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한석영(S.Y.Han),하광태(K.T.Ha) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.11_2
In this study, genetic algorithm(GA) was applied to structural optimization. When the parameters of GA were improperly selected, the efficiency may become very poor. In order to improve the efficiency of GA, the proper ranges and influences of the parameters were examined. The ranges of parameters obtained were applied to optimization of practical structures with discrete or integer variables. Also, the shape optimization of a short cantilever given vertical load was performed. It was verified that GA was an appropriate method for structural optimization with discontinuous variables.
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),이경래(K.L.Lee) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.6_2
In this study. growth-strain method was used for shape optimization. The effect of growth ratio h in the method was investigated and the adequate value of h was determined. And the linear PID control theory was applied to control volume required by a designer. The adequate values of K_P. K_I. and K_D were determined empirically. Finaly. a shape optimal design system was built up by the improved 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.<br/>
한석영(S.Y.Han),송교봉(K.B.Song),이준정(J.J.Yi) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.6_1
The purpose of this study is to develop a functional high speed rolling oil for cold rolled steels. The required properties of a functional rolling oil are good lubricity and anti-seizure property, oxidation stability, and mill cleanness property etc. under the rolling conditions of high reduction ratio and high rolling speed. Six kinds of test oils were blended. Evaluation of lubricity and anti-seizure property of the test oils were carried out with a laboratory scale rolling mill. And laboratory evaluation for dispersion, contamination, anti-oil stain property and residual carbon, etc. were carried out with several testers such as long-term circulation tester, coulter counter and conradson tester. A functional high speed cold rolling oil was developed by comparing with the previously developed high speed cold rolling oil.<br/>
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/>