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최세령(S. R. Choi),이일영(I. Y. Lee) 한국동력기계공학회 2008 한국동력기계공학회 학술대회 논문집 Vol.2008 No.11
A flow control valve(F.C.V.) in a submerged cargo pumping system(S.C.P.S) for chemical tankers has notable features in its handling flow rate and operational principle. This paper suggests a simulation model for the hydraulic system including the F.C.V. Numerical simulation results and experimental results are compared with each other, and the validity of the simulation model is verified. The suggested simulation model is expected to be used in designing F.C.V.s for S.C.P.S. in various liquid cargo ships.
문준혁(J. H. Mun),이일영(I. Y. Lee),최세령(S. R. Choi),지상원(S. W. JI) 유공압건설기계학회 2018 유공압건설기계학회 학술대회논문집 Vol.2018 No.6
Hydraulic systems are used mainly because the steering gear requires a large power source from the ship`s operation as a key drive that enables the setting and operation of the course. The hydraulic steering is divided into a swash plate control method of a hydraulic pump and a hydraulic valve control method according to a driving method, and classified into a ram and a vane type according to the steering unit. In this study, we construct a simulation model using AMESim S/W and analyze the characteristics of the basic steering system. Also, operation performance and energy efficiency are analyzed according to the steering system. Through analysis of the steering system, the problem of the existing steering system is finally analyzed and the steering is optimally designed.
다중 토출 레이디얼 유압 피스톤 펌프의 압력 맥동 특성
최세령(S. R. Choi),임종철(J. C. Lim),이일영(I. Y. Lee) 유공압건설기계학회 2014 드라이브·컨트롤 Vol.11 No.2
In this study, the authors carried out experiments and numerical simulations in order to clarify the pressure pulsation characteristics in multiple-delivery rotating-cam and stationary-cylinder type radial piston pumps. Also, a tee filter was applied to the pump in order to mitigate the pressure pulsation. Through the experiments and simulations, it was known that pressure pulsation with a magnitude higher than 40% of the mean load pressure could occur in the pump used in the experiments. Moreover, it was confirmed that a tee filter designed in this study could effectively mitigate the pressure pulsation.
액시얼 피스톤 펌프(피스톤수 짝수형)에서 맥동저감라인 설계 및 성능 평가
최세령(S. R. Choi),이일영(I. Y. Lee),지상원(S. W. Ji) 유공압건설기계학회 2018 유공압건설기계학회 학술대회논문집 Vol.2018 No.11
Axial Piston Pumps are generally designed with an odd number of pistons in trying to reduce kinetic flow ripple, however, they are also designed with an even number of pistons for more effectiveness in the pulsation reduction design. In this paper, a pulsation reduction line is designed with no check valve by arranging a cylinder block notch for the pumps with an even number of pistons. By adding notches to the outer circumferential direction of the cylinder blocks, it produces a separate path from the existing discharge and suction ones. Also, PRL connection angle is designed in accordance with the shape of cylinder block notch. From an experiment to study the pressure pulsation & volumetric efficiency by using the commercial pumps with 10 pistons, the performance of PRL which used the cylinder block notch was verified by showing significant reduction in flow ripple.
엑시얼 피스톤 펌프의 압력/유량 맥동 시뮬레이션에 관한 기초적 연구
최세령(S. R. Choi),신상균(S. S. Shin),이일영(I. Y. Lee),장동혁(D. H. Jang),권정호(J. H. Kwon) 유공압건설기계학회 2010 유공압건설기계학회 학술대회논문집 Vol.2010 No.10
This study suggests the numerical model of an axial piston pump focusing on pressure and flow ripple analysis. using the numerical model, simulation programs for analysing pressure and flow ripple in the pump are shown. the effectiveness of the simulation programs are verified by comparative considerations of the simulation results and experimented results. Effects of several physical parameters on simulation accuracy are investigated.
최세령(S. R. Choi),이일영(I. Y. Lee) 유공압건설기계학회 2017 유공압건설기계학회 학술대회논문집 Vol.2017 No.11
In general, a axial piston pump consists of an odd number of pistons (7 or 9). It is known that the amplitude of the flow pulsation decreases when the number of pistons is an odd number. In this paper, flow pulsation characteristics are simulated by varying the number of pistons. From the simulation results, we design a new axial piston pump with an even number of pistons that does not require a check valve.
레이디얼 피스톤 펌프에서 압력/유량 맥동의 실험 및 수치적 검증
최세령(S. R. Choi),이일영(I. Y. Lee),임종철(J. C. Lim) 유공압건설기계학회 2012 유공압건설기계학회 학술대회논문집 Vol.2012 No.6
In the beginning of this study, pressure in a cylinder and flowrate from a cylinder of a rotating-cam and fixed-cylinder type radial piston pump are investigated through numerical simulations, so that the simulation results might be utilized as basements for examining physical phenomena occurring in the pump assembly. Then, for supplying basic knowledge on pump design, pressure and flow characteristics of a pump assembly under the variations of major design parameters are investigated through numerical simulations. Through the simulations, it is shown that the simulation program suggested in this study can be utilized for the design of the radial piston pump.
최세령(S. R. Choi),임종철(J. C. Lim),이일영(I. Y. Lee) 유공압건설기계학회 2013 유공압건설기계학회 학술대회논문집 Vol.2013 No.6
Multi-delivery type radial piston pump is a special type of radial pump. In The multi-delivery type pump, unlike general radial piston type pumps, each piston delivers fluid to the actuator that is separately alloted to the piston. During period of the piston actuation, i.e. a suction stroke, there is no fluid delivery from the piston. And also even during the delivery stroke, the piston speed varies with sinusoidal pattern. Therefore, severe pressure pulsation may arise in the delivery lines. In this study, the authors investigate the mechanism of pressure pulsation in the pump through experiments and simulations. In addition, try the application of a pulsation filter to mitigate pulsation.
연속 접촉 헬리컬 기어펌프의 수치해석 연구: 모델 개발 및 적용
장호성(H. S. Jang),박민규(M. G. Park),성준영(J. Y. Seong),양경욱(K. U. Yang),최세령(S. R. Choi),지상원(S. W. Ji) 유공압건설기계학회 2022 유공압건설기계학회 학술대회논문집 Vol.2022 No.06
External gear pump(EGP) has a simple structure and excellent durability among hydraulic pumps, so they are generally used in hydraulic control system and fuel transfer system. However, in an involute tooth type pump, a volume trapped between the gear teeth is formed during two-point contact, and as a result pressure pulsation, vibration, and noise are generated, thereby deteriorating volumetric efficiency. To compensate for these shortcomings, a continuous contact helical gear pump(CCHGP) has been proposed and has been commercialized recently. Advantages have proven to be of great benefit in terms of reduced flow and pressure pulsations, as well as noise reduction due to the absence of entrapped volumes. However, unbalanced thrust occurs and manufacturing is difficult, so related research is insufficient. In this paper, continuous contact gear teeth were designed, and flow analysis was performed using a commercial program (SimericsMP+) to shape continuous contact helical gear teeth. We present a numerical approach to predict flow and pressure pulsations and pump performance by applying cavitation and turbulence.