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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.
[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.