• Title/Summary/Keyword: 열-구조 연성해석

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A Study on the 1-Way FSI Analysis for Shutter of Side Jet Thruster (측추력기 Shutter의 단방향 유체-구조 연성해석에 관한 연구)

  • Ko, Jun Bok;Seo, Min Kyo;Lee, Kyeong Ho;Baek, Ki Bong;Cho, Seung Hwan
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.38 no.12
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    • pp.1359-1365
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    • 2014
  • In this study, 1-way fluid structure interaction analysis(FSI) for the shutter, component of side jet thruster was performed to evaluate the safety. Driving torque to open nozzle, thermal and high pressure load of hot gas was applied to shutter. Thus, the shutter must be designed to endure this load during combustion. We carried out computational fluid dynamics analysis to obtain the pressure, temperature, and heat transfer coefficient of hot gas of side jet thruster. We then used the data as the load condition for a thermal structural analysis using a mapping method. The locations with the maximum stress and temperature distributions were found. We compared the maximum stress with the tensile stress of shutter material according to temperature to evaluate the safety. We also analyzed the radial deformation of the shutter to set the proper interface gap with the side jet thruster parts.

Analysis of Structural and Thermal Parameters for Evaluating Fire Resistance of Steel Beams (철골보의 내화시간 평가를 위한 구조 및 열적 변수해석)

  • Park, Han Na;Ahn, Jae Kwon;Lee, Cheol Ho
    • Journal of Korean Society of Steel Construction
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    • v.21 no.6
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    • pp.609-618
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    • 2009
  • This paper proposes a versatile formula which can be used to evaluate the fire resistant time of steel beams under various design conditions. Towards this end, the key parameters which affect the fire performance of steel beams were first determined through thermo-mechanical considerations, and classified into two groups: structural parameters and thermal parameters. Then the degree of influence of each parameter on the fire performance was investigated through a fully coupled thermo-mechanical analysis up to the occurrence of run-away deflection. The accuracy of the numerical model used was verified using an available full-scale fire test before conducting an extensive parametric analysis. Multiple linear regression analysis was performed to obtain the formula which can be used to predict the fire resistance time of steel beams under various design conditions. The statistical analysis showed that the proposed formula is very robust. The application of the formula in practical fire design under the current code was illustrated in detail. The economy and other advantages of the proposed formula were clearly shown.

Thermal-Structure Interaction Parallel Fire Analysis for Steel-Concrete Composite Structures under Bridge Exposed to Fire Loading (화재에 노출된 교량하부 강합성 구조물에 대한 열-구조 연성 병렬화재해석)

  • Yun, Sung-Hwan;Gil, Heungbae;Lee, Ilkeun;Kim, Wooseok;Park, Taehyo
    • Journal of the Computational Structural Engineering Institute of Korea
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    • v.26 no.4
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    • pp.283-292
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    • 2013
  • The objective of this research is to evaluate of global and local damage for steel-concrete composite structures under highway bridge exposed to fire loading. To enhance the accuracy and efficiency of the numerical analysis, the proposed transient nonlinear thermal structure interaction(TSI) parallel fire analysis method is implemented in ANSYS. To validate the TSI parallel fire analysis method, a comparison is made with the standard fire test results. The proposed TSI parallel fire analysis method is applied to fire damage analysis and performance evaluation for Buchen highway bridge. The result of analysis, temperature of low flange and web are exceed the critical temperature. The deflection and deformation state show good agreement with the fire accident of buchen highway bridge.

Structural optimization and numerical analysis of multiphysics system (멀티 피직스 시스템 해석과 구조 최적 설계)

  • Yoon, Gil-Ho
    • Proceedings of the Computational Structural Engineering Institute Conference
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    • 2009.04a
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    • pp.157-160
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    • 2009
  • 멀티 피직스 시스템은 구동을 수치적으로 해석하기 위하여 두 개 이상의 연성이 되어 있는 물리계를 고려해야하는 시스템을 일컫는다. 대표적인 예로 기계 분야에서 현재까지 많이 연구되어 왔던 열탄성(Thermal/Structure)과 유체/구조 연성(Fluid/Structure)시스템을 들 수 있다. 또한 현재 차세대 성장산업으로 많은 관심이 집중되고 있는 의료기기나 지능형 자동차와 로봇 등에서 사용되는 다양한 센서와 엑추에이터 등도 특별한 예로 들 수 있다. 특히, 한 개의 물리계 해석으로 시스템 해석이 가능한 기존의 일반적인 기계 시스템과는 달리 MEMS 등의 초소형 시스템은 시스템의 거동을 수치적으로 계산하기 위하여 여러 물리계의 연성을 고려해야 한다는 점에서 대표적인 다물리계 시스템의 예로 들 수 있다. 이렇게 우리생활에 밀접하게 쓰이고 있는 멀티 피직스 시스템은 단일 물리계 시스템과 비교하여 엔지니어의 경험에 의존하여 설계(Design)하기가 어려운 특성이 있다. 이에 이 연구 논문에서는 이런 멀티 피직스 시스템을 해석하고 최적화 하기위한 노력을 소개한다.

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Topology Design Optimization of Nonlinear Thermo-elastic Structures (비선형 열탄성 연성구조의 위상 최적설계)

  • Moon, Min-Yeong;Jang, Hong-Lae;Kim, Min-Geun;Cho, Seon-Ho
    • Journal of the Computational Structural Engineering Institute of Korea
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    • v.23 no.5
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    • pp.535-541
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    • 2010
  • In this paper, we have derived a continuum-based adjoint design sensitivity of general performance functionals with respect to Young' modulus and heat conduction coefficient for steady-state nonlinear thermoelastic problems. An adjoint equation for temperature and displacement fields is defined for the efficient computation of the coupled field design sensitivity. Through numerical examples, we investigated the mesh dependency of the topology optimization method in the thermoelastic problems. Also, comparing the dominant loading cases of thermal and mechanical ones, the loading dependency of topology design optimization in coupled multi-physics problems is investigated.

Parametric Study of Gas Turbine Engine Disc using Axisymmetry and Sector Analysis Model (축대칭 및 섹터 해석 모델을 활용한 가스터빈 엔진 디스크의 형상 변수 고찰)

  • Huh, Jae Sung
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.37 no.6
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    • pp.769-774
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    • 2013
  • 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.