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윤영환(Y. H. Yoon),장주섭(J. S. Jang),이용범(Y. B. Lee) 유공압건설기계학회 2012 유공압건설기계학회 학술대회논문집 Vol.2012 No.6
A modeling technique is proposed for dynamic simulations of swash plate axial piston pump. A dynamic model of Axial piston pump is used to SimulationX software. SimulationX, multi-domain simulation and modeling tool for the design, analysis, and optimization of complex systems. This papers modeling of a hydralic axial piston pump with SimulationX and complete model of an axial piston plate pump with 9 elements combined with 3D-animation. The MBS(Multi Body System) part of the model is more for animation even the piston masses are physical models. Only the piston block is an animation body. This model is to show the hydraulic network. There are no centrifugal effects at pistons or barrel included. SimulationX modeling physical systems based on libraries of basic elements is the key for rapid prototyping and modeling. The purpose of this papers is to give a framework to SimulationX users to model an axial piston pump. Some of the results obtained are perhaps different from a real device and now the work of the component designer to adjust the different parameters and the variable edges, the design parameters of the piston, swash plate control parts and so forth.
임태형(T. H. Lim),오병수(B. S. Oh),이홍선(H. S. Lee),양순용(S. Y. Yang) 한국정밀공학회 2006 한국정밀공학회 학술발표대회 논문집 Vol.2006 No.5월
The purpose of this paper is pulsation-analysis of the swash plate type axial piston pump for excavator and the method of side branch hose application, which is used normally in construction equipments. In this paper, draw the mathematical modeling for pressure pulsation mechanism of the swash plate type axial piston pump for excavator, expression the flow pulsation in the pipelines by transfer matrix method, programmed simulation for pulsation by AMEsim software, and the reliability of that was verified by the comparison with the experimental results.
SimulationX<SUP>Ⓡ</SUP>를 이용한 가변 사판식 액셜 피스톤 펌프의 밸브플레이트 노치 최적화에 관한 연구
이산성(San Seong Lee),정원지(Won Jee Chung),임동재(Dong Jae Lim),차태형(Tae Hyung Cha),김수태(Soo Tae Kim),이정실(Jeong Sil Lee),최경신(Kyung Shin Choi) 한국기계가공학회 2018 한국기계가공학회지 Vol.17 No.4
Considering the shape of a valve plate in design is important for reducing the pulsation phenomenon, which is a negative factor in pump performance. The purpose of this study is to propose an optimized method for a valve-plate V-type notch of a piston pump by modeling and simulation. The method uses SimulationX<SUP>Ⓡ</SUP>, a commercial hydraulic analysis program, and to provide data for the designing of the notch. The opening areas are determined by performing kinematic analysis of the notch part where the opening area changes rapidly. After applying the result analysis, the main effects on maximum pressure pulsation and maximum backflow according to the notch design factors are analyzed by using the full factorial method of experimental design. The optimized solutions are derived for the notch design variables, based on the analyzed data.
사판식 피스톤 펌프의 피스톤 회전 반경에 따른 윤활 특성
조인성(Ihn Sung Cho),정재연(Jae Youn Jung) Korean Society for Precision Engineering 2013 한국정밀공학회지 Vol.30 No.7
Hydraulic systems are used to transform mechanical energy and fluid energy into each other. Its applications are very wide over the whole industries such as automobiles, public works, rockets, machine tools, construction heavy equipments, airplaces and so on. They are hydraulic pumps that transform energy in the systems. In this study, with basic operation principles as a start point, I tried to understand how the rotating radius of a piston affects the lubrication characteristics in more practical conditions, a swash-plate with tilt angle zero capable of rotating motion and other devices was used. In this paper, a slipper was located on 45mm eccentricity from the center of a swash-plate. As a result, through this experiment, it was found that the rotating radius of a piston affects load capacity, leakage flow and lubrication characteristics and it is one of the important parts for improving the pump efficiency.
EHA 펌프용 피스톤 슈 정압베어링의 경계 마찰 성능 개선
홍예선(Y. S. HONG),권용철(Y. C. Kwon),김종혁(C. H. Kim),이성렬(S. L. LEE),김병곤(B. K. Kim),문진삼(J. S. Moon),김재환(J. H. Kim) 유공압건설기계학회 2014 드라이브·컨트롤 Vol.11 No.2
The pumps of electro-hydrostatic actuators operate most frequently in boundary lubrication speed range, as they compensate for the position control errors as a control element. When conventional swash plate type piston pumps are applied to electro-hydrostatic actuators, the frictional power losses as well as the wear rate of sliding components, such as piston shoes can increase drastically under the boundary friction condition. In this paper, the power losses of the piston shoes were investigated which were engendered by a frictional solid-to-solid contact and leakage flow rate of their hydrostatic bearing. In order to reduce them, DLC-coating was applied to the swash plate and the ball joint of pistons along with its effects were demonstrated. In addition, it was also shown that the wear rate of the piston shoes could be markedly reduced using the DLC-coated swash plate.
