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한석영(S.Y.Han),이경래(K.L.Lee),배현우(H.W.Bai) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.11_2
In this study. the growth-strain method was used for shape optimization. The adequate value of growth ratio in the method was used the value obtained by volume control. And the linear PID control theory was applied to control stress required by a designer. The effect of the values of Kp. K_I. and K_D was investigated and the adequate values of Kp. K_I. and K_D were determined empirically. Finally. a shape optimal design system was built up by the improved the growth-strain method with a commercial software I-DEAS. The effectiveness and practicality of the developed shape optimal design system was' verified by some examples.
한석영(S.Y.Han),배현우(H.W.Bai) 한국자동차공학회 1998 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1998 No.11_2
The purpose of this study was to develop a new element removal method for ESO (Evolutionary Structural Optimization) which is one of topology optimization methods. In case of ESO the element removal ratio was fixed throughout topology optimization by 1 or 2%. As a result it has no flexibility for various types of structures and thus the rate of convergence might not be efficient. Also the results of topology optimization were obtained differently due to the element removal ratio. In this paper, a new element removal method was developed by adding and removing elements bi-directionally. Then it was applied to a short cantilever, a bracket and a vertical cantilever with overall stiffness constraints. From the results, it was verified that the rate of convergence was very improved and the optimal designed structures was obtained very similar to the results of ESO with the fixed element removal ratio of \%.<br/>