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초고압 커먼레일 연료분사튜브 원재료 강성 최적화를 위한 인발 공정에서의 Die와 Plug 각도 변경에 따른 해석적 연구
안서연(Seoyeon Ahn),박정권(Jungkwon Park),김용겸(Yonggyeom Kim),원종필(Jongphil Won),김현수(Hyunsoo Kim),강인산(Insan Kang) 한국자동차공학회 2016 한국 자동차공학회논문집 Vol.24 No.3
The study is actively being performed to increase fuel injection pressure of common rail system among countermeasures to meet the emission regulation strengthen of the Diesel engine. The common rail fuel injection tube in such ultra high pressure common rail system has the weakest structural characteristics against vibration that is generated by fuel injection pressure and pulsation during engine operation and driving. Thus the extreme durability is required for common rail fuel injection tube, and the drawing process is being magnified as the most important technical fact for strength of seamless pipe that is the raw material of common rail tube. In this respect, we analyzed the characteristic of dimension and stress variation of the ultra high pressure common rail fuel injection tube by variation of Die and Plug angle in drawing process. Based on the analysis, we tried to obtain the raw material strength of common rail fuel injection tube for applying to the ultra high pressure common rail system. As a result, Plug angle is more important than entry angle of Die and we could obtain the target dimension and strength of the ultra high pressure common rail fuel injection tube through optimization of Plug angle.
차륜-제륜자 브레이크 시스템의 스퀼 소음 저감 인자에 관한 연구
안서연(Seoyeon Ahn),최성진(Sungjin Choi),안대권(Seongju Lee) 한국자동차공학회 2021 한국자동차공학회 부문종합 학술대회 Vol.2021 No.6
In this paper, in order to reduce the squeal noise generated by the wheel-shoe brake system of urban railway vehicles, the shape factor and the material property factor the shoe was selected and the squeal noise analysis was performed using the design of experiments. The squeal noise analysis was performed using general-purpose software based on the finite element method, and the slot shape, modulus of elasticity, coefficient of friction, and contact stiffness of the wheel were set as influencing factors, Analysis of the analysis results was performed in the high frequency range up to 11,000 Hz, and it was found that each influence factor of the brake pad has a close effect on the squeal noise, and the effect that can reduce the squeal noise was also analyzed.