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가속수명시험을 통한 수출형 K2전차 전장품 신뢰성 평가
문성목,김영강,최보욱,최훈기 국방기술품질원 2023 국방품질연구논집 Vol.5 No.1
In this study, an acceleration life test was conducted to evaluate the reliability of major electronic equipment to meet the operational environment and operational concepts of the Middle East with the goal of improving the reliability of electronic equipment to be installed in an export-type K2 tank. The results of the acceleration life test were used to identify potential failure risk factors in the electronic equipment design stage, and to predict whether the target life with a cumulative failure probability of 5% for 10 years could be met. In this study, the target life was determined by allocating the design mean time between failure (MTBF) and K-LOG MTBF the same weight of 50% each, and the acceleration life test method for temperature/humidity stress was designed and the acceleration life test was conducted. In addition, the calculation formula for the acceleration life test time under acceleration life test conditions was verified using MINITAB Software. Under the acceleration life test conditions, the test was completed without failure until the acceleration life test time, and it was found that the target life with a cumulative failure rate of 5% for 10 years was met. In the future, the acceleration life test will be conducted until an actual failure occurs, and life data for the test object and the cause of the failure will be supplemented.
추진기관 시험설비 화염유도로 냉각시스템에 관한 수치적 연구
문성목(Seong-Mok Moon),이경훈(Kyoung-Hoon Lee),강호신(Ho-Sin Kang),김동환(Dong-Hwan Kim),조남경(Nam-Kyung Cho),한영민(Yeoung-Min Han) 한국추진공학회 2013 한국추진공학회 학술대회논문집 Vol.2013 No.12
본 연구에서는 추진기관 시험설비 화염유도로 기본 설계안에 대한 3차원 화염냉각 해석을 수행함으로써 화염유도로 설계안에 대한 열적 안전성 및 연소가스의 원활한 배출에 대하여 평가하였다. 화염과 냉각수 간의 열전달 및 상변화 과정을 모사하기 위하여 Mixture 다상유동모델을 이용하였으며, 비반응단일 화학종 플룸모델을 적용하여 화염냉각 해석을 수행하였다. 본 해석결과를 통하여 화염유도로 벽면에서의 최고온도와 최대압력을 도출하였으며, 또한 노즐출구에서 분사된 연소가스가 화염유도로에 의해 외부로 원활히 배출되고 있음을 확인하였다. In this study, a thermal safety and a smooth discharge of the exhaust gas for the flame deflector design are assessed by a 3-D flame cooling analysis for the flame deflector of the propulsion test facility. The mixture multiphase model is applied for the simulation of heat transfer and phase exchange process between a flame and a cooling water, and a numerical analysis using the unreacted single species model for the exhaust plume is conducted for the flame cooling. The numerical analysis for the flame cooling predicts maximum temperature and pressure on the flame deflector wall, and shows the smooth discharge toward exterior of the exhaust gas from the nozzle exit.
Eulerian 다상유동기법을 이용한 300톤급 추진기관 시험설비 화염유도로 냉각해석
문성목(Seong-Mok Moon),조남경(Nam-Kyung Cho),김성룡(Seong-Lyong Kim),전성복(Sung-Bok Jun),이경훈(Kyoung-Hoon Lee),신재렬(Jae-Ryul Shin) 한국추진공학회 2014 한국추진공학회 학술대회논문집 Vol.2014 No.12
본 연구에서는 300톤급 추진기관 시험설비 화염유도로 기본 설계안에 대한 열적 안전성 및 연소가스의 안전한 배출을 검토하기 위하여 3차원 화염냉각 해석을 수행하였다. 화염과 냉각수 간의 열전달 및 상변화 과정을 모사하기 위하여 Mixture 다상유동모델을 이용하였으며, 단일 화학종 비반응 플룸모델을 적용하여 화염냉각 해석을 수행하였다. 본 해석결과를 통하여 화염유도로 벽면에서의 최고 온도값을 도출하였으며, 또한 연소가스가 화염유도로에 의해 외부로 안전하게 배출되고 있음을 확인하였다. In this study, a 3-D flame cooling analysis is conducted to examine a thermal safety for the flame deflector of the 300tf class propulsion test facility, and a safe discharge of the exhaust gas is assessed by using the numerical results. The Mixture multiphase model is applied for the simulation of heat transfer and phase exchange process between flame and cooling water, and a numerical analysis using the single species unreacted model for the exhaust plume is carried out for the flame cooling. The numerical analysis for the flame cooling predicts maximum temperature on the flame deflector wall, and shows the safe discharge toward exterior of the exhaust gas.
