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터빈 노즐 및 열차폐 코팅에 따른 고압 1 단 터빈 블레이드의 구조 건전성 영향에 대한 연구
허재성,강영석,이동호,Huh, Jae Sung,Kang, Young Seok,Rhee, Dong Ho 대한기계학회 2016 대한기계학회 논문집 C. 기술과 교육 Vol.4 No.2
High pressure nozzles and turbines of a gas turbine engine should be required to be operated under extreme operating conditions in order to maximize the performance. Engine manufactures have utilized nickel-base superalloys, enhanced cooling design, and thermal barrier coating techniques to overcome them and furthermore, material modeling, finite element analysis, optimization techniques, and etc. have been utilized widely for elaborate predictions. We aim to evaluate the effects on the low cycle fatigue life of the high pressure turbine blade caused by thermal barrier coatings and the cooling design of the endwall of the first stage turbine nozzle. To achieve it, the structural analysis, which utilized the results of conjugate heat transfer analysis as loading boundary conditions, was performed and then the results were the input for the assessment of low cycle fatigue life at several critical zones.
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태권도공연단원의 심리적 주인의식이 역할수행 및 공연성취도에 미치는 영향
허재성(Huh, Jae-Sung),임신자(Lim, Sin-Ja) 한국체육과학회 2015 한국체육과학회지 Vol.24 No.3
The purpose of this study was to examine the effects of Taekwondo performance group members’ psychological ownership on role performance and performance achievement. To attain the goal, the authors collected the questionnaires of 237 members who belong to eight Taekwondo demonstration groups and performance groups. For data analysis, PASW/WIN ver 21.0 was utilized to perform frequency analysis, exploratory factor analysis, reliability test, correlation analysis and multiple regression analysis. The study has gained the following results: first, ownership of their job which is a factor of Taekwondo performance group members’ psychological ownership, exerted effects on communication, effort amplification, feedback, understanding, and coordination. And ownership of their organization, the other factor of Taekwondo performance group members’ psychological ownership, indicated effects on communication, effort amplification, coordination aside from feedback and understanding. Second, ownership of their job showed effects on psychological, physical, technical achievement, and ownership of their organization had effects on psychological, technical achievement. Third, it was found communication, effort amplification, coordination which are the factors of role performance showed effect on psychological achievement. Also, effort amplification and coordination exerted effect on physical achievement. Feedback showed effects on physical and technological achievement.
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반응표면을 활용한 통계적 모멘트 추정 방법과 신뢰도해석에 적용
허재성(Jae-Sung Huh),곽병만(Byung-Man Kwak) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.11
A new and efficient method for estimating the statistical moments of a system performance function has been developed. The method consists of two steps: (1) An approximate response surface is generated by a quadratic regression model, and (2) the statistical moments of the regression model are then calculated by experimental design techniques proposed by Seo and Kwak⑷. In this approach, the size of experimental region affects the accuracy of the statistical moments. Therefore, the region size should be selected suitably. The D-optimal design and the central composite design are adopted over the selected experimental region for the regression model. Finally, the Pearson system is adopted to decide the distribution type of the system performance function and to analyze structural reliability.
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축대칭 및 섹터 해석 모델을 활용한 가스터빈 엔진 디스크의 형상 변수 고찰
허재성(Jae Sung Huh) 대한기계학회 2013 大韓機械學會論文集A Vol.37 No.6
가스터빈엔진의 핵심 부품인 디스크와 블레이드는 고효율, 수명주기 동안의 운용비 최소화 등의 요구조건으로 고온의 터빈입구 온도, 고압축비, 고속 환경에서 지속적으로 운용된다. 이러한 가혹한 환경에서의 구조 안전성을 평가하기 위해서는 재료 모델링과 유한요소해석 기법 등이 필수적이며 더 나아가 형상최적화가 반드시 요구된다. 본 연구에서는 터빈 디스크의 구조 건전성을 평가하기 위해 2 차원 축 대칭 및 섹터 모델을 생성하고, 열-구조 연성해석과 접촉 해석을 포함한 유한요소 해석을 수행하고자 한다. 이를 근거로 터빈 디스크에서 구조적으로 취약한 2 개의 영역인 디스크 보어와 디스크와 블레이드의 연결 부위인 도브테일에 대해 형상변수 고찰을 하고자 한다. 최종적으로 형상변수 결과를 기초로한 개선된 디스크 형상을 제안함과 동시에 좀 더 정교한 형상최적화가 필요함을 확인한다. Turbine blades and disc, which are one of the most important rotating parts of a gas turbine engine, are required to have highly efficient performance in order to minimize the total life cycle costs. Owing to these requirements, these components are exposed to severe conditions such as extreme turbine inlet temperatures, high compression ratios, and high speeds. To evaluate the structural integrity of a turbine disc under these conditions, material modeling and finite element analysis techniques are essential; furthermore, shape optimization is necessary for determining the optimal solution. This study aims to generate 2D finite element models of an axisymmetry model and a sector one and to perform thermal-structural coupled-field analysis and contact analysis. Structurally vulnerable areas such as the disc bore and disc-blade interface region are analyzed by a parametric study. Finally, an improved design is provided based on the results, and the necessity of elaborate shape optimization is confirmed.
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