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IT 모듈의 자유 낙하 모사를 위한 병렬처리시스템의 적용
박영재(Y. J. Park),이준성(J. S. Lee),고한옥(H. O. Ko),장윤석(Y. S. Chang),최재붕(J. B. Choi),김영진(Y. J. Kim) 한국정밀공학회 2006 한국정밀공학회 학술발표대회 논문집 Vol.2006 No.5월
Recently, the flat display modules such as plasma or TFT-LCD employ thin crystallized panels which are normally weak to high level transient mechanical energy inputs. As a result, anti-shock performance is one of the most important design specifications for TFT-LCD modules. However, most of large display module designs are generated based on engineers own experiences. Also, a large-scale analysis to evaluate complex material and structural behaviors is one of interesting topic in diverse engineering and scientific fields. The utilization of massively parallel processors has also been a recent trend of high performance computing. The objective of this paper is to introduce a parallel process system which consists of general purpose finite element analysis solver as well as parallelized PC cluster. The parallel processing system is constructed using thirty-two processing elements and the finite element program is developed by adopting hierarchical domain decomposition method. In order to verify the efficiency of the established system, an impact analysis on thin and complex sub-parts of flat display modules is performed. The evaluation results showed a good agreement with the corresponding reference solutions, and thus, the parallel process system seems to be a useful tool for the complex structural analysis such as IT related products.
다공형상이 존재하는 가압기의 피로수명평가 및 응력분류선 유효성 분석
최신범(S.B. Choi),박영재(Y.J. Park),장윤석(Y.S. Chang),최재붕(J.B. Choi),김영진(Y.J. Kim),이진호(J.H. Lee),정해동(H.D. Jeong),설광원(K.W. Seul) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.11
The present research deals with stress analyses and fatigue life evaluation of a new complex pressurizer that includes perforated parts due to various piping and subcomponents. At first, preliminary two- and three-dimensional finite element analyses were carried out to assess the feasibility of an effective elastic modulus. Then, the appropriateness of stress classification line prescribed in ASME Sec. Ⅲ & Ⅷ and WRC Bulletin 429 as non-mandatory appendices was reviewed. Finally, after categorizing stress components, the stress intensities and cumulative usage factors at critical points of pressurizer were calculated through main analyses and compared with corresponding allowable design criteria in ASME code.