실물 실험에 대한 선행 연구로써 많은 변수들과 부력에 대한 비선형적인 메커니즘을 제어를 통해 극복하였으며, 이는 실물 실험에 있어 중요한 요소로 작용될 것이다. The primary object of this study was to develop the control algorithm and program for automatic submersible buoy which is free to move vertically within the water column by adjusting weight and buoyancy forces by air control. The experiment was performed to validate the usefulness of the program in the indoor water tank. In the experiment, the automatic submerging and surfacing of the buoy were controlled by water-pressure gauge and air control system. The buoy is raised by injecting compressed air from a compressor and then is lowered by releasing the air. The submerging and surfacing characteristics of the buoy calculated with the numerical model were similar to measurements obtained with the experiment. It was concluded that the algorithm and program could be useful in analyzing various parameters and submerging mechanisms required to design new type of automatic submersible fish cage system.

전달질량계수법을 이용한 2차원 곡선 보의 과도상태 응답해석

최명수(Myung-Soo Choi),양경욱(Kyong-Uk Yang) 한국동력기계공학회 2019 동력시스템공학회지 Vol.23 No.3

소형 준설선 유압 추진기의 최적 제원 도출 및 성능 검증에 관한 연구

백도선(Do Sun Baek),양경욱(Kyong Uk Yang) 유공압건설기계학회 2021 드라이브·컨트롤 Vol.18 No.4

In this study, we designed a hydraulic propulsion propeller system that allows dredged materials to be carried out by the dredger to the disposal place. The proposed model equation was used to formulate the screw propeller specifications considering the resistance to the dredger, and the quantitative specifications of the hydraulic propulsion propeller were determined through the numerical analysis programs. In addition, based on the proposed results, we were able to determine the specifications of the hydraulic system that was used for the hydraulic motor in the propulsion propeller device and then manufactured the hydraulic propulsion propeller. To guarantee the reliability of the proposed model equation, an external testing agency was invited and verified that the hydraulic propulsion propeller based on the proposed model equation could achieve the target speed in the dredger.

파의 수평운동을 이용한 가동물체형 파력발전장치의 개발과 전력생산에 관한 수리실험

황성수(Seong Su Hwang),이동수(Dong Soo Lee),양경욱(Kyong Uk Yang),변정환(Jung Hwan Byun),박일흠(Il Heum Park) 한국해안해양공학회 2016 한국해안해양공학회 논문집 Vol.28 No.2

파의 왕복운동을 지속적인 일방향 회전운동으로 유도하여 발전기의 가동에 있어 기계적인 손실 에너지를 감소시켜 발전효율을 극대화시킬 수 있는 파의 수평왕복운동을 직접 이용하는 가동물체형 파력발전장치가 개발되었다. 그리고 실제 전력생산에 관한 수리실험이 수행되었고 그 결과가 토의되었다. 수리실험에서 부력 탱크의 형상에 따른 발전장치의 발전효율은 파력판의 무게를 충분히 지탱하는 직경 9 cm의 고정식 부력 탱크가 평균발전효율 14.6%로 좋은 결과를 보였으며 효율이 좋을 것으로 기대되었던 부력 탱크가 자유로이 승강하는 경우는 발전효율이 8.5%로 좋지 못한 결과를 보였다. 그리고 여러 파랑조건에 따른 직경 9 cm의 고정식 부력 탱크형 발전모형의 평균발전 효율이 수심 90 cm에서 기어비 2단 3.9%, 3단 4.9%, 4단 4.9%, 5단 12%, 6단 10.0%, 7단 3.1%, 그리고 8단 3.0%를 나타냈으며, 수심 80 cm의 기어비 5단에서 15%의 발전효율이 계측되었다. 따라서 이 파력발전장치는 수심 80~90 cm의 기어비 5단에서 비교적 높은 13.5%의 평균발전효율을 얻을 수 있었다. To reduce the mechanical energy loss and to get the high energy efficiency, an apparatus of wave power generation inducing a consistent one way rotating motion from the wave reciprocation motions was developed and the hydraulic experiments for the real electric power production were conducted and the results were discussed. In the experiments for the shape of the buoyant tank, the efficiency of the fixed 9 cm diameter type enduring the wave plate weight was 14.6% and this was the best result for all shapes. But although the free sliding type was expected to represent a high efficiency, the experiments did not show a good result as 8.5% efficiency. Therefore, the shape of buoyant tank was decided as the fixed 9 cm diameter type in the next all tests. In the experiments for the various incident waves, when the water depth was 90 cm, the average efficiencies were measured as 3.9% in the 2nd gear, 4.9% in the 3rd gear, 4.9% in the 4th gear, 12.0% in the 5th gear, 10.0% in the 6th gear, 3.1% in the 7th gear, and 3.0% in the 8th gear. Also, when the water depth was 80 cm, the average efficiency was shown as 15.0% with 5th gear condition. Therefore the high average efficiency as 13.5% was given with 80~90 cm water depth and the 5th gear in the model.

종황비에 따른 오일펜스용 모형 전개 장치의 전개력

김태호(Tae Ho KIM),장덕종(Duck Jong JANG),양경욱(Kyong Uk YANG),김대안(Dae An KIM),나선철(Sun Chol NA) 전남대학교 수산과학연구소 2009 수산과학연구소논문집 Vol.18 No.1

In order to investigate the spreading performance of model canvas plates of spreading devices for oil fence by aspect ratios and spreading force FL and drag FD acting on them in a circulating water channel, 3 types of rectangular canvas plates with aspect ratios of 1/1.2, 1, and 1.2, respectively were manufactured. FL and FD is described as FL=CL(1/2)pSv² and FD=CD(1/2)pSv², where p is water density, S is the projected area of canvas, and v is current speed, respectively. The maximum spreading force coefficients CL at current speed of 0.2, 04 and 0.6 m/s were 1.5-1.6 at attack angle of 32-38° in case of aspect ratio with 1/1.2, 1.7-1.8 at attack angle of 38-44° in case of aspect ratio with 1, and 1.8-1.9 at attack angle of 40-46° in case of aspect ratio with 1.2, respectively. In addition, the ratios of CL to CD were 1.41 in case of aspect ratio with 1/1.2, 2.01 in 1, and 2.0, and 3-3.4 in 1.2, respectively.