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장인규(Ingyu Jang),이정우(JeongWoo Lee),백인하(Inah Paick),박승범(SeungBum Park) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
최근 친환경차량 개발이 가속화되고 있으며, 당사에서도 이에 부응하여 관련 자동차 제어시스템 연구를 활발히 연구하고 있다. 본 연구에서는 저속 전기차량 시스템 개발(Neighborhood EV)을 위한 구동제어로직 개발수행에 대한 내용이며, In wheel 모터를 활용하여 구동 및 주행성능을 높이고자 한다. 에너지 변환효율을 높은 모터를 이용하여 운전자 의도 및 주행상황에 맞추어 최적으로 제어하기 위한 제어알고리즘을 개발하였으며, 차량동역학 시뮬레이션을 통해 기본성능 및 타당성을 확인하였다. 앞으로 여러가지 주행 조건별 실차시험을 통해 성능 검증을 수행할 예정이다
사각형 딤플로 Surface Texturing한 경사진 Slider 베어링의 윤활해석
박태조,장인규,Park, TaeJo,Jang, InGyu 한국트라이볼로지학회 2022 한국트라이볼로지학회지 (Tribol. Lubr.) Vol.38 No.5
With the world's fast expanding energy usage comes a slew of new issues. Because one-third of energy is lost in overcoming friction, tremendous effort is being directed into minimizing friction. Surface texturing is the latest surface treatment technology that uses grooves and dimples on the friction surface of the machine to significantly reduce friction and improve wear resistance. Despite the fact that many studies on this issue have been conducted, most of them focused on parallel surfaces, with relatively few cases of converging films, as in most sliding bearings. This study investigated the lubrication performance of surface-textured inclined slider bearings. We analyzed the continuity and Navier-Stokes equations using a commercial computational fluid dynamics code, FLUENT. The results show the pressure and velocity distributions and the lubrication performance according to the number and orientation of rectangular dimples. Partial texturing somewhat improves the lubrication performance of inclined slider bearings. The number of dimples with the maximum load-carrying capacity (LCC) and minimum friction is determined. When the major axis of the dimple is arranged in the sliding direction, the LCC and friction reduction are maximized. However, full texturing significantly reduces the LCC of the slider bearing and increases the flow rate. The results have the potential to improve the lubrication performance of various sliding bearings, but further research is required.
미세 그루브가 있는 무한폭 Slider 베어링의 윤활해석: 제1보 - 그루브 위치의 영향
박태조(TaeJo Park),장인규(InGyu Jang) 한국트라이볼로지학회 2019 한국트라이볼로지학회지 (Tribol. Lubr.) Vol.35 No.6
Surface texturing is widely applied to reduce friction and improve the reliability of machine elements. Despite extensive theoretical studies to date, most research has been limited to parallel thrust bearings, mechanical face seals, piston rings, etc. However, most sliding bearings have a convergent film shape in the sliding direction and the hydrodynamic pressure is mainly generated by the wedge action. The results of surface texturing on inclined slider bearings are largely insufficient. This paper is the first part of a recent study focusing on the effect of the groove position on the lubrication performances of inclined slider bearings. We model a slider bearing with one rectangular groove on a fixed pad and analyze the continuity and Navier–Stokes equations using a commercial computational fluid dynamics (CFD) code, FLUENT. The results show that the film convergence ratio and the groove position have a significant influence on the pressure and velocity distributions. There are groove positions to maximize the supporting load with the film convergence ratio and the groove reduces the frictional force acting on the slider. Therefore, the proper groove position not only improves the load-carrying capacity of the slider bearings but also reduces its frictional loss. The present results apply to various surface-textured sliding bearings and can lead to further studies.
안희락(Heerak Ahn),장인규(Ingyu Jang),박규식(Kyushik Park) 한국자동차공학회 2014 한국자동차공학회 학술대회 및 전시회 Vol.2014 No.11
Environmental concerns, fuel efficiency regulation as emission standards make driving with alternative fuel Vehicle harder and harder, and they bring a big competition in the Hybrid Electrical Vehicles (HEVs) market. Currently, 48 V Belt driven Starter Generator (BSG) system attracts the notice of the HEVs market with its improvement of fuel efficiency for cost and minimization of system change.1) To maximize the efficiency of the HEV system, the battery system has great meaning on the efficiency of the HEV system, since it comprises a large proportion of cost and weight of the system. Therefore designing efficient battery system can be directly considered as enhanced system efficiency. This research aims to compose battery systems of the BSG system for each vehicle segment, including capacity, power, energy, volume, price and rough lifetime.