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윤성호(S. H. Yoon),윤영근(Y. K. Yoon) 한국자동차공학회 2003 한국 자동차공학회논문집 Vol.11 No.3
Vibration analysis using component mode synthesis method was carried out to identify that to some extent each component contributed to the whole vibration of a powertrain consisting of several components. This analysis helped decide the component to be modified to reduce the powertrain weight, without degrading its current vibration characteristics. As a result, a cylinder block was chosen as a redesign object. Topology optimization analysis was performed to design the topology of the cylinder block. whose flange connected with the transmission was chosen to be the design domain. After all, a new prototype of cylinder block was manufactured based on the analysis results for the verification experiment. It was confirmed from the analytical and experimental results that an optimally designed cylinder block had an advantage ovcr the current one in the powertrain weight, with the powertrain vibration characteristics improved slightly.
[論文] 흡기다기관 시스템의 구조진동 저감에 대한 연구
윤성호(S.H.Yoon),이귀영(K.Y.Lee) 한국자동차공학회 1992 오토저널 Vol.14 No.5
Vibration of intake manifold is important as it could worsen the noise levels radiated from surface itself and support bracket, and it eventually leads to the failures of a Throttle Position Sensor and an Idle Air Control Valve. In this study, structural modification method is proposed to reduce structural vibration of an intake manifold system. At first, vibration problems are identified through tests on a running engine. Then modal data acquired by modal testing and finite element analysis are helpful to understand vibration mechanism of the system, and used as the design guide when structural modifications are attempted. After the system model is validated by comparison of the modal data obtained from analysis and experiment, iterative calculations are performed to find optimized structure of the system by finite element analysis. As a result, a newly designed plenum bracket is suggested in such a way that the intake manifold is stiffened, and that design of the support bracket is changed in terms of bolting position, thickness, shape, and minimum weight increase. Finally, it is shown that a new design achieves a significant reduction of vibration of an intake manifold system and it is confirmed by tests on a running engine.
윤성호(S H Yoon),조덕형(T H Cho) 한국자동차공학회 2002 한국 자동차공학회논문집 Vol.10 No.5
Dynamic deformation or the cylinder bore during actual engine operation has an important effect on the combustion gas scaling, oil consumption, friction and so on. The dynamic analysis using the finite element method is performed to investigate the dynamic deformation of the cylinder bore subjected to forced vibration under excitation of the combustion gas pressure. However, this analysis requires large computer memory and tremendous solving time. The pseudo-static analysis can be an alternative to the dynamic analysis at the expense of accuracy. Dynamic analysis and static analysis results are presented for both closed-deck block and open-deck block that are respectively combined with the cylinder block, cylinder head, transmission, and oil pan.<br/>
13Cr - 1.5Nb - Fe 스텐레스 센서재료의 제조 및 연자기특성
윤성호(S. H. Yoon),김택기(T. K. Kim),조용수(Y. S. Cho) 한국자기학회 1998 韓國磁氣學會誌 Vol.8 No.3
13Cr-1.5Nb-Fe alloy powder was fabricated by water atomization method, and ring-shape specimen of this composition was fabricated by oil press, and then sintered in the vacuum furnace. Powder shape, size distribution, composition (C, N, O, S) analysis and saturation magnetization of as-prepared 13Cr-1.5Nb-Fe alloy powder were investigated. Ac permeability and power loss was measured after forming and sintering process. Saturation magnetization and contents of oxygen of the alloy powder is 160 emu/g and about 6000 ppm, respectively. 50 % volume fraction indicate particle size of 70 ㎛. The ac permeability of sintered specimen increases with increasing sintering temperature and forming pressure. The power loss is 107 W/cc at sintering temperature of 1200 ℃, 12 ton/㎠ forming pressure, and 20 ㎑. It is the lowest among the prepared specimen.
윤성호(Sung Ho Yoon),박희원(Hee Won Park),홍순지(Sun Ji Hong),이종근(Jong Keun Lee),(M . R . Kessler),(S . R . White) 한국복합재료학회 2002 Composites research Vol.15 No.2
본 연구에서는 자가치료제를 저장할 수 있는 마이크로캡슐을 제조하기 위한 공정절차를 제시하고 자가치료제가 저장된 마이크로캡슐을 제조하였다. 이때 자가치료제는 DCPD(dicyclopentadiene), 마이크로캡슐은 요소-포름알데히드 수지로 구성되어 있으며 레이저 회절법을 이용한 입도분석기를 통해 마이크로캡슐의 크기와 입도분포를 측정하였다. 또한 DSC를 통해 자가치료제, 마이크로캡슐 박막을 형성하는 요소-포름알데히드의 수지, 자가치료제가 저장된 마이크로캡슐 등에 대한 열분석을 수행하였으며 자가치료제가 저장된 마이크로캡슐에 대해 TGA를 통해 연속적인 온도증가 및 일정한 온도 조건 하에서의 열안정성을 평가하였다. 연구결과에 따르면 자가치료제가 저장된 마이크로캡슐은 마이크로캡슐의 박막이 연소되기 전까지는 박막 자체가 자가치료제의 증발을 막아 주어 자가치료제를 안정적으로 저장할 수 있음을 알 수 있었다. This study focused on the introduction of processing procedure for microcapsules loaded with the healing agent and then microcapsules with the healing agent were manufactured by experiments. The DCPD (dicyclopentadiene) was used for the healing agent and the shell of microcapsules was consisted of urea-formaldehyde resin. The magnitude and the size distribution of microcapsules were measured by a particle size analyzer using laser diffraction technique. Thermal analysis was conducted by using a DSC for the healing agent, microcapsules without the healing agent, and microcapsules with the healing agent. Also thermal stability was investigated by using a TGA under continuous and isothermal heating conditions for the healing agent, microcapsules without the healing agent, microcapsules with the healing agent. According to the results, microcapsules with the healing agent were verified to be so thermally stable that the healing agent could not evaporate until the shell of microcapsules were burned.