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연속 접촉 헬리컬 기어펌프의 수치해석 연구: 모델 개발 및 적용
장호성(H. S. Jang),박민규(M. G. Park),성준영(J. Y. Seong),양경욱(K. U. Yang),최세령(S. R. Choi),지상원(S. W. Ji) 유공압건설기계학회 2022 유공압건설기계학회 학술대회논문집 Vol.2022 No.06
External gear pump(EGP) has a simple structure and excellent durability among hydraulic pumps, so they are generally used in hydraulic control system and fuel transfer system. However, in an involute tooth type pump, a volume trapped between the gear teeth is formed during two-point contact, and as a result pressure pulsation, vibration, and noise are generated, thereby deteriorating volumetric efficiency. To compensate for these shortcomings, a continuous contact helical gear pump(CCHGP) has been proposed and has been commercialized recently. Advantages have proven to be of great benefit in terms of reduced flow and pressure pulsations, as well as noise reduction due to the absence of entrapped volumes. However, unbalanced thrust occurs and manufacturing is difficult, so related research is insufficient. In this paper, continuous contact gear teeth were designed, and flow analysis was performed using a commercial program (SimericsMP+) to shape continuous contact helical gear teeth. We present a numerical approach to predict flow and pressure pulsations and pump performance by applying cavitation and turbulence.
자동차용 LED headlamp 방열시스템 최적화를 위한 실험적 연구
장호성(H.S.JANG),이재명(J.M.LEE),황창국(C.K.HWANG),사공극(K.SA-KONG) 대한기계학회 2013 대한기계학회 춘추학술대회 Vol.2013 No.12
LED has started to be used widely in various fields recently because of the many advantages it has; such as long lifetime, low power consumption, mercury-free and high design freedom. LED is getting a lot of use in the auto industry also requiring the implementation of a wide variety of designs. However, the number of LED increases according to the complexity and diversity of headlamp design. Since LEDs produce a lot of heat the more LEDs the more heat creating an important design problem in the heat management from LEDs. Natural or Forced convection cooling system can be used to manage thermal management depending on headlamp design. This study is about the