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우주발사체 액체로켓의 추진기관용 고강도 3-Way 파이로밸브 파단 특성
강대희,이효원,정윤재,김원태 한국기계기술학회 2022 한국기계기술학회지 Vol.24 No.4
In this paper, based on the existing research, we define the parameters for the number of ignition devices to be applied to the pyrovalve, the operation and airtightness according to the temperature, the material of the nipple and the thickness of the fractured part, and ANSYS Ver. 19.2 was used to analyze the FEA model, and a comparative analysis was conducted through structure analysis according to the piston shape of the pyrovalve. In addition, an experimental study was conducted by manufacturing a prototype according to the design variables. As a result, high-strength pyrovalves can stably supply working fluids such as fuel and oxidizer for space launch vehicle propulsion engines, as well as precisely control flow path switching was confirmed.
전산 해석을 활용한 형상에 따른 가스발생기점화기 럽처디스크의 파단 분석
강대희,이승주,정윤재,김원태 한국기계기술학회 2020 한국기계기술학회지 Vol.22 No.6
In turbopump type liquid rocket engines, ignition and starting are known to be the most unstable and risky section among all operating sections of the projectile. The operation of the liquid rocket engine is the process of ignition and combustion of the main combustor after the turbo pump is driven into a stable section due to the turbine driving of the turbo pump and the ignition and combustion of the gas generator by the pyro starter. In this process, the driving of related components directly influences each other, so each component must be operated with sufficient reliability. In particular, if the igniter does not supply sufficient ignition energy at a predetermined time, an explosion may occur due to stagnation of the fuel/oxidant mixture, so reliability is more important. In this study, the fracture analysis of the gas generator igniter rupture disk according to the shape was performed using computational analysis. As a result, comparative analysis was performed to obtain the optimal dimensions according to each variable condition.
강대희 가톨릭대학교 산업의학센터 2000 韓國의 産業醫學 Vol.39 No.4
The differences in disease occurrence varies from country to country. These might be either due to difference in genetic constituency in individuals from different ethnic backgrounds or to environmental factors including diet and personal habits, or more plausibly to the interactive effects of genetic and environmental factors. Post-gencomic era opens the potential application of functional genomics to the fields of occupational health. This mini-review of $quot;genetic effects in occupational diseases$quot; deals with several newly challenging areas of application of genetic information in occupational health Recent reports regarding the genetic susceptibility to occupational asthma, particularly DRB1 or DQB1 HLA class polymorphism give us interesting insights that the genetic information may play an important role in development of occupational asthma and this can be a good example of how genetic information provide us to better understanding for etiology of occupational diseases. Genetic testing for the employees who apply new jobs or genetic monitoring for the employees in certain hazardous environments also stimulate important issues of ethical, social, and economical problems among employees enforced to take the genetic testing. Finally, how genetic information can be used in delineating work-relatedness in compensating cases for occupational diseases was reviewed.
오픈형 충전 해압 및 밸브의 유체 거동 분석을 위한 전산 수치해석
강대희,이효원,이승주,김원태 한국기계기술학회 2022 한국기계기술학회지 Vol.24 No.2
Valves are one of the indispensable components in modern industry. Filling and de-pressure connectors in rocket valves used for space launch vehicles are very important parts for smooth fluid supply. For this reason, an optimized design that can improve efficiency, miniaturization, weight reduction, and safety of the valve at the same time is required. In this work, flow analysis and structural analysis were performed through 3D modeling using computational numerical analysis for open type filling and de-pressure valves. As results, the flow velocity and pressure distribution of the fluid were analyzed through the flow analysis of valve, and stress distribution was conducted in structural analysis. Through this study, it is consequently expected to provide valves of various specifications by performing production and performance test evaluation of development prototypes.