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[가솔린엔진부문] 초음파 에너지를 이용한 가솔린 분사의 2차원 질량분포특성
윤면근(Myeonkeun Yoon),김용국(Youngkuk Kim),김진구(Jinku Kim),류정인(Jeongin Ryu) 한국자동차공학회 1999 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1999 No.11_1
To investigate the effect of ultrasonic energy on the spray characteristics of gasoline injection, we researched 2-D spray mass-distribution of gasoline sprayed by gasoline injector, controlled by electronic circuit, and compared in case of gasoline added ultrasonic energy with in case of not.<br/> The mass-distribution characteristics of gasoline spray was measured by 2-D patternator equivalent spray cone angle was calculated with the data.<br/> The major three parameters are the ultrasonic energy, added on gasoline or not, injection pressure, 2bar~6bar by 1bar, the sampling distance from nozzle tip, 60~120mm by 20mm.<br/> The results show that the equivalent spray cone angle was larger gradually by adding ultrasonic energy, lowering injection pressure and sampling distance.<br/> With this results, the data-base on the spray characteristics of gasoline injector would be compiled and utilized for betterment of gasoline injector.
예측방법론 기반 연속형 계획 모델을 적용한 무기체계의 신뢰도 성장 계획
서양우(Yangwoo Seo),박은심(Eunshim Park),김용국(Youngkuk Kim),이관영(Kwanyoung Lee),김명수(Myungsoo Kim) 한국신뢰성학회 2018 신뢰성응용연구 Vol.18 No.3
Purpose: To develop the reliability growth planning for a subsystem of guided weapon system using PM2-Continuous model. Methods: The target MTBF of the subsystem is set by allocating the system target MTBF to the lower level, where ARINC method is applied. Other model parameters such as initial MTBF, management strategy ratio and average fix effectiveness factor are chosen from historical growth parameter estimates. Given the values of model parameters, the reliability growth planning curve using PM2-Continuous model is constructed and the sensitivity analyses are performed for the changes of model parameters. Results: We have developed the reliability growth plan for a subsystem of guided weapon system using PM2-Continuous model. It was found that the smaller the ratio of initial MTBF to target MTBF, the smaller the management strategy ratio, the smaller the average fix effectiveness factor, and the shorter the development test period, the higher reliability growth is required. Conclusion: The result of this study will be used as a basis for establishing the reliability growth plan, the test period setting and the budget appropriation for the similar system entering the system development stage in the future.