• Transactions of the Korean Society of Mechanical Engineers A
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• v.34 no.10
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• pp.1437-1442
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• 2010

A slipper metal is used for power transmission in the aluminum hot rolling process. The slipper metal connects a spindle with a coupling. Therefore, if the slipper metal is seriously damaged, the spindle and the coupling will crash into each other. Therefore, preventing the destruction of the slipper metal is essential for ensuring a long mechanical life cycle. In this study, the structural analysis and optimal design of the slipper metal was carried out by finite element method for life extension of the slipper metal. To verify the interference of spindle assembly with modified slipper metal, a kinematics simulation was performed by applying various combinations of dynamic boundary conditions. As a result of structural analysis and optimal design of the slipper metal, the maximum stress of the modified slipper metal was lower than that of the initial model by 22%.

• Journal of Drive and Control
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• v.9 no.4
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• pp.71-78
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• 2012

• Journal of Drive and Control
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• v.10 no.1
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• pp.14-20
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• 2013

In the high rotational speed and pressure state, the leakage flow rate of the axial piston pump is one of the serious problems and make great reasons to decrease the volume efficiency. In this study, tribology characteristics is clarified for the hydrostatic slipper bearing in the swash plate type axial piston pump, by means of theoretical analysis for the different shape of the hydrostatic slipper bearing. It was analyzed by Mathcad software and used equal conditions at $0^{\circ}$ swash plate angle in each model. The results show that performance characteristics of the swash plate type axial piston pump are significantly influenced by the shape of the hydrostatic slipper bearing.

• Tribology and Lubricants
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• v.29 no.3
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• pp.186-191
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• 2013

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.

• Journal of Ocean Engineering and Technology
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• v.23 no.5
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• pp.39-44
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• 2009

The hydrostatic slipper bearing is generally used in high pressure axial piston pumps to support the load generated from two surfaces which are sliding relatively at low speed. The object of the bearing is to remove the possibility of direct contact by maintenance of an adequate oil film thickness between two metal surfaces. Because the bearing performance is influenced by the bearing deformation, it is highly dependent on the injection pressure, the bearing surface profile and so on. In this study, the deformation characteristics of a hydrostatic slipper bearing is investigated according to the injection pressure by the finite element analysis. In the analysis, the special boundary condition to take the fluid-structure interaction (FSI) into account is used on the interactive surface. The results, such as bearing deformation, stress and lifting force, obtained from the fully coupled analysis are compared with those from the single step sequential method.

• Transactions of The Korea Fluid Power Systems Society
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• v.4 no.3
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• pp.1-6
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• 2007

The leakage generated from the clearance between the cylinder bore and the piston is one of the most serious problems in the hydraulic piston pump, and it even results in terrible decrease of the volume efficiency at a great velocity and high pressure. In this paper, the lubrication characteristic of the hydrostatic slipper bearing equipped in the hydraulic piston pump has been worked out by experimentation with three model bearings of different shape. Preparatory to this, not only the three models of piston-slipper were designed, but the corresponding experimental apparatus were also manufactured. As a result, it was verified that, according to the supply pressure, the hydrostatic bearing part of the slipper is severely affected by the pocket pressure, land pressure, oil film thickness, and leakage flow.

• Journal of Power System Engineering
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• v.16 no.1
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• pp.5-11
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• 2012

In this paper, the numerical analysis is introduced to predict the dynamic characteristics of piston pump assembly components in hydraulic piston pump for aircraft. Rotating cylinder block and reciprocating pistons are modelled kinematically. Furthermore, leakage flow and torque losses between the boundary surfaces of components are analyzed. This analysis has been carried out through the commercial CASPAR program. The simulations for stress on pump assembly components using the dynamic analysis model are performed using the ANSYS 11 program. Such dynamic characteristics and stress simulation procedures will be carried out repeatedly for the optimized design.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 1997.04a
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• pp.645-649
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• 1997

In case of swash plate type axial piston hydraulic motor, hydrostatic bearing used to achieve the lubrication effect on the mechanical sliding contact areas between the following parirs ; sliooer-pad and swash plate,piston and cylinder bore,valve plate and cylinder block, etc. This study discussed the basic charateristic for the hydrostatic slipper-pad bearings with the capillary or orifice restrictor under static load condition. And, we also development of hydrostatic bearing tester for hydrostatic balancing test of pistion & slipper-pad assembly, and some experimental data on supply pressure step responce are reported.

• Proceedings of the Korea Society of Information Technology Applications Conference
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• 2002.11a
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• pp.450-458
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• 2002

본 연구에서는 신발산업을 대상으로 하여 전략적 공급사슬 프레임워크를 제안하였다. 신발산업(Footwear Industry)은 자연 여건 또는 악천후로부터 발을 보호하기 위하여 사용되는 구두, 운동화, 평상화 실내화, 슬리퍼 등을 제조하거나 판매하는 산업을 말하며, 일반적으로 신발 완제품의 제조산업과 주 구성품인 창(Sole), 갑피(Upper) 등을 제조하는 부품 제조산업으로 크게 분류된다. 신발산업은 한때 국내의 대표적인 수출상품이었으나 1990년대부터 쇠퇴기로 접어들었으며, 최근에 신발산업이 패션산업으로 부각되면서 지방자치단체의 전략산업으로 육성되고 있다. 본 연구에서는 신발산업의 체계적인 공급망 관리를 위한 기초 연구로서 전략적인 관점에서 신발산업의 공급사슬을 분석하고, 이를 바탕으로 전략적 공급사슬 프레임워크를 제안하고자 한다.

• Proceedings of the Korea Society for Industrial Systems Conference
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• 2002.11a
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• pp.450-458
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• 2002

본 연구에서는 신발산업을 대상으로 하여 전략적 공급사슬 프레임워크를 제안하였다. 신발산업(Footwear Industry)은 자연 여건 또는 악천후로부터 발을 보호하기 위하여 사용되는 구두, 운동화, 평상화 실내화, 슬리퍼 등을 제조하거나 판매하는 산업을 말하며, 일반적으로 신발 완제품의 제조산업과 주구성품인 창(Sole), 갑피(Upper) 등을 제조하는 부품 제조산업으로 크게 분류된다. 신발산업은 한때 국내의 대표적인 수출상품이었으나 1990년대부터 쇠퇴기로 접어들었으며, 최근에 신발산업이 패션산업으로 부각되면서 지방자치단체의 전략산업으로 육성되고 있다. 본 연구에서는 신발산업의 체계적인 공급망 관리를 위한 기초 연구로서 전략적인 관점에서 신발산업의 공급사슬을 분석하고, 이를 바탕으로 전략적 공급사슬 프레임워크를 제안하고자 한다.