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백일현(I. H. Baek),바드랄철몽(T. M. Badral),조인성(I. S. Cho),정재연(J. Y. Jung),오석형(S. H. Oh) 유공압건설기계학회 2009 유공압건설기계학회 학술대회논문집 Vol.2009 No.11
On the power steering system of the automobile, the balanced type fixed displacement vane pump is principally applied to the main pump. In this pump, it is important to the pressure compensated type flow control valve. For the flow control valve controls the flow rate which needed to operate the actuatro, it has the pressure compensator that kept the pressure difference between the foward and rear position of the orifice constantly. When the inlet flow is proportionally increased by rotational velocity, the controlled flow is passed to the orifice but the overflow is bypassed to the inlet prot of cartridge by return spool. Therefore, in this paper, th theoretical simulation to parameters affected to the flow control had performed. The results show that the impact factors such as the orifice area, the spring stiffness, and the initial force exert a influence on the flow control valve characteristic of the balanced type fixed displacement vane pump.
서중산 ( J. S. Suh ),이관섭 ( K. S. Lee ),장기택 ( K. T. Jang ),한태호 ( T. H. Hahn ),백광호 ( G. H. Baik ),백일현 ( I. H. Baek ),박현주 ( H. J. Park ),박상훈 ( S. H. Park ),김종혁 ( J. H. Kim ),박충기 ( C. K. Park ) 대한소화기학회 2002 대한소화기학회 춘계학술대회 Vol.2002 No.-
〈목적〉 충수돌기의 게실은 발병율이 0.004-2.1%로 알려져 있으며 이러한 충수돌기의 게실에 생기는 게실염은 더 드문 것으로 보고되고 있다. 그러나 최근 급성복증환자에서 복부초음파로 대부분의 충수돌기 게실염 환자에서 수술전 진단이 가능해 졌고 이로 인한 진단예가 증가하고 있다. 이에 저자들은 충수돌기 게실염에서 복부초음파의 소견과 충수돌기 게실염환자들의 특성을 조사하였다. 〈방법〉 2000년 3월부터 2001년 6월까지 진단되어 수술하였던 13예에서
파워스티어링용 유압 베인펌프의 트라이볼로지적 특성에 관한 연구
조인성(I. S. Cho),백일현(I. H. Baek),김지홍(J. H. Kim),정재연(J. Y. Jung),송규근(K. K. Song) 한국트라이볼로지학회 2004 한국트라이볼로지학회 학술대회 Vol.38 No.-
The lubrication characteristics of line contact between the vane and the cam-ring have been investigated in an hydraulic vane pump for power steering system. This paper is aimed at obtaining the friction force and the coefficient of friction between the vane and the cam-ring of hydraulic vane pump. The coefficient of friction is obtained by measuring the friction force in the contact region between the vane and the cam-ring. First, in order to obtain the friction force and the coefficient between the vane and the cam-ring, the acting normal force applied to the vane should be gained. This force can be calculated by summing up the inertial force of the vane, the viscosity force caused by oil and the hydraulic force occurred by pressure of the oil. In this paper, the experiment has been modeled to real condition between the vane and the cam-ring. The load is applied by the servo valve controlling the pressure of the hydraulic cylinder. Friction force is measured by the load cell attached to the vane-supporting arm. The signals measured by the force sensor go through an A/D converter and are then processed by a personal computer. In the paper, following results were obtained. Firstly, the more deliver pressure increases, the more friction force increases but the coefficient of friction decreases between the vane and the cam-ring. Secondly, we see that the region of lubrication between the vane and the cam-ring exists on the regime of the mixded lubrication and hydrodynamic lubrication.
고 - 기 화학열변환기의 최적설계 및 성능해석에 관한 연구
최승훈,이세일,백일현,최익수 ( S . H . Choi,S . I . Lee,I . H . Baek,I . S . Choi ) 한국공업화학회 1997 공업화학 Vol.8 No.5
산업폐열을 활용하기 위해 금속염화물-암모니아계 화학열변환기를 설계하고 IkW-1hr 용량의 장치개발을 하였다. 이는 170℃ 열원을 210℃ 이상으로 승온시키는 화학열펌프 시스템으로서, 효율적인 화학반응기의 설계를 위하여 필요한 반응물의 양과 반응물의 조건 등을 산출하는 정적계산과 동적모사를 수행하였다. 모사결과 열교환면적이나 반응기내 염의 양 등의 변수에 따라 시스템의 온도와 출력이 변함을 알 수 있었고 또한 반응물질의 양과 겉보기밀도 및 장치구조의 영향을 고찰하고 최적조건을 결정할 수 있었다. 4단계 작동사이클에 따라 운전한 결과 온도 및 출력의 실험치는 모사치와 비교하여 양호한 결과를 얻었으며 이 화학열변환기는 일정온도로 승온시킬 수 있는 특징으로 인해 앞으로 산업공정에서 배출되는 폐열원을 활용할 수 있는 시스템으로서의 가능성을 확인하였다. For the recovery of industrial waste heat, a chemical heat transformer based on the reversible reactions between metal chlorides and ammonia gas was designed and a pilot scale unit of 1 kW-1hr was developed. A static calculation, which determined the amount of reacting materials and operating condition of system, and dynamic simulations were performed for the optimal design. The temperature and output power of generator in the system were varying with the amount of salt and heat exchange area. Optimum conditions such as the amount of salt-graphite, apparent density and size of mechanical unit were determined by the dynamic simulation for the system. According to the operating cycle of 4 stages, experimental results of temperature and output power were well agreed with the simulation values. This chemical heat transformer is turned out to be a very promising system for recovery of industrial waste heat because of its effective feature of lifting temperature.
사판식 유압 피스톤 펌프의 실린더블록과 밸브 플레이트의 응력해석
김지홍(J. H. Kim),조인성(I. S. Cho),백일현(I. H. Baek),정재연(Jae-Youn Jung),오석형(Suk-Hyung Oh) 한국트라이볼로지학회 2004 한국트라이볼로지학회 학술대회 Vol.39 No.-
Recently, the technologies related to the swash plate type oil hydraulic piston pump are requiring extreme technologies to overcome the limit of high efficiency in cope with high speed and pressure, and are devoted to compact the unit, to gain low noise level, and to adopt electronic technologies, and the question regarding to maximize the mechanical efficiency, that is, to minimize the torque loss by minimizing the leakage loss in the relative sliding region but these are in trade-off relation that tribological responding is very difficult. Cylinder block-valve pate in high speed relative sliding motion has the characteristics that shoud be extremely controlled for the optimization of these leakage loss and mechanical efficiency, and pressure resistance designing of them is important for high pressure performance. But, studies on the stress analysis of these parts have not been performed briskly, so in this paper the stress distribution and the region where the highest displacement appears are described through the static stress analysis using CATIA V5. Through the future studies on these theme, it has the purpose of finding the suitable materials for the other parts as well as cylinder block and valve plate, in cope with high pressure operation through the stress analysis with the most similar conditions for the practical operation.