고속열차 교행시 차량 실내 · 외 압력변동에 관한 수치적 연구
문성목(Seongmok Moon),이경훈(Kyounghoon Lee) 한국자동차공학회 2019 한국자동차공학회 학술대회 및 전시회 Vol.2019 No.11
A three-dimensional unsteady computational study is performed to assess the inside and outside pressure variation of two high-speed trains passing by each other, and to estimate the aural discomfort of the passenger through comparisons between the computed results and the safety criterion of domestic trains. The dynamic mesh technique and the smooth starting approach are adopted to simulate the transient vehicle movement. During passing by each other in the tunnel, complex pressure wave interactions within the tunnel occur due to the pressure waves by the opposite train. It leads to the rapid pressure variation on the internal and external surface of vehicle, and finally results in the aural discomfort of the passengers. Computed results show that the internal maximum pressure variations during passing by each other in the tunnel meet the safety criterion of vehicle. In addition, the internal maximum pressure variation when two trains pass by each other in the tunnel increase 1.5 to 2 times more than that when one train travels in the tunnel.
문성목(Seong-Mok Moon),김종암(Chongam Kim),노오현(Oh-Hyun Rho),홍승규(Seung Kyu Hong) 한국항공우주학회 2004 韓國航空宇宙學會誌 Vol.32 No.8
경사충격파와 와류간의 상호작용에 관한 수치적 해석은 경사충격파에 기인한 와류붕괴의 발생에 관한 이론적 모델 및 실험치와 비교하기 위해 수행되었다. 본 연구의 해석을 위해 마하수에 기초한 Roe의 기법 (RoeM)과 2-방정식 난류 모델을 이용하여 3차원 난류 유동장을 효과적으로 계산하였다. 자유류 마하수 2.49에서 와류세기, 축방향속도 성분, 충격파 세 기의 변화에 따른 상호작용의 영향을 연구하였다. 2 방정식 난류모델인 k- ωSST 난류모델과 적절히 모델링된 와류모델을 이용하여 수치연구를 수행함으로써 실험적으로 관찰된 여러 유동장을 정확히 모사할 수 있었다. 경사충격파에 기인한 와류붕괴의 발생에 관한 기준을 결정하기 위한 본 연구결과는 이론적 모델과 실험치와 일치된 결과를 보여주고 있음을 확인하였다. For the prediction on the onset of oblique shock wave-induced vortex breakdown, computational studies on the Oblique Shock wave/Vortex Interaction (OSVI) are conducted and compared with both experimental results and analytic model. A Shock-stable numerical scheme, the Roe scheme with Mach number-based function (RoeM), and a two-equation eddy viscosity-transport approach are used for three-dimensional turbulent flow computations. The computational configuration is identical to available experiment, and we attempt to ascertain the effect of parameters such as a vortex strength, stream wise velocity deficit, and shock strength at a freestream Mach number of 2.49. Numerical simulations using the k- ωSST turbulence model and suitably modeled vortex profiles are able to accurately reproduce many fine features through a direct comparison with experimental observations. The present computational approach to determine the criterion on the onset of oblique shock wave-induced vortex breakdown is found to be in good agreement with both the experimental result and the analytic prediction.