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도시철도에서 열차제동하중이 레일표면 열화에 미치는 영향
양태경(Tae-Kyoung Yang),오희완(Hee-Wan Oh),성덕룡(Deok-Yong Sung),최진유(Jin-Yu Choi),박용걸(Yong-Gul Park) 한국철도학회 2011 한국철도학회 학술발표대회논문집 Vol.2011 No.10
The rail surface irregularity is generated severely by train braking effect in the section of station. The braking force increases slip rate and friction factors caused by wheel-rail contact points. It brings rail surface irregularity as well. In this study interactions between wheel and rail were investigated using rolling contact fatigue theory and mechanism of rail degradation through fracture mechanics. For the more the Von-Mises stress occurred on the rail due to the interaction between wheel and rail was analyzed using 3-D finite element method. The amounts of surface irregularity of rail were measured according to accumulated passing tonnage in urban railway in fields. Therefore the maintenance of rail should be separated by running and braking sections to prevent RCF defects.
양태경(Tae-Kyoung Yang),성덕룡(Deok-Yong Sung) 한국도시철도학회 2017 한국도시철도학회논문집 Vol.5 No.1
In urban railways where the distance between stations is short and the interval of train dispatch is short, rail surface defects occur more frequently in the station area than in the train travel area. In this study, the finite element analysis simulating the frictional heat generated by the braking force of the train was performed and the rolling contact fatigue damage rate was analyzed by deriving the stress in the rail according to the braking force of the train. The maximum stress at 6.8mm from the rail surface and the increase of the braking force to 100, 200 and 300% compared to when the train traveled at 100km/h resulted in the rolling contact fatigue damage on the rail surface Increased about 6~28%, and increased about 3~12% at the depth of about 6.8mm from the rail surface. Therefore, the rail grinding operation to control the degradation of the rail surface caused by the contact between the wheel and the rail is proposed to distinguish between the train travel zone and the braking zone.
탄화규소 단결정 성장 시 종자정 도핑농도 영향에 따른 결정 다형변화 연구
박종휘,양태경,이상일,정정영,박미선,이원재,Park, Jong-Hwi,Yang, Tae-Kyoung,Lee, Sang-Il,Jung, Jung-Young,Park, Mi-Seon,Lee, Won-Jae 한국전기전자재료학회 2011 전기전자재료학회논문지 Vol.24 No.10
In this study, SiC single-crystal ingots were prepared on two seed crystals with different doping level by using the physical vapor transport (PVT) technique; then, SiC crystal wafers sliced from the grown SiC ingot were systematically investigated to find the effect of seed doping level on the doping concentration and crystal quality of the SiC. To exclude extra effects induced by adjustment of the process parameters, we simultaneously grew the SiC crystals on two seed crystals with different level, which were fabricated from previous two SiC crystal ingots.
성덕룡(Deok-Yong Sung),김상진(Sang-Jin Kim),양태경(Tae-Kyoung Yang),장기성(Ki-Sung Jang),박용걸(Yong-Gul Park) 한국철도학회 2011 한국철도학회 학술발표대회논문집 Vol.2011 No.5
The vibration resulting from railway operation is transmitted through the tunnel to adjacent buildings and the transmitted vibration radiates structure-borne noise which is causing a lot of public complaints by its negative effects to the buildings near tunnel. This study performed the parametric study about sleeper space and track support stiffness in order to reduce vibration on the concrete track and near structures. In this study, it was compared and performed vibration analysis and field test about these. In addition, as changing the sleeper space and track support stiffness, vibration of the structures was evaluated. Via this study, in terms of reducing the figure of the sleeper space and track support stiffness to the half, as vibrating acceleration transmitted through concrete round is getting reduced, it transmitted through the tunnel was analysed to the same phenomena. In conclusion, suggested track structure into this study, it can be applied to the track structure of existing line, and it is expected to be a new effective anti-vibration method to prevent public complaints.