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최혁진(H.J.Choi),오상우(S.W.Oh),이승국(S.G.Lee),김선동(S.D.Kim),이승현(S.H.Lee),이문진(M.J.Lee),변성훈(S.H.Byun),강원수(W.S.Kang),장석(S.Jang) 한국해양환경·에너지학회 2006 한국해양환경·에너지학회 학술대회논문집 Vol.2006 No.-
유조선 경신호는 1988년 포항 대보등대 3.5마일 해상에 침몰하였다. 침몰후 현재까지도 간헐적으로 잔존유가 유출되고 있어 선체내부에 남아 있는 잔존유의 추가 유출에 따른 해양오염사고 발생에 대한 위험성이 재기되고 있다 침몰선체로부터 잔존유 추가 유출 가능성을 조사하기 위해 2006년 5월 무인잠수정과 잔존유 시료채취장치 등 첨단 장비를 이용하여 경신호를 조사한 결과 선체 주변에는 이미 많은 장애물로 덮여 있으며, 잔존유 시료를 채취한 결과 탱크 내부에는 약 300㎘ 이상의 기름이 남아 있는 것으로 분석되었으며, 부식 등의 요인으로 잔존유 유출시 기상상태에 따라 차이는 있으나 1988 사고 당시와 같은 기상상태가 재현된다면 유출된 기름은 포항, 영덕 등 인근 해안가에 부착될 가능성이 있다. The oil tanker, Kyung Shin had sunken in the East Sea, 3.5 mile from Daebo light house of Pohang, Korea in 1988. Because the remained oil of the sunken tanker has been leaking slightly nowadays, it can be a dangerous marine pollutant. For the inspection of additional oil leakage and its possibility, the sunken ship, Kyung Shin was surveyed by using the ROV and oil sampling system in May, 2006. As a result of survey, there are numbers of obstructions on the tanker's body. Based on the survey results and the precedent salvage report, more than 300㎘ oil could be remained by estimation. If same weather condition is reappeared, spilled oil can stick to the coast near Pohang and Yeongdeok.
특수목적기계용 압력보상 기능을 갖는 4륜 구동 주행 유압시스템 특성 해석
이승현(S. H. Lee),김동명(D. M. Kim),이용석,김상호,권순동(S. D. Kwon) 유공압건설기계학회 2017 유공압건설기계학회 학술대회논문집 Vol.2017 No.11
In this study, the characteristics of the 4 wheel drive travel hydraulic system for special purpose machinery were analyzed using developed analysis program based on Simulation-X tool. From the parametric analysis, the effects of each factor were revealed. Through the simulation with varying parameters, the pressure compesated cotrol parameter effects on the control chrateristic and the pump pressure and load pressure variations were studied. The results were compared with the experimental ones. The results and discussions of the present paper could aid in the design of a 4 wheel drive travel hydraulic control system whith pressure compensated flow control function
굴삭기용 선회 모터의 가속시 소음 진동 개선을 위한 밸브 플레이트의 설계에 관한 연구
이승현(S. H. Lee),진정만(J. M. Jin),소순재(S. J. So) 유공압건설기계학회 2016 유공압건설기계학회 학술대회논문집 Vol.2016 No.11
Flow and pressure ripple in swash plate type piston motors is largely dependent on the design of notches. The basic design concept for notches in the valve plate could be said to be established for the general solution of flow and pressure ripple In this paper, it was lead theoretical formular to identify the major parameters caused the vibration and noise in the time of accelerating operation for swing motor and proposed the method of solution by return hole in notch of valve plate. also the effect for design of return hole in notch is prooved through the bench test considered inertio load according to excavator operating condition.
300마력 휠 로더용 가변식 사판 피스톤 펌프 로터리부 기본 특성 해석
이승현(S. H. Lee),김범환(B. H. Kim) 유공압건설기계학회 2016 유공압건설기계학회 학술대회논문집 Vol.2016 No.11
A modeling technique is proposed for dynamic simulations of swash plate axial piston pump. a simulation model of axial piston pump is used to Simulation-X software. In this paper, it was lead theoretical formular to identify the major parameters caused the flow and pressure ripple and also the effect of its parameter is showed through the simulation. it is able to be reduced flow and pressure ripple by notch of triangle type, but its more improvement is requested by another method.
원 펌프 4 륜 구동 주행 유압 제어 시스템에 대한 동조 특성 해석
이승현(S. H. Lee),김영렬(Y. R. Kim),이양수(Y. S. Lee) 유공압건설기계학회 2019 유공압건설기계학회 학술대회논문집 Vol.2019 No.11
In this study, the synchronized characteristics of the 4 wheel drive travel hydraulic control system for special purpose machinery were analyzed using developed analysis program based on Simulation-X tool. From the parametric analysis, the effects of each factor were revealed. Through the simulation with varying parameters, the pressure compensated control parameter effects on the control charateristics and the pump pressure and load pressure variations were studied. The results and discussions of the present paper could aid in the design of a 4 wheel drive travel hydraulic control system with pressure compensated flow control function