• Journal of the Korean Society for Aeronautical & Space Sciences
• /
• v.41 no.12
• /
• pp.975-986
• /
• 2013

This paper dealt with the fabrication and performance evaluation of the electronics housing made of lightweight composite materials, aiming at the enhancement of satellite mass savings by replacing conventional aluminum alloy widely used for satellite avionics with lightweight composite material. For this purpose, a fabrication process was designed to overcome low machinability of CFRP and to minimize the post-treatment. The composite housing with grid-stiffened and monolithic frame was made using co-curing method. Its performance was also evaluated regarding endurance, stiffness, thermal conductivity, electrical grounding, EMI protection and radiation shielding. The composite housing can provide the considerable mass savings over the aluminum housing with same dimension.

• Journal of Advanced Marine Engineering and Technology
• /
• v.33 no.2
• /
• pp.288-294
• /
• 2009

The purpose of this study is manufacturing of monolithic housing for modularization of steering gear. Monolithic housing is difficult to weld with only rotation and linear motion. It is for this reason that housing of joining parts have a slope of 76.3 degrees. For this reason, welding trajectory was measured by the cooperative controled robot system, and then allowing for measured results, we developed the dedicated system. The developed system can be welded by using only 3 axises in contrast with robot system using 8 axises in housing welding. In addition, we applied CMT and laser welding device to dedicated system and as a result of experiment, sound bead and excellent roundness could be obtained.

• Proceedings of the KIPE Conference
• /
• 2012.07a
• /
• pp.1-2
• /
• 2012

도심형 전기자동차의 주요 전력변환장치인 모터구동제어기와 전장전력공급용 DC/DC 컨버터, 고전압배터리 충전기 등을 일체형으로 개발함으로써 하우징의 간소화, 방열부 및 커넥터의 불필요한 요소를 저감할 수 있어 원가절감과 연비개선 등의 효과를 얻을 수 있다. 본 논문에서는 통합형 전력변환장치 중에서 고전압배터리의 충전시간을 단축시키도록 고성능, 고효율 탑재형 충전기를 설계하고 이를 제작하여 실 충전시험으로 성능을 확인하고자 한다.

• The Journal of The Korea Institute of Intelligent Transport Systems
• /
• v.21 no.5
• /
• pp.42-56
• /
• 2022

The thesis is automated traffic control equipment system aims to improve. Areas where improvement is needed about the existing automated traffic control equipment by applying the latest technology and to improve the things that can be derived. Reflecting the derived improvements, we intend to present a plan for the design and implementation of a new unmanned traffic control device. The main improvements were designed to change the housing material of the unmanned traffic control equipment, simplify the configuration of the equipment, reduce the weight of the equipment, and change the purpose of the software. In order to evaluate the objective performance of the improved unmanned traffic control equipment through this study, it was requested to a public certification authority. The reliability of the equipment was secured through KC certification and durability test. It is intended to present the feasibility of securing the marketability of the unmanned traffic control equipment by comparing and evaluating the construction period and installation cost with the existing unmanned traffic control equipment.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
• /
• 2003.05e
• /
• pp.31-34
• /
• 2003

폴리머 애자의 장기성능예측을 위하여 많은 수단과 측정방법이 연구되어 왔다. 그러나 폴리머 애자에 있어서 성능저하는 대부분 하우징 재료의 열화에 기인되고 있어 예측 및 진단목적의 연구가 하우징 재료의 가속열화에 초점이 맞추어져 있다. 폴리머 애자는 초고압 절연성능과 기계적 강도가 우수하여 송배전 설비에 많이 사용되고 있지만 애자의 형상과 장기성능과의 관계가 정량적으로 규명되어 있지 않아 개발하는 회사는 물론 사용하는 전력회사가 함께 어려움을 가지고 있다. 폴리머 애자의 형상이 폴리머 애자의 장기 성능에 어떻게 영향을 주는 지를 비교분석하고 평가하는 연구가 필요한 시점이다. 본 연구에서는 규칙 교대 갓, 불규칙 교대 갓의 폴리머 애자를 조립방식으로 제작하고, 규칙 교대 갓의 폴리머 애자를 일체형 진공사출 방식으로 제작을 하여 건조섬락전압, 주수섬락전압, 오손섬락전압을 측정하였다. 오손섬락전압은 주수섬락에 비하여 60% 정도 감소함을 보였고 불규칙한 교대 갓의 폴리머 애자의 경우 특성의 편차가 크게 나타났다. 폴리머 애자의 경우 소재의 우수한 특성도 중요하지만 형상적인 인자도 중요한 설계요소이므로 최적화 방안이 요구된다.

• Journal of Power System Engineering
• /
• v.16 no.5
• /
• pp.26-31
• /
• 2012

A numerical study has been carried out to investigate the heat and mass transfer of an oil pumping system with a variable shape of the housing using the CFD method. Especially, the electric motor and the pump combined together, accomplishes a research about the oil supplying system. In this study, the temperature and velocity distribution of the oil pumping system by varying the flow rate of supplying oil have been investigated. The temperature changes with each five conditions(flow rate of supply oil : 2, 4, 8, 12, and 16 liter/min) have also been studied. The numerical results show that the exhaust temperature decreases as the flow rate of the supplying oil increases. It also reveals that the temperatures change differently with the housing shape.