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RISS 인기검색어
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- 저자 : 이정욱(J. W. Yi) (검색결과 2 건)
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김용일(Y. I. Kim),이정욱(J. W. Yi),박경진(G. J. Park) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.4
Sensitivity information has been used for linearization of nonlinear functions in optimization. Basically,<br/> sensitivity is a derivative of a function with respect to a design variable. Design sensitivity is repeatedly<br/> calculated in optimization. Since sensitivity calculation is extremely expensive, there are studies to directly<br/> use the sensitivity in the design process. When a small design change is required, an engineer makes design<br/> changes by considering the sensitivity information. Generally, the current process is performed one-by-one<br/> for design variables. Methods to exploit the sensitivity information are developed. When a designer wants<br/> to change multiple variables with some relationship, the directional derivative can be utilized. In this case,<br/> the first derivative can be calculated. Only small design changes can be made from the first derivatives.<br/> Orthogonal arrays can be used for moderate changes of multiple variables. Analysis of Variance is carried out<br/> to find out the regional influence of variables. A flow is developed for efficient use of the methods. The<br/> sensitivity information is calculated by finite difference method. Various examples are solved to evaluate the<br/> proposed algorithm.
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신정규(J.K.Shin),이정욱(J.W. Yi),이해주(H.J. Lee),박경진(G.J. Park) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.5
A rotor bar in an induction motor for electric railway is studied from a design viewpoint. The design<br/> process is divided into two stages; conceptual design and detailed design. In conceptual design, overall<br/> configuration is determined. A computer program is developed for the conceptual design. Various formulae<br/> are developed for analysis. They are derived from elementary and advanced elasticity. Design equations are<br/> made from the formulae and they are programmed with Graphic User Interface (GUI) for user convenience.<br/> Structural optimization is adopted for the detailed design. Finite element method is used for analysis. A design<br/> problem is defined to minimize mass or maximum stress while constraints are satisfied.
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