http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
- 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
- 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
RISS 인기검색어
- 검색키워드
- 저자 : 이슬기(S.G. Yi) (검색결과 4 건)
- 무료
- 기관 내 무료
- 유료
-
이슬기(S.G. Yi),권형일(H.I. Kwon),최성임(S.I. Choi),박부민(P.M. Park),강영석(Y.S. Kang) 한국전산유체공학회 2012 한국전산유체공학회 학술대회논문집 Vol.2012 No.5
A multidisciplinary design optimization of EAV (Electric Aerial Vehicle) propeller is carried out to maximize the efficiency of propeller performance. An objective is to minimize torque/power while maintaining a thrust level of baseline configuration at a given RPM and thus to improve propeller efficiency. Structural safety is also calculated during the design process and is ensured to satisfy a safety margin. A high-fidelity CFD and FEM-based structures computation is employed for a design. To test the accuracy of the analysis tools, a wind-tunnel test is conducted for the baseline propeller blade at operating RPM and numerical prediction is validated against experiment data. A derivative-free multidisciplinary design methodology based on the Kriging approximation model is used to achieve the design goal of minimization of torque. Design variables are mostly related to the shape of the blade and include twist distribution at eight cross sections along the blade span as well as the planform shape of the blade around tip area. Design results demonstrate a reduction of torque by almost 5% at constant thrust. Safety margin is well satisfied for a new blade.
-
이슬기(S.G. Lee),이승수(S. Lee),이주용(J.Y. Lee),엄정아(J.A. Um),이원호(W.H. Yi) 한국전산유체공학회 2020 한국전산유체공학회지 Vol.25 No.4
This paper presents the computational analysis of debris flow using multi-phase modeling and resulting impact force on the structure. The mixture of soil and water was modeled as slurry phase for various water content controlled by volume concentration of each material. Unsteady flow was solved for incompressible fluid in 3D domain and volume of fluid (VOF) method was introduced to trace the boundary between the slurry and the ambient air. Due to the shear thinning characteristics of slurry, nonlinear viscosity model was implemented. In order to verify the present method, the numerical computations were carried out for the experimental setup with the sloped channel employed in a previous study. As expected and shown in the previous experimental study, the greater impact force on the measuring plate was obtained for the larger angle of slope. In addition, the maximum impact force occurred much faster for the slurry with the higher water content. The comparison between the experimental results and the present computation shows a good agreement. It was also found that the critical water content at which the debris starts to flow was 35% at an inclination of 50° and 40% to 40°. As the result, it is expected that present method can be used to calculate the impact force of the debris flows on the structures, and can further be used for damage prediction and reduction.
-
권형일(H.I. Kwon),이슬기(S.G. Yi),최성임(S.I. Choi),김근배(K.B. Kim) 한국전산유체공학회 2012 한국전산유체공학회 학술대회논문집 Vol.2012 No.11
In this study, we present that multi-stage design framework for aerodynamic design optimization of rotary wing such as propeller and helicopter rotor blades. Strategy of the proposed framework is to enhance aerodynamic performance using both planform and sectional design optimization iteratively. In first stage of planform design, we used genetic algorithm and blade element momentum theory(BEMT) based on two dimensional aerodynamic database to find optimal planform variables in short time. After initial design, local flow conditions of blade sections are calculated. Next stage, sectional design optimization is conducted using two dimensional Navier-Stokes analysis and gradient based optimization algorithm. Mien optimal shapes are determined, planform design is performed again. Through the iterative design process, not only optimal flow condition but also optimal shape could be acquired. To validate the framework, design optimization for propeller which operated in electric vehicle system were performed As a results, about 8% of efficiency enhancement has acquired.
-
e-Science 기반 EDISON 포탈의 항공우주분야 에어포일 공력 최적 설계 프레임워크 개발
권형일(H.I. Kwon),조영민(Y.M. Jo),이슬기(S.G. Yi),김사지(S.J. Kim),최성임(S.I. Choi) 한국전산유체공학회 2012 한국전산유체공학회 학술대회논문집 Vol.2012 No.5
Design optimization is to find optimum of design space which is defined by design variables, using optimization algorithm. Recently, numerical design optimization including computational fluid dynamics (CFD) has been focused in not only aerospace engineering, but general engineering field because of many research and development for high performance computing. However it could hardly find the design optimization softwares and contents of which educational or research purposes in aerospace engineering. In this study, as one framework of EDISON DESIGN OPTIMIZATION, aerodynamic design optimization framework for an airfoil based on EDISON (EDucation-research Integration through Simulation On the Net) portal. As well as the softwares development, essential contents are also developed for the lecture associated with design optimization in the aerospace engineering. Software and contents on aerodynamic design optimization could be expected to be assisted in the lecture or lab..
연관 검색어 추천
이 검색어로 많이 본 자료
활용도 높은 자료
