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권기찬,박상훈,윤성기,Kwon, Kie-Chan,Park, Sang-Hoon,Youn, Sung-Kie 대한기계학회 2002 大韓機械學會論文集A Vol.26 No.11
The first-order least-squares meshfree method for linear elasticity is presented. The conventional and the compatibility-imposed least-squares formulations are studied on the convergence behavior of the solution and the robustness to integration error. Since the least-squares formulation is a type of mixed formulation and induces positive-definite system matrix, by using shape functions of same order for both primal and dual variables, higher rate of convergence is obtained for dual variables than Galerkin formulation. Numerical examples also show that the presented formulations do not exhibit any volumetric locking for the incompressible materials.
사용후핵연료 처리를 위한 ACP 실증시설내 개폐형 작업대의 구조적 안전성 평가
권기찬,구정회,이은표,정원명,유길성,이원경,조일제,국동학,Kwon, Kie-Chan,Ku, Jeong-Hoe,Lee, Eun-Pyo,Choung, Won-Myung,You, Gil-Sung,Lee, Won-Kyung,Cho, Il-Je,Kuk, Dong-Hak 한국방사성폐기물학회 2006 방사성폐기물학회지 Vol.4 No.1
A demonstration facility for advanced spent fuel conditioning process (ACP) is under construction in KAERI. In this hot cell facility, all process equipments and materials are taken in and out only through the rear door. The working table in front of the process rear door is specially designed to be openable for the efficient use of the space. This paper presents the structural safety analysis of the openable working table, for the normal operational load condition and accidential drop condition of heavy object. Both cases are investigated through static and dynamic finite element analyses. The analysis results show that structural safety of the working table is sufficiently assured and the working table is not collapsed even when an object of 500 kg is dropped from the height of 50 cm.
권기찬,윤성기,Gwon, Kie-Chan,Youn, Sung-Kie 대한기계학회 1997 大韓機械學會論文集A Vol.21 No.12
A parallel approach using a network of engineering workstations is presented for the efficient computation in the elastoplastic analysis of strip rolling process. The domain decomposition method coupled with the frontal solver for elimination of internal degrees of freedom in each subdomain is used. PVM is used for message passing and synchronization between processors. A 2-D plane strain problem and the strip rolling process are analyzed to demonstrate the performance of the algorithm and factors that have a great effect on efficiency are discussed. In spite of much communication time on the network the result illustrates the advantages of this parallel algorithm over its corresponding sequential algorithm.
사용후핵연료 차세대관리 종합공정 실증시설내 후면 차폐문의 구조적 안전성 평가
권기찬,구정회,이은표,정원명,유길성,이원경,국동학,조일제,Kwon, Kie-Chan,Ku, Jeong-Hoe,Lee, Eun-Pyo,Choung, Won-Myung,You, Gil-Sung,Lee, Won-Kyung,Kuk, Dong-Hak,Cho, Il-Je 한국방사성폐기물학회 2006 방사성폐기물학회지 Vol.4 No.1
A demonstration facility for an advanced spent fuel conditioning process (ACP) is under construction at KAERI. In this hotcell facility, the rear door is frequently used since all process equipment and materials are taken in and out only through the rear door. Therefore , both the structural safety and stability of the door are essentially required for the safety of ACP facility. In this paper, the finite element analysis has been performed to investigate the structural safety under the impact condition between the rear door and the door frame. Also the possibility of the rear door being tumbled over by the impact force or the inertia force under a sudden stop conditon has been evaluated. The analysis results demonstrate that the structural safety and stability of the rear door are sufficiently assured for both the impact and the accidential stop conditions.
병렬 컴퓨터를 이용한 형상 압연공정 유한요소 해석의 분산병렬처리에 관한 연구
권기찬,윤성기,Gwon, Gi-Chan,Yun, Seong-Gi 대한기계학회 2000 大韓機械學會論文集A Vol.24 No.5
Parallel Approaches using Cray T3E which is NIPP (Massively Parallel Processors) machine are presented for the efficient computation of the finite element analysis of 3-D shape rolling processes. D omain decomposition method coupled with parallel linear equation solver is used. Domain decomposition is applied for obtaining element tangent stifffiess matrices and residual vectors. Direct and iterative parallel algorithms are used for solving the linear equations. Direct algorithm is_parallel version of direct banded matrix solver. For iterative algorithms, the well-known preconditioned conjugate gradient solver with Jacobi preconditioner is also employed. Moreover a new effective iterative scheme with block inverse matrix preconditioner, which is named by present authors, is presented and its results are compared with the one using Jacobi preconditioner. PVM and MPI are used for message passing and synchronization between processors. The performance and efficiency of each algorithm is discussed and comparisons are made among different algorithms.