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소형 차량의 Euro-5 FCC LOT(t) 특성 해석
김영웅(Youngwoong Kim),홍종열(Jongyeol Hong),용승열(Seungryoul Yong) 한국자동차공학회 2015 한국자동차공학회 부문종합 학술대회 Vol.2015 No.5
Time-resolved calculation during the cold start period FCC and BCC has been tried for the Euro 5 small vehicle equipped with 1.6 liter BCC in view of HC emission and energy. Light off time (LOt) calculation of NEDC which is slower in cold start driving was implemented. As usual tool of AU53 in this first cycle was differentiated four kinds of regions: 1) key-on and 11 sec idle, 2) short acceleration which BBC`s power is demanded and start of catalyst warm-up, 3) steady and declined speed which catalyst warmed-up, 4) re-idle which LOt of FCC is obtained. Test for temperature measurement was also handled on the two different loadings of FCC. No concrete differentiation resulted in. Calculation of FCC bed temperature can actually be headed up according to the simplified region area done previous FTP vehicle. AU53 measure applied to the Euro-5 vehicle with low speed has indicated a good correlation with measured data. Of particular importance was the suitability of current FCC specification as loading modulation is applied in calculation. Consequently by combined major variables comprising of FCC we could forecast LOt values by adjustment of major variables like A/F and RPM of vehicle, heat capacity of FCC. The result of analogous SUV vehicle resembling weight and BCC size previously implemented was employed in comparison.
김영웅(Youngwoong Kim),김종열(Jong-Yeol Kim),황영관(Young-Gwan Hwan),이민웅(Minwoong Lee),송근영(Keun-Young Song) 대한전기학회 2021 대한전기학회 학술대회 논문집 Vol.2021 No.10
본 논문에서는 기존 광섬유 방사선량계 기술의 문제점이었던 방사선 외 다양한 내·외적 요인에 의한 광신호의 광량 변화에 따른 센서 계측 신호의 왜곡 문제를 해결하기 위한 목적으로 FBG pair 기반의 방사선 유도 광손실 측정 기법 및 구성도를 제시하였다. 본 기법을 통해 광섬유 방사선량계 구성에서 신호전송부 광손실과 센서부 광손실 구분이 가능하며, 방사선량 측정 신뢰도를 향상시킬 수 있음을 보였다.
이류체 세정공정에서 이물질 포집 장치 개발에 관한 수치적 연구
김영웅(Young Woong Kim),신규식(Gyu Sik Shin),조기영(Ki Yeong Jo),양시영(Si Young Yang),김형민(Hyung Min Kim) 대한기계학회 2022 대한기계학회 춘추학술대회 Vol.2022 No.11
The purpose of the research is to develop a device to prevent secondary contamination by particles removed in the cleaning process of small precision plastic lens injection molds. The particle capturing device consists of two-fluid jet injection inlet for cleaning and another inlet of atmospheric air to maintaining the cleaning effect and an outlet for inhale the particles by applying vacuum pressure. The optimal air intake size was 0.12L and the outer shape of the device was proposed to have an inclination of 45°. In addition, a baffle was installed between the injection and the suction port inside the device to maximize the cleaning and capturing effect. The optimal length of the baffle was evaluated by analyzing the flow and particle behavior. The length of the cylindrical shape of the baffle with a constant cross section is suitable for 1.8L, 2.4L, and 3L, and the optimal length for the conical shape of the baffle was evaluated to be 3L.