DLC 코팅에 의한 사판식 피스톤 펌프의 저속 영역 동력 손실 개선
홍예선(Y. S. Hong),김종혁(J. H. Kim),이성렬(S. L. Lee) 유공압건설기계학회 2014 드라이브·컨트롤 Vol.11 No.4
This paper details application of a DLC(Diamond Like Carbon)-coating to the swash plate and the ball joint of pistons that make sliding contact with the piston shoes of an axial piston pump. This process, aimed to reduce the frictional and leakage power losses of the hydrostatic piston shoe bearings at the low speed range. At lower speeds than 100rpm, the positive effects of the DLC-coating on the power loss reduction of the hydrostatic piston shoe bearings could be confirmed. These effects resulted in little improvement in volumetric efficiency of the test pump, but the mechanical efficiency could be raised by up to 5% at 100rpm; here, the DLC-coated swash plate played a more dominant role than the DLC-coated ball joint.
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.
두 개의 EPPR 밸브가 적용된 정/역 가변형 사판식 액셜 피스톤 펌프 시스템 모델링
김용길(Yong-Gil Kim),김수태(Soo-Tae Kim),함영복(Young-Bog Ham),윤소남(So-Nam Yun),손호연(Ho-Yeon Son) 유공압건설기계학회 2020 드라이브·컨트롤 Vol.17 No.1
This study addresses the modeling of a bi-directional outlet variable swash plate type axial piston pump with two EPPR valves and an analysis of the response characteristics to the angle control of that pump. In this paper, the combination of the EPPR valve and double rod type piston is referred to as the EPPR regulator. The EPPR regulator is compact and inexpensive, and has good responsiveness. Under actual pump operating conditions, because of the various external conditions of the pump, inertia is applied to the swash plate, generating the tilting torque. Also, the tilting torque can delay or shorten the response characteristics of the regulator. So we validated them through the analysis using SimulationX and these results allow users to freely integrate the EPPR regulator into the desired system.
사판식 유압 피스톤 펌프의 슬리퍼와 사판 간의 윤활 특성
조인성(Ihnsung Cho) 한국트라이볼로지학회 2013 한국트라이볼로지학회지 (Tribol. Lubr.) Vol.29 No.3
Hydraulic systems are used to transform mechanical energy into fluid energy and vice versa. They are widely applied in various industries; e.g., they are used in automobiles, public works, rockets, machine tools, heavy construction equipment, and airplanes. Hydraulic pumps are used to transform the energy in these systems. In this study, with the basic operation principles as a starting point, I attempted to clarify how the shape of a slipper affects the lubrication characteristics under practical conditions. A swashplate with a tilt angle of zero and capable of rotating motion was used, along with other devices. A slipper was located at 45 mm eccentricity from the center of the swashplate. The results of this experiment indicated that the shape of the bottom surface of a slipper affects the load capacity, leakage flow, and lubrication characteristics and that the slipper is one of the most important parts for improving the pump efficiency.
다물체 동역학 프로그램을 이용한 등속조인트와 피스톤 로드 방식을 적용한 사판 식 유압 피스톤 모터의 사판에 대한 토크 해석
정헌술(H. S. Jeong),장진현(J. H. Jang),함영복(Y. B. Ham),김당주(D. J. Kim) 유공압건설기계학회 2017 유공압건설기계학회 학술대회논문집 Vol.2017 No.11
Recently, swash plate type hydraulic axial piston motor are being extensively used in the world, because of simple design, light weight and effective cost. Structural problem of the swash plate type motor is that tilting angle of swash plate should be limited to relatively small value and lateral force on pistons has an undesirable effect in reciprocating motion. To solve these problems, piston rod mechanism, which is commonly used in bent axis type motor is considered to be applied to the swash plate type motor. In this paper, the torque for the swash plate motion of a swash plate hydraulic motor with constant velocity joint and piston rod mechanism is analyzed using mathematical modeling and Virtual.lab, a multibody dynamics analysis program.