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고속열차에 의한 터널내 압력파 전파의 3차원 형상을 고려한 CFD 해석
신대용(D.Y. Shin),이상건(S.G. Lee),오현주(H.J. Oh),김홍근(H.G. Kim),남성원(S.W. Nam),김찬중(C.J. Kim) 한국전산유체공학회 2011 한국전산유체공학회 학술대회논문집 Vol.2011 No.11
This research is about proposing the design of a tunnel with a vertical vent to secure passengers in a comfortable environment and safe against pressure. Using the 3-dimensional CFD, the magnitude of the pressure induced by the vertical vent in the tunnel can be analyzed. In addition to the 3-dimensional method, the 2-dimensional method and the 2-dimensional axis-symmetric method are also used to analyze the strong and weak points of each so that the optimum design can be obtained. As a result, it appears that the 2-dimensional axis-symmetric method is most suitable in analyzing tunnel pressure. Also, the 3-dimensional method is disadvantageous in that it takes longer in calculating results, but is more effective in predicting phenomena around the vertical vent in the tunnel.
원자력방출밸브의 작동성 검증을 위한 수학적 모델에 대한 연구
신대용(D.Y. Shin),김재형(J.H. Kim),신동우(D.W. Shin),이정희(J.H. Lee),김찬중(C.J Kim) 한국전산유체공학회 2012 한국전산유체공학회 학술대회논문집 Vol.2012 No.5
As for the pressure relief valve used in the nuclear power plant, its performance has to be evaluated by KEPIC MF and its capacity test has to be executed by KEPIC MOZ. In case the experiment equipment is limited, the emission flow of the real model is estimated with the results of emission flow coming from its small-scale model. However, parameters such as the change of lift and thrust are difficult to estimate in the small-scale model, and its numerical model is needed. This study is intended to make up a numerical model so that it can analyze the emission flow and operation change in a method similar to the system of power-driven valve and check valve in the pressure relief device. One-dimensional system analysis is mainly performed until now, but this study has achieved a numerical model with a high degree of precision by using computer flow simulation and by performing precise multi-dimensional flow analysis as well as kinetics analysis.
3차원 형상을 고려한 고속철도에 의한 터널내 압력파 전파의 CFD 해석
신대용(D.Y. Shin),이상건(S.G. Lee),오현주(H.J. Oh),김홍근(H.G. Kim),윤수환(S.H. Yoon),김찬중(C.J. Kim) 한국전산유체공학회 2012 한국전산유체공학회지 Vol.17 No.4
Research has importance in proposing the design of a tunnel with a vertical vent to secure passengers in a comfortable environment and safe against pressure. Using several analysis methods, the magnitude of the pressure induced by the vertical vent in the tunnel can be analyzed. In addition to the 3-dimensional method, the 2-dimensional method and the 2-dimensional axis-symmetric method are also used to analyze the strong and weak points of each so that the optimum analysis method can be obtained. As a result, it appears that the 2-dimensional axis-symmetric method is the most suitable in analyzing tunnel pressure consider to accuracy and time effective aspect. Also, the 3-dimensional method is disadvantageous in that it takes longer in calculating results, but is more effective in predicting phenomena around the vertical vent in the tunnel.
고소 작업용 섬유로프의 고정 매듭법에 따른 강도 변화의 해석 및 실험적 연구
송상민,김민섭,신대용,임사혁,권오헌,박우림,Song, S.M.,Kim, M.S.,Shin, D.Y.,Lim, S.H.,Kwon, O.H.,Park, W.R. 한국안전학회 2022 한국안전학회지 Vol.37 No.3
Workplace accidents are common while working at elevations. Thus, various safety measures such as safety handrails and horizontal safety nets are implemented to prevent falls. The minimum safety measure is the lifeline installation. However, because its standards have not been clearly established, it is often misused, resulting in inappropriate knot methods that increase the chance of accidents while working at elevations. Therefore, clarifying the appropriate usage methods or criteria for the various lifelines is required in the field. This study proposed an appropriate installation method by experimentally and numerically evaluating the change in strength according to the fixed knot lifeline method. In addition, three knot methods were specified for each material. The results obtained are expected to contribute to lessening falls through the establishment of lifeline installation standards and the development of appropriate parts.
김재형(J.H. Kim),신대용(D.Y. Shin),신동우(D.W. Shin),이정희(J.H. Lee),김찬중(C.J Kim) 한국전산유체공학회 2012 한국전산유체공학회 학술대회논문집 Vol.2012 No.5
In case that there is no large test facility for the operation test of pressure relief valve in nuclear power plant, there is no experimental method to get the operation parameter such as the change of lift and thrust, the dead time, the stroke time, and flow capacity. In this study, the analysis of operation parameter was performed with the mathematical model. The mathematical model was made by combine computational fluid dynamics and multi-body dynamic, which leads to accurate mathematical model. This analysis result can be used in the functional qualification of pressure relief valve in nuclear power plant.