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방재원,정인수,김경남,정경섭 충북대학교 건설기술연구소 2004 建設技術論文集 Vol.23 No.1
In this study the structural behavior of the curved steel box girder bridge by cross beam spacing is investigated. Suitable form of curved bridge is steel box girder that is good twist and bending stiffness but it include non-economical member as rationalization. For this purpose a two-girder and three-span continuous steel box bridge which is under construction is analyzed. This study is analysis by the medium factor of a space of cross beam and dead load, live load(DB24), slab placement order. The result of the structural analysis shows that becomes the cross beam more than 6m and cross beam number more than 3 are quite well-designed in comparison with the present design.
전산해석 및 풍동시험을 이용한 유도형 활공탄약의 공력해석
방재원,Bang, Jae Won 한국시뮬레이션학회 2019 한국시뮬레이션학회 논문지 Vol.28 No.1
전산해석과 풍동시험을 이용하여 유도형 활공탄약의 공력특성을 연구하였다. 전산해석으로는 반실험적 기법인 Missile DATCOM과 전산유체역학 해석프로그램인 FLUENT를 사용하였다. 유도형 활공탄약에 대해 양력 및 항력, 피칭모멘트 등을 계산하여 기본적인 공력특성을 확인하였으며 기존의 탄약과는 전혀 다른 공력특성을 갖는 것을 확인했다. 전산해석을 통해 얻은 결과는 풍동시험을 통해 얻은 결과와 대체적으로 유사했다. 반실험적 기법으로 얻은 결과 중 피칭모멘트 값은 풍동시험결과와 약간 차이가 났지만, 전체적으로 전산해석의 결과는 시험결과와 유사한 경향과 값을 나타냈다. 본 연구를 통해 유도형 활공탄약의 공력특성을 확인하였으며, 유도형 활공탄약 초기설계 시 공력특성 분석을 위해 반실험적기법 및 전산유체역학적 해석 기법을 적용할 수 있음을 확인하였다. In this study aerodynamic characteristics of guided gliding type ammunition were investigated by using a computational analysis and wind tunnel test. Missile DATCOM, a semi-empirical method, and a FLUENT, a computational fluid dynamics analysis program, were used for computational analysis. For a guided gliding type ammunition, aerodynamic characteristics were investigated by calculating lift force, drag force, pitching moment and etc. Aerodynamic characteristics of guided gliding type ammunition are completely different from those of conventional ammunition. The results obtained from the computer analysis are similar to those obtained from the wind tunnel test. Although the pitch moment values obtained by the semi-empirical method were slightly different from the wind tunnel test results, the overall computer analysis results showed trends and values similar to the test results. In this study, aerodynamic characteristics of guided gliding type ammunition were identified and it found that semi-empirical method can be applied to analyze the aerodynamic characteristic in the initial design of guided gliding ammunition.
포탄의 꼬리날개가 기저항력에 미치는 영향에 대한 해석적 연구
노성현,김종록,방재원 한국군사과학기술학회 2019 한국군사과학기술학회지 Vol.22 No.5
Recently, research on projectiles with wings for precision guidance is actively underway. In this study, weanalyzed how the tail fins attached to the projectile affect the base drag. Aerodynamic analysis was performedwith RANS(Reynolds Averaged Navier-Stokes) equations using FLUENT, a commercial CFD(Computational FluidDynamics) code. Through the aerodynamic analysis, the base drag characteristics of the projectile by parameters(number, length, thickness, position, shape of tail fin) were investigated. The results of this study are expected tobe applicable to aerodynamic design of tail fins mounted on projectiles.