• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 1992년도 춘계학술대회 논문집
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• pp.335-340
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• 1992

유압 시스템(System)은 원동기의 기계적 에너지를 유압펌프가 작동유를 압력 에너지의 형태로변환 시켜 이것을 유합 실린더(Cylinder)등의 엑츄에이터(Actuator)가 다시 기계적 에너지로 변환시켜 부하 를 구동하게한다. 상용차(NT-1, KH 등)용 파워스티어링(Power Steering)에 장착되는 Vane Type Oil Pump (이하 VOP)가 바로 이와같은 역할을 담당하고 있다. 본 연구에서는 VOP의 성능과 관련되어지는 주요 제원(Parameter)인 미끄럼부에서의 틈새, 작동유점도, 압력변화, 회전수 등을 다양하게 변화시키는 모의실험(Simulation)을 통하여각각의 조건하에서얻어지는 누설 유량과 체적효율을 수치적 으로 예측하고 이것을 주요제원을 고려하여 해석해서 정량적인 값을 얻는 것을 목적으로한다.

• 대한기계학회:학술대회논문집
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• 대한기계학회 2007년도 춘계학술대회B
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• pp.3323-3328
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• 2007

Conventional LPG pump for Liquified Petroleum injection(LPi) engine has been adopted vane type. But the BLDC type fuel pump for LPi system has complicated structure and its price is high. Therefore, as a alternative, this study has mainly focused on the development of turbine type LPG pump which has lower cost and simple structure than conventional BLDC type. To verify the possibility of substitute the performance tests were performed for each fuel pump. The comparative items were pressure settling time, variation of fuel outlet temperature and engine performance of hot restart ability. As a result, performances of turbine type LPG pump were equivalent or high comparing to the BLDC type all over the tests for different fuel composition.

• Tribology and Lubricants
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• 제23권5호
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• pp.234-239
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• 2007

Recently one of the automobile customer's greatest concerns is quietness in a vehicle along with various functional requirements such as comfort, stability, mobility etc. Therefore car makers place more weight on vehicle noise. Especially, in the case of diesel engine, as the noise level of engine becomes more silent by the development of engineering technology. The noise of alternator with vacuum pump has been able to be noticed enough becoming an issue on vehicles. In this study vacuum pump noise on alternator was identified andclassified into five types. DOE was applied to induce the statistical analysis result to reduce the vacuum pump noise. It was done by subjective listening. Design and statistical analysis are done with Minitab software. This work provides dominant elements of vacuum pump noise on alternator and can be the basis of furture studies.

• Tribology and Lubricants
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• 제13권1호
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• pp.14-20
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• 1997

This paper reports on theoretical study of the pressure overshoot in the delivery ports and pressure rising within balanced type vane pump. Pressure overshoot occur due to the accelerated fluid through the notch, so, result in pressure ripple, flow ripple, and noise. For calculating the pressure rising and fluctuations of pressure, we have modeled mathematically used continuity equation based on compressibility and momentum equation considered fluid inertia in the notch, and analyzed simultaneously. As a results of analysis, we have found oscillation of pressure and compression chamber pressure depend on the rotational speeds, notches. Using the model, notches have been shown to be important design factor in relaxing the rapid pressure rising and reducing the amplitudes of pressure overshoot.

• 로봇학회논문지
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• 제18권4호
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• pp.456-462
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• 2023

In recent years, the use of robot arms has increased rapidly in both industrial and service applications. Unlike production sites, where only one type of gripper is used for productivity, service sites often use a tool changer to replace fingered grippers or vacuum grippers to cover various objects to be grasped. To this end, a tool changer-based pneumatic grasping system was developed in this study. In order to simultaneously use a positive pressure-based pneumatic gripper and a negative pressure-based vacuum gripper, a small vane pump capable of generating positive and negative pressures depending on the direction of rotation was developed. Experiments with actual prototypes have shown that the pneumatic system based on the developed vane pump can effectively realize both pneumatic grippers and vacuum grippers.

