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가변 사판식 피스톤펌프의 맥동 변수 분석 및 최적 밸브플레이트 노치 설계를 위한 압력 및 유량맥동에 관한 연구
배준형(Jun-Hyeong Bae),정원지(Won-Jee Chung),장준호(Jun-Ho Jang),윤영환(Young-Hwan Yoon),전주열(Ju-Yeol Jeon) 한국생산제조학회 2015 한국생산제조학회지 Vol.24 No.2
We propose a simulation technique to estimate the reduction effect of the pressure/flow pulsation by analysis of the pulsation variables and notch shape of the valve plate of a swash-plate-type variable piston pump. First, using SimulationX<SUP>ⓡ</SUP>, we perform a theoretical kinematic analysis according to the variable swash-plate angle and rotational velocity in order to design a single-piston pump. In designing the notch shape of the valve plate of the swash-plate-type variable piston pump as one of the pulsation variables, we investigate the effect of the pulsation by comparing two notch types (circular type and V type). Then, we extend our analysis to a nine-piston pump model. This paper not only confirms the effect of the pressure/flow pulsation according to pulsation variables but can also be applied to the development of a SimulationX<SUP>ⓡ</SUP>-based simulation technique for notch-shape optimization for a swash-plate-type variable piston pump.
사판식 피스톤 펌프의 밸브 플레이트 설계와 예압에 따른 맥동
사진웅(Jin-Woong Sa),정원지(Won-Jee Chung),배준형(Jun-Hyeong Bae),이정민(Jeong-Min Lee) 한국생산제조학회 2016 한국생산제조학회지 Vol.25 No.1
This study investigated the design factors of the opening area in order to consider the kinematic stability of a valve plate, conducting an analysis of the reduction effects of pressure pulsation and flow ripple depending on the design factors, using the SimulationX<SUP>Ⓡ</SUP> (Germany) hydraulic analysis program. Further, we performed a structure analysis to confirm the kinematic stability of the valve plate in a swash plate type piston pump, and analyzed the effects of pulsation on a 1-step V–type notch, 2-step V-type notch, and 2-step U-type notch to determine the effects of pulsation reduction. Finally, we show the effectiveness of our proposed design of the pre-compression sections on a valve plate in terms of low pulsation by using the hydraulic analysis program, SimulationX<SUP>Ⓡ</SUP>.
On the Instantaneous and Average Piston Friction of Swash Plate Type Hydraulic Axial Piston Machines
Jeong, Heon-Sul,Kim, Hyoung-Eui The Korean Society of Mechanical Engineers 2004 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.18 No.10
Piston friction is one of the important but complicated sources of energy loss of a hydraulic axial piston machine. In this paper, two formulas are derived for estimating instantaneous piston friction force and average piston friction moment loss. The derived formula can be applicable for piston guides with or without bushing as well as for axial piston machines of motoring and pumping operations. Through the formula derivation, a typical curve shape of friction force found from several experimental measurements during one revolution of a machine is clearly explained in this paper that it is mainly due to the equivalent friction coefficient dependent on its angular position. Stribeck curve effect can easily be incorporated into the formula by replacing outer and inner friction coefficients at both edges of a piston with the coefficient given by Manring (1999) considering mixed/boundary lubrication effects. Novel feature of the derived formula is that it is represented only by physical dimensions of a machine, hence it allows to estimate the piston friction force and loss moment of a machine without hardworking experimental test.