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박석주(Park S. C),제해광(Je H. K),이금주(Yi G. J),박영범(Park Y. B),박경일(Park K. I) 한국마린엔지니어링학회 2010 한국마린엔지니어링학회 학술대회 논문집 Vol.2010 No.10
A method for the identification of structural characteristic parameters of a steel bar in the matrices form such as stiffness matrices and mass matrices from frequency response function(FRF) by genetic algorithm is proposed. As the method is based on the finite element method(FEM), the obtained matrices have perfect physical meanings if the FRFs got from the analysis and the FRFs from the experiments were well coincident each other. The identified characteristic matrices from the FRFs with maximun 40% of random errors by the genetic algorithm are coincident with the characteristic matrices from exact FEM FRFs well each other.
박석주(Park, S.C.),제해광(Je, H.K.),이금주(Yi, G.J.),박영범(Park, Y.B.),박경일(Park, K.I.) 한국소음진동공학회 2010 한국소음진동공학회 논문집 Vol.20 No.10
A method for the identification of structural characteristic parameters of a steel bar in the matrices form such as stiffness matrices and mass matrices from frequency response function(FRF) by genetic algorithm is proposed. As the method is based on the finite element method(FEM), the obtained matrices have perfect physical meanings if the FRFs got from the analysis and the FRFs from the experiments were well coincident each other. The identified characteristic matrices from the FRFs with maximun 40 % of random errors by the genetic algorithm are coincident with the characteristic matrices from exact FEM FRFs well each other. The fitted element diameters by using only 2 points experimental FRFs are similar to the actual diameters of the bar. The fitted FRFs are good accordance with the experimental FRFs on the graphs. FRFs of the rest 9 points not used for calculating could be fitted even well.
부분구조합성법에 의한 동력전달 변환기의 진동해석에 관한 연구
박영철,박석주,왕지석 韓國海洋大學校 附設 海洋科學技術硏究所 1999 硏究論文集 Vol.8 No.-
As shipbuilding industry hans being developed so far the industrial structure in korea also has been making surprising upturn and reform. To keep up with the up-to-date technology of the advanced shipbuilding industry, continuous researches and study have priority over the investment and promotion which have relation to minimize noise, vibration, shape, and expense. In this paper I intend to minimize the weight of a converter with unchanged natural frequency about light weighted ship which supports the weight of propeller shaft and has enough stiffness vibration originated from the motion of the propeller shaft. The weight minimization is performed by the Sensitivities of the Natural frequencies of the converter. To decrease a power transmission converter weight ideally, the parts of the sensitivity zero are to be but mainly, and the changing quantity of natural frequency by the cut is to be recovered by the structural modification for the parts with the good sensitivity. But, as actually the mathematical solution for the homogeneous problem( i. e. 0 object function) do not exist, we hereby redesign a converter with much thinner thickness and recover the natural frequencies and natural modes to original structure's by the sensitivity analysis. And the Frequency Response Function(FRF) are to bo observed for the interesting points. In the analysis, the original thickness of a converter model has 84mm of thickness, and the thickness is 60mm and 70mm. And we are to try to recover the 1, 2, 4 lower natural frequencies interested.
거대 구조물의 국부진동계의 등가계 산출과 이를 이용한 최적구조변경법
박석주,오창근,황문주,김성우 韓國海洋大學校 附設 海洋科學技術硏究所 1998 硏究論文集 Vol.7 No.-
It is very difficult to execute the vibration analysis of a huge structure, which takes up much time and expense. In this paper we intend to make the equivalent system of a local vibration system of a huge structure with a view to improving the dynamic characteristics and reducing time and expense. First of all, upper deck structure model is maded. And we perform the vibration analysis by the Substructure Synthesis. Method and execute the exciting test for the upper deck structure model, and observe the coincidences of two results to confirm the reliability of the analyzing tools used. To make the equivalent system, we give boundary condition to sub-structure that want to be modified and execute the Sensitivity Analysis Method and the Optimum Structural Modification Method. and we execute the structural modification of the equivalent system. The following can be found from this study. 1. The analytical results are generally coincident with each other. 2. The equivalent system of the superstructure model can be easily obtained using the sensitivity analysis method and the optimum structural modification method. 3. The structural modification using the equivalent system can be obtained good results above 90% of object value.