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원주방향 보강재와 직교방향 보강재의 형상에 따른 원통형 쉘에 대한 진동의 최적화에 관한 연구
장진건(Jin-Geon Chang),이영신(Young-Shin Lee),김영완(Young-Wan Kim) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.11
The cylindrical shells are mainly used in the nuclear energy structure, pressure vessel, boiler and so on. When designing of shell structures, predicting the structure change under variety boundary conditions are necessary for estimating the safety .Design variables for the design engineer include multiple material systems and boundary conditions, in addition to overall structural design parameters. Since the vibration of stiffened cylindrical shell is an important consideration for structures design, the reliable prediction method and design methodology should be required. In this study, the optimum design of stiffened cylindrical shell for maximum natural frequency was studied by analytic and numerical method.
장진건(Jin-Geon Chang),이영신(Young-Shin Lee) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.11
When designing shell structures, predicting the vibration characteristics is important to estimate the safety to avoid the fracture by the resonance. In this paper, natural frequency, mode shape was studied. The comparison between FEM and modal test of the stiffened cylindrical shell was conducted. In order to optimize the vibration characteristic, subproblem approximation method was applied. Stiffened dimension of T-shape as a design variable function and volume of total stiffeners as a constraint function are used. Maximizing the fundamental natural frequency was studied in this paper. Especially, effects on the ring stiffener was studied by controlling the number of the ring stiffener. And each result was conducted by the optimization method.
장진건(Jin-Geon Chang),이영신(Young-Shin Lee),양태호(Tae-Ho Yang) 대한기계학회 2012 大韓機械學會論文集A Vol.36 No.3
보강 원통셸의 기본 고유 진동수를 최적화하기 위해서, 보강재의 개수를 1 개에서 5 개까지 보강된 원통셸에 대한 시뮬레이션을 수행하였다. 고유 진동수에 대한 최적화를 시뮬레이션하기 위해서 ANSYS 11.0 을 사용하였다. 최적화 방법으로 Subproblem Approximation Method 를 이용하였다. 최적화의 설계 함수로는 T-형 링 보강재의 기하형상이며, 제한 함수로는 보강에 따른 추가 부피가 10 % 이내로 제한하였다. 목적함수는 기본 고유진동수를 최대화하는 것이다. 최적 설계에 대한 성능 지표는 비보강 원통셸과 보강원통셸의 고유진동수와 부피의 비로서 정의하였다. 최적 성능 지수는 3 개의 보강재를 사용한 원통셸에서 나타났다. For the optimization of the fundamental natural frequency of stiffened cylindrical shells, simulations were performed for cylindrical shells that were stiffened with between one and five ring stiffeners. ANSYS 11.0 was used to simulate the optimization for the natural frequency. The Subproblem Approximation Method was applied as the optimization method. The design function of the optimization was the geometry of the T-shaped ring stiffener, and the constraint function was the maximum additional volume, constrained to a 10% increase. The objective function of the optimization was chosen to maximize the fundamental natural frequency. The performance index for optimal design was defined as the ratio of the natural frequency to the volume of the unstiffened and stiffened shells. The optimal performance index was obtained for the shell stiffened with three rings.
김흥태(Heung-Tae Kim),이영신(Young-Shin Lee),이현승(Hyun-Seung Lee),장진건(Jin-Geon Chang) (사)한국CDE학회 2010 한국 CAD/CAM 학회 학술발표회 논문집 Vol.2010 No.1
Shells or shell structures were being used many modern mechanical structures with main load transfer elements, for example, it generally used in aircraft, nuclear energy structures, submarines, building, constructions and so on. To analyze structural design characteristics of stiffened cylindrical shells were more efficient the structural design by automatic design with design parameters. In this study, the automatic design method of stiffened cylinder shells was studies by ANSYS design variables.