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[論文] 다종의 가진방법을 이용한 비연성 경향을 가진 차실모형의 모우드 해석
김시조(S.J.Kim),조동우(D.W.Cho),김관주(K.J.Kim),한상욱(S.W.Han) 한국자동차공학회 1992 오토저널 Vol.14 No.1
Interior noise in a car is known to have an important influence on product acceptability. This noise is closely correlated with structural-acoustic vibration. When considering noise problem, the structural-acoustic relation of a vehicle cabin model needs to be identified. However, it is very difficult to get the modal parameters of this kind of cabin structure composed of thin plates: because it not only can be excited by the acoustic vibration of cavity, but also tends to have decoupling effects of one plate from another. In order to obtain modal parameters more precisely, various excitation techniques, i.e. impact, pure random, burst random, and swept sine testing are applied for the first step. In the case of the cabin model, impact and swept sine testing show good results. Next, the determination of the excitation point by trial-and-error and the accurate measurements of FRF's are performed with these methods. The modal parameter extraction is carried out for the final step. This paper proposes a new approach to find the modal parameters more reliably in the case of high decoupling effects. That is, the convergence of MIF and MCF in each panel, which provide some criteria for the validity of the obtained modal parameters, is observed. And from those results, the pretty accurate modal parameters can be determined. A comparative assessment between the modal testing and the FEM is also performed.
점탄성 이상유동에서 계면장력과 액적크기가 액적변형에 미치는 효과
김상대(S.D. Kim),우병철(B.C. Woo),김시조(S.J. Kim) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.5
The finite-element method was developed to analyze the deformation of a drop for the viscoelastic twophase<br/> flow. In the present study a viscoelastic drop suspended in a viscoelastic medium was considered, for<br/> which the Oldroyd B model was employed. The penalty function method was used to eliminate the pressure<br/> variables from the system equations. The shape of a highly deformed drop was described by using<br/> unstructured mesh generator and auto-remeshing techniques. The deformation of a drop was discussed for<br/> various sizes( R =0.2~0.4) and interfacial tensions( ξ=0.0~0.01). As a result, the deformation of a drop has<br/> tendency to be thicker and rounded at the front of a drop for the same drop size. This recoil Phenomena is<br/> increased with increasing the interfacial tension. As the drop size increases the deformation of a drop also<br/> increases, especially at the rear region of a drop, which looks like a dumbbell.
점탄성 물질을 포함한 이상 폴리머 유동 해석을 위한 그래픽 소프트웨어의 개발
우병철(B.C. Woo),김시조(S.J. Kim) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.5
The prediction of the drop deformation of a dispersed two-phase polymer blends is very important in the<br/> industrial fields, especially in the polymer processing such as injection molding and extrusion.<br/> Very recently S. J. Kim has developed FEM computer codes for this problem^(12~14). With this source<br/> program, a new graphic software was developed to treat the pre, solver, post processing in the PC base by<br/> using OpenGl and MFC. In solving the system equations, an unstructured mesh generator and auto-remeshing<br/> technique were used to show the deformation shapes of drops under the application program window.<br/> The present application program shows the high performance to improve the two-phase solver algorithm<br/> and to simulate the two-phase polymeric flow.
이상 폴리머 유동 해석을 위한 그래픽 소프트웨어의 개발
김시조,우병철 국립7개대학공동논문집간행위원회 2002 공업기술연구 Vol.2 No.-
The prediction of the drop deformation of a dispersed two-phase polymer blends is very important in the industrial fields, especially in the polymer processing such as injection molding and extrusion. Very recently S. J. Kim has developed FEM computer codes for this problem[3,4,5]. With this source program, a new graphic software was developed to treat the pre, solver, post processing in the PC base by using OpenGl and MFC. In solving the system equations, an unstructured mesh generator and auto-remeshing technique were used to show the deformation shapes of drops under the application program window.