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큰 외경 튜브집합체를 위한 삽입형 지지체의 충격강도해석
김재용(JeaYong Kim),윤경호(KyungHo Yoon),이영호(YoungHo Lee),이강희(KangHee Lee),김형규(HyungKyu Kim) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.5
Insertion type spacer grid structure for dual cooled nuclear fuel is developed to support a dual cooled fuel and to keep guide tubes straight. To evaluate the impact characteristics such as critical impact velocity, buckling strength and duration time, single impact analysis has been performed to simulate pendulum type impact test. Initial impact velocity is increased from 561 ㎜/s until the spacer grid support is buckled. 12 by 12 size spacer grid and Zircaloy-4 material are used for impact analysis. Explicit analysis is conducted by using commercial finite element analysis program, ABAQUS. The local buckling point is decided when the slope for increment of impact force is sharply descending after ascending in impact force curve via velocity. Through this analysis the dynamic failure behavior of insertion type spacer grid is predicted.
간극 열전도도를 적용한 핵연료봉 열응력해석 방법론 개발
김재용(JeaYong Kim),양용식(YongSik Yang),강흥석(HeungSeok Kang),윤경호(KyungHo Yoon),이영호(YoungHo Lee),이강희(KangHee Lee),김형규(HyungKyu Kim) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.11
A nuclear fuel rod is composed of pellets, a cladding tube, two end plugs, a plenum spring and helium gas. During a nuclear fission, the temperature of pellets is increased sharply. Then heat transfer from the center of pellets to outer surface of cladding tube happens. But there is temperature jump phenomenon due to the gap between pellets and a cladding tube. In this paper, to simulate this phenomenon the methodology using a user subroutine function of ABAQUS is suggested for thermal stress analysis for a nuclear fuel rod. Suggested method is verified through thermal stress analysis for a simple model and then newly established methodology is used for a real nuclear fuel rod shape.
실시간 CG렌더링 소프트웨어를 활용한 3D 애니메이션 제작 사례 분석 연구 - 루미온을 활용한 제작 사례를 중심으로
권종산(Chongsan Kwon),김재용(Jeayong Kim) 한국콘텐츠학회 2023 한국콘텐츠학회논문지 Vol.23 No.12
There have been many studies to improve the efficiency of the 3D animation production process by utilizing game engines. However, the fact that it is not easy to learn the game engine is acting as a limiting factor, and real-time CG rendering software that is simple to use and has fast rendering speed has recently received a lot of attention as an alternative. In this study, 3D animation was produced using real-time CG rendering software, and the case was analyzed. To this end, various real-time CG rendering software was compared and analyzed, and 3D animation was produced using Lumion among them. model ling, rigging, and character animation were done in 3DS Max and mapping, layout, and final rendering were done in Lumion. And, the differences between the traditional production process that completes the final rendering in 3DS Max and the production process using Lumion were compared and analyzed in quantitative and qualitative ways. As a result of the analysis, unlike the production process that completes the final rendering work with 3D software, the production process using Lumion was able to shorten the work time by proceeding with the work through the viewport screen that shows the final result in real-time, and it was confirmed that work efficiency was improved by deriving the final result through real-time rendering. Recently, various attempts have been made to improve work efficiency in the 3D animation production practice, and it is expected that work efficiency will be improved if real-time CG rendering software such as Lumion is used.