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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.
이일영(I.Y.Lee),정윤규(Y.K.Jung),송상훈(S.H.Song),정용길(Y.K.Jung),윤영한(Y.H.Yoon) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.11_1
The purpose of this study is to investigate the dynamic characte istics of a hydraulic pump and pipeline system for a vehicle active suspension system by theoretical analyses and experiments. The research achievement car to applied to pipeline design for effective attenuation of pressure fluctuations.<br/>
이일영(I. Y. Lee),강만곤(M. G. Kang) 한국동력기계공학회 2006 한국동력기계공학회 학술대회 논문집 Vol.- No.-
The speed of sound in fluid is one of the most important parameters in the analytical prediction of the dynamic characteristics and performance of fluid power pipe systems. First, in this study a summary of several existing methods for measuring the speed of sound in the fluid in a pipe is presented. Their basic principles, advantages and limitations are compared. To improve old method's limitations, the author suggests a far simple measuring method of speed of sound in hydraulic pipe systems. The speed of sound in hose is obtained as data in frequency series. The computed results are compared with the experimental ones, and the validity of the new procedure to obtain speed of sound in hose is confirmed.
파일럿 밸브가 주 스풀에 동심 내장된 2단 반향/유량 제어밸브의 특성
이일영(I. Y. Lee),손제목(J. M. Son) 유공압건설기계학회 2010 유공압건설기계학회 학술대회논문집 Vol.2010 No.10
This study suggests the numerical model of a two stage directional/flow control valve with the main spool having a coaxially built-in pilot spool. Through numerical simulations and experiments, the characteristics of the valve under the steady state operation and dynamic operation are investigated. In addition, effects of some design parameters on the valve performances are shown.