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장서영(Seo Young Jang),정재일(Jay I. Jeong) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
In this paper, a mathematical model of roller-type bearings previously studied is reviewed in order to apply the correct bearing stiffness. The mathematical models based on Hertz contact theory that is suggested by Popov[1] was selected as stiffness models for simulation. To verify the formula model, a displacement/force graph was created through finite element analysis of a roller model with the same boundary conditions as the boundary line used in the formula. The result of the formula was compared with simulations. As a result of the analysis, the Popov equation model more closely matched the results of the finite element analysis. When the displacement was within 10 micrometers, the result was within the error range of 8.8%.
김도현(Dohyun Kim),김문영(Moonyoung Kim),정재일(Jay I. Jeong) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
In this paper, structural and thermal analysis are conducted to determine the effect of molten recycled plastic on moving between metal filters. Structure and thermal deformation of the metal filter should be analyzed since the fluid flow through a metal filter has a high-temperature, high-viscosity and high-pressure. Fluid solid interaction method (FSI) is used to reveal a coupling phenomenon between solids and fluids. The FSI analyzes the effect of fluid boundary conditions on metal filters. Pressure, flow rate, and temperature of the recycled plastic filter is used as the boundary condition of the FSI analysis. The largest deformation at the center of the filter, major stresses are observed at the inlet and outlet of each micro hole.
박영걸(Young Gul Park),원종진(Chongjin Won),정재일(Jay I. Jeong) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.11
In this study, an elastic network model is established in order to find dominant factors which reflect thermostability of protein structures. The connections in the elastic network model are selected with respect to the free energy between alpha-carbons, which is representatives of residues in the elastic network model. We carried out normal mode analysis and compared eigenvalues of the stiffness matrix from the elastic network model. In most cases, thermophilic proteins are observed to have higher values of lowest natural frequency than mesophiles and psychrophiles have. As a result, the thermophiles are calculated to be stiffer than other proteins in view of dynamic vibration.
박성종(Seong-jong Park),김경훈(Kyoung-hoon Kim),정재일(Jay I. Jeong) (사)한국CDE학회 2013 한국 CAD/CAM 학회 학술발표회 논문집 Vol.2013 No.8
This paper suggests driving stability evaluation of electric vehicles through the vehicle dynamic modeling and simulation. Two dynamic models of the gasoline vehicle and the electric vehicle are established and compared. The physical properties of the chassis system for the both vehicles are measured by using laser scanner device. The three dimensional position of the hard points, bushing and spring-damper characteristics and so on are measured for both vehicles. In addition, the methodology for driving performance evaluation is concerned. After analyzing the accident frequency and accident contribution by the actual driving database, this paper adopts the scenarios for driving stability evaluation. The scenarios based on ISO and ECE standards are simulated. Comparison of the results will help to design the chassis system of the electric vehicle with respect to the reliability.
UV 나노임프린트리소그래피의 정렬 공정 중 몰드의 변형해석
박인수(Insoo Park),원종진(Chongjin Won),임홍재(Hongjae Yim),정재일(Jay I. Jeong) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.11
Deformation of a mold is measured and analyzed in alignment and curing processes of UV-Imprint Lithography. We are focused on mold deformation caused by a UV resin, which is laminated between a mold and a target glass-panel. The UV resin is viscous in case of liquid state, and the resin will be solidified when being exposed by the ultra-violet light. The viscosity of the resin causes shear force on the mold during the alignment process. Moreover, the shrinkage during phase change from liquid to solid may cause residual stress on the mold. The experiments for measuring temperature and strain are made during alignment and curing process. Strain-gages and thermocouples are used for measuring the strain and variation of temperature on several points of the mold, respectively. The deformation of mold is also simulated and analyzed. The simulation results are compared with the experiments. Finally, sources of alignment errors in large area UVnanoimprint lithography are discussed.