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Modified Ant Colony Optimization for Topology Optimization of Geometrically Nonlinear Structures
유광선,한석영 한국정밀공학회 2014 International Journal of Precision Engineering and Vol. No.
Standard Ant Colony Optimization (ACO) algorithm cannot provide an optimal topology for geometrically nonlinear structuralproblems. The reason is that the tangential stiffness matrix of low-density elements may become zero or negative, which leads toserious numerical instability problems, or the standard ACO algorithm cannot search the really efficient elements because of improperelement search method. A modified ant colony optimization (MACO) algorithm is suggested to improve computational efficiency andsuitability of standard ACO algorithm in topology optimization for these problems. A continuous variable, called the “ElementContribution Significance (ECS),” is introduced, which serves to replace the positions of ants in the standard ACO algorithm, andassess the importance of each element in the optimization process. The optimized topologies based on MACO algorithm are comparedto those of the other topology methods. From the comparison, it is verified that MACO algorithm can successfully be applied totopology optimization for geometrically nonlinear structures, as well as provide stable and robust topologies.
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유광선,박정완,히다카 신이치,한석영,Yoo, Kwang-Seon,Park, Jeong-Wan,Sinichi, Hidaka,Han, Seog-Young 한국생산제조학회 2010 한국생산제조학회지 Vol.26 No.1
Optimum design of movable hydraulic crane's booms for weight reduction was performed in this study. Since the boom weight of the present used booms is very heavy, it is needed to make them lighter structure as possible as we can. Optimum design was performed for the booms by changing from the hexagonal cross section to triangular truss structure under the conditions, which are the allowable stress for the present cross section must be maintained, and the optimized weight must be minimized. CATIAV5 was used for stress analysis and design variables were established as the height and width of the triangular truss structure. As the results, it is found that the height of the truss structure is increased in proportion to the height of the booms and the maximum stress for optimal truss structure was obtained as 412MPa, which is lower than the allowable stress for the present hexagonal cross section. The optimized weight of the booms is reduced to about 19.88% comparing to the original weight.
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Topology optimum design of compliant mechanisms using modified ant colony optimization
유광선,한석영 대한기계학회 2015 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.29 No.8
A Modified ant colony optimization (MACO) algorithm was suggested for topology optimal design of compliant mechanisms sincestandard ACO cannot provide an appropriate optimal topology. In order to improve computational efficiency and suitability of standardACO algorithm in topology optimization for compliant mechanisms, a continuous variable, called the “Element contribution significance(ECS),” is employed, which serves to replace the positions of ants in the standard ACO algorithm, and assess the importance of eachelement in the optimization process. MACO algorithm was applied to topology optimizations of both linear and geometrically nonlinearcompliant mechanisms using three kinds of objective functions, and optimized topologies were compared each other. From the comparisons,it was concluded that MACO algorithm can effectively be applied to topology optimizations of linear and geometrically nonlinearcompliant mechanisms, and the ratio of Mutual potential energy (MPE) to Strain energy (SE) type of objective function is the best fortopology optimal design of compliant mechanisms.
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우주탐사 탑재체 보정을 위한 플라즈마 발생장치의 개발 및 초기 운용 결과
유광선,차원호,신구환,이준찬,Oyama Koh-Ichiro 한국항공우주학회 2015 한국항공우주학회 학술발표회 논문집 Vol.2015 No.11
우주플라즈마 관측 탑재체의 성능시험이나 보정을 위해서는 이와 유사한 우주환경을 지상에 인위적으로 만들어 사전 실험을 수행하여, 관측 결과의 신뢰도를 향상시키는 것이 중요하다. 본 연구에서는 중형 진공챔버에 백 디퓨전 타입의 플라즈마 발생장치를 추가 장착하여 우주 플라즈마 모사장치를 제작하고, 이에 대한 초기 운용 결과를 제시하였다. 플라즈마 발생여부를 확인하기 위하여, 랑뮤어 탐침을 제작하여 챔버 내부에 장착하여 플라즈마의 발생을 확인하였으며, 향후 다양한 우주탐사 탑재체 보정에 활용하기 위한 안정화 연구를 수행할 예정이다. In order to qualify the functional tests or calibration of space plasma instruments, it is important to perform ground experiments in artificially-made plasma environment. In this study, we developed a space plasma facility by adding a back-diffusion-type plasma generation unit to a mid-size vacuum chamber. By using Langmuir probe installed inside the vacuum chamber, the generation of the plasma similar to the space environment were validated. The researches to stabilize the plasma generation for calibrations of space plasma instruments will be followed.
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