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반응면 기법을 이용한 초음속 전투기 날개의 다학제간 다점 설계
김유신(Y. S. Kim),김재무(J. M. Kim) 한국전산유체공학회 2004 한국전산유체공학회 학술대회논문집 Vol.2004 No.-
In this study, the multidisciplinary aerodynamic~structural optimal design is carried out for the supersonic fighter wing. Through the aeroelastic analyses of the various candidate wings, the aerodynamic and structural performances are calculated such as the lift coefficient, the drag coefficient and the deformation of the wing. In general, the supersonic fighter is maneuvered under the various flight conditions and those conditions must be considered all together during the design process. The multi-point design, therefore, is deemed essential. For this purpose, supersonic dash, long cruise range and high angle of attack maneuver are selected as representative design points. Based On the calculated performances of the candidate wings, the response surfaces for the objectives and constraints are generated and the supersonic fighter wing is designed for better aerodynamic performances and less weights than the baseline. At each design point, the single-point design is performed to obtain better performances. Finally, the multi-point design is performed to improve the aerodynamic and structural performances for all design points. The optimization results of the multi-point design are compared with those of the single-point designs and analyzed in detail.
김유신(Y.S Kim),전창훈(C.H Jun),김명훈(M.H Kim),최형식(H.S Choi) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.4
This paper aims at the development of shoes measuring the performance of walking or running, which is<br/> equipped with electronic devices. In the in-sole of the shoes, a piezoelectric sensor is inserted for measuring<br/> the number of steps and the speed of walking. The measured signals are processed by the one-chip microprocessor<br/> and related electronic devices. Using the data, the momentum and calories of walking and running<br/> are calculated, and the results are transmitted to the displaying system composed of LCD by the RF<br/> telecommunication system.
압력조건의 변화에 따른 PEMFC의 성능 시뮬레이션 및 설계에 관한 연구
김홍건(H. G. Kim),김유신(Y. S. Kim),김홍열(H. Y. Kim),양성모(Y. M. Yang),나석찬(S. C. Nah) 한국생산제조학회 2005 한국공작기계학회 추계학술대회논문집 Vol.2005 No.-
Fuel cells are devices that convert chemical energy directly into electrical energy. Among many kinds of the fuel cell, Polymer electrolyte membrane fuel cell is such kind of thing which work under low temperature. Unfortunately, there are still many problems to be solved in order to make them into commercial use, such as the thermal and water management in working process of Polymer electrolyte membrane fuel cell. To solve the difficulties facing the researcher, the analysis of the inner mechanism of Polymer electrolyte membrane fuel cell should be implement as much as possible, mathematical modeling is an important tool for the reach of the fuel cell especially with the combination of experiment. By regarding some of the assumptions and simplifications, using the finite element technique, a two-dimensional electrochemical mode is created in this paper for the further comparison with experiment data. Based on the principals of the problem, the equation of electronic charge conservation equation, gas-phase continuity equation, and mass balance equation are used in calculating. In the end, the model results indicate the some of the phenomenon in the unit cell, and the relationships of potential and current density.
박영민(Y. M. Park),정진덕(J. D. Chung),김유신(Y. S Kim),최성욱(S. W. Choi) 한국전산유체공학회 2004 한국전산유체공학회 학술대회논문집 Vol.2004 No.-
Numerical optimization method of long endurance airfoil has been performed with a RSM(Response Surface Method) for smart UAV wing design. For the base line airfoil, NACA 64621 airfoil was selected and optimized to satisfy long endurance condition for smart UAV, Aerodynamic coefficients required for RSM are obtained by using 2-D Navier-Stokes solver with Spalart- Allmaras turbulence model. The optimized airfoil showed increased maximum lift and endurance factors together with reasonable thickness ratio.