• 한국유체기계학회 논문집
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• 제6권2호
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• pp.29-33
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• 2003

The periphery pump (or regenerative pump) has been generally applied in the automotive fuel pump due to their low specific speed (high heads and small flow rate) with stable performance curves. In this study, the performance prediction of side channel type periphery pumps has been developed. The prediction of the circulatory flow rate is based on the consideration of the centrifugal force field in the side-channel and in the impeller vane grooves. For the determination of performance curve (head-flow rate), momentum exchange theory is used. The effects of various geometric parameters and loss coefficients used in the performance prediction method on the head and efficiency are discussed, and the results were compared with experimental data.

• 대한기계학회:학술대회논문집
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• 대한기계학회 2002년도 학술대회지
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• pp.581-584
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• 2002

The periphery pump(or regenerative pump) has been generally applied in the automotive fuel pump due to their low specific speed(high heads and small flow rate) with stable performance curves. In this study, the performance prediction of side channel type periphery pumps has been developed. The prediction of the circulatory flow rate is based on the consideration of the centrifugal force field in the side-channel and in the impeller vane grooves. For the determination of performance curve(head-flow rate), momentum exchange theory is used. The effects of various geometric parameters and loss coefficients used in the performance prediction method on the head and efficiency are discussed and the results were compared with experimental data.

• 설비공학논문집
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• 제11권2호
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• pp.193-204
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• 1999

Performance of a variable-speed, roller-type vane compressor was evaluated at low evaporating temperature. First, an experimental investigation was conducted to examine the performance variation as functions of both outdoor temperature and rotating speed. For this purpose, a typical heat pump was implemented as a test apparatus to measure mass flow rate and power input. Secondly, computational investigations corresponding to the heat pump test conditions were performed to predict compressor performance using ORNL Map-Based compressor model. Results obtained from the heat-pump experiments showed that both mass flow rate and power consumption were sensitively dependent on both evaporating temperature and compressor speed as was predicted from the computational results. From the comparisons of both experimental and computational results, it was well recognized that the ORNL model was subjected to larger error in the accuracy of prediction as outdoor temperature decreased. When the outdoor temperature was above $-5^{\cire}C$, errors of predicted values corresponding to both mass flow rate and power consumption were estimated as $\pm$10% and $\pm$ 15%, respectively. Finally, it is suggested that the ORNL model needs to be re-evaluated if compressor map data tested below $-5^{\cire}C$(in evaporating temperature) are available.

• 한국유체기계학회 논문집
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• 제13권1호
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• pp.17-22
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• 2010

In this paper, numerical study on a mixed-flow pump for irrigation and drainage has been performed based on three-dimensional viscous flow analysis. Reynolds-averaged Navier-Stokes equations with shear stress transport turbulence model are discretized by finite volume approximations and solved by the commercial CFD code ANSYS CFX-11.0. A structured grid system is constructed in the computational domain, which has O-type grids near the blade surfaces and H/J-type grids in other regions. The numerical results were validated with experimental data for the heads and efficiencies at different flow coefficients. The efficiency at the design flow coefficient is evaluated with the variation of two geometric variables related to area of discharge and length of the vane in the diffuser. The results show that efficiency of the mixed-flow pump at the design flow coefficient is improved by the modifications of the geometry.

• 항공우주시스템공학회지
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• 제14권1호
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• pp.1-7
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• 2020

본 논문은 국내 최초로 독자기술로 개발된 항공기용 연료이송펌프의 기어부를 설계하는 일련의 절차 및 그 결과에 대한 것이다, 기어펌프 방식이 베인펌프 방식에 비하여 전반적 성능이 우월하고, 내부 누설이 소량으로, 연료이송펌프의 설계에 필요사항에 부합하여 이 방식이 선정되었다. 기어 하우징은 흐름을 결정하는 중요한 변수인데, 기어의 외경을 고려하여 적절한 여유공간을 갖도록 설계하였다. 아울러, 모터가 연료이송펌프를 구동하기 위해 필요한 공압 및 축동력 등도 계산하였다.