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강성 불균일이 조화가진을 받는 주기적 구조물의 동특성에 미치는 영향
안태길(Ahn, T.K.) 한국소음진동공학회 2005 한국소음진동공학회 논문집 Vol.15 No.12
Periodic structures can be applied as a MEMS(micro-electro-mechanical system) sensor or actuator due to low energy loss and wideband frequency response. The dynamic behavior of a mistuned periodic structure Is dramatically changed from that of a perfectly tuned periodic structure. The effects of mistuning, coupling stiffness, and driving point on the forced vibration responses of a simple periodic structure ate investigate4 through numerical simulations. On the basis of that, one can design effective and reliable MEMS components using periodic structures.
안태길(T.K. Ahn),이상훈(S.H. Lee),박지헌(J.H. Park),정효진(H.J. Jung),김진우(J.W. Kim),이현복(H.B. Yi) 한국도시철도학회 2016 한국도시철도학회논문집 Vol.4 No.4
An axle bearing is one of the most important components to guarantee the service life of a rail vehicle. In order to ensure the stable and reliable bearing life, it is essential to estimate the fatigue life of an axle bearing under the loading conditions. The fatigue life of a bearing is affected by many parameters such as material properties, heat treatment, lubrication conditions, operating temperature, loading conditions, bearing geometry, the internal clearance of bearing, and so on. Because these factors are so complicatedly related with each other, it is very important to investigate the effects of these factors on the axle bearing life. This paper presents the process of estimating the fatigue life of a railroad roller bearing, taking into account geometric parameters of the bearing in the life calculation. On the basis of the process, the effects of bearing geometric parameters on the fatigue life are analyzed using Taguchi method.
박차식,안태길,박경우,김도형,차귀수,서정식,Park, C.S.,Ahn, T.K.,Park, K.W.,Kim, D.H.,Cha, G.S.,Seo, J.S. 한국초전도저온학회 2009 한국초전도저온공학회논문지 Vol.11 No.3
The thermal characteristics of quench propagation is a crucial problem for the stability of the superconductor. The objective of this study is to simulate the quench propagation with the variation of disturbance energy in Bi-2223/Ag HTS pancake coil. In this analysis, the temperature-time trace of a point away from heater was calculated under conditions of different quench energy. The critical disturbance energy between quench propagation and quench recovering was calculated, In addition, the minimum quench energy with different transport currents was obtained through the present simulation. These results are significant to the application of HTS.