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[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),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.
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(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/>