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풍력 열발생 유압 시스템을 위한 새로운 유량제어밸브에 관한 연구
최세령(Sae Ryung Choi),이일영(Ill Yeong Lee),한봉준(Bong Jun Han) 유공압건설기계학회 2017 드라이브·컨트롤 Vol.14 No.1
A wind power heat generation system that converts wind power directly to heat instead of electric power is considered in this study. The system consists of a wind turbine part and a heat generation part. The heat generation part is materialized by a hydraulic system including a hydraulic pump, a flow control valve, a hydraulic oil tank, etc. The flow control valve primarily converts hydraulic energy generated in the pump to heat energy. It should have a function of overspeed protection under excessive wind speeds. In this study, a novel flow control valve design is proposed for excellent flow control characteristics under excessive pump driving torque (excessive wind speed). The performance of the suggested valve is analyzed using numerical simulation.
양방향 구동 사판식 액시얼 피스톤 펌프의 밸브 플레이트 노치 설계에 관한 연구
최세령(Sae Ryung Choi),이일영(Ill Yeong Lee),한성민(Sung Min Han),신정우(Jung Woo Shin) 유공압건설기계학회 2016 드라이브·컨트롤 Vol.13 No.3
Flow and pressure ripple in swash plate type piston pumps is largely dependent on the design of notches(silencing grooves) in the valve plate. In uni-directional pumps, the basic design concept for notches in the valve plate could be said to be established. It is easily deduced that the design concept for notches in uni-directional pumps can not be simply applied to bi-directional pumps requested for EHA(electric hydrostatic actuators). To carry out systematic research on technological issues regarding notch applications to bi-directional piston pumps, five notch designs are devised. The effects of the notch designs on the characteristics of the pump are investigated by numerical simulations and experiments. Through this study, basic concepts about notch design for bi-directional piston pumps are suggested.