• 한국철도학회논문집
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• 제10권5호
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• pp.613-618
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• 2007

철도차량의 곡선주행성능은 유지보수관점에서 매우 중요하다. 곡선주행성능과 관련된 대차의 조향성능은 실차를 이용한 실선로 주행시험이 적전하나 차량 개발단계에서는 이를 검증하기가 용이하지 않다. 따라서 차량의 조향 특성을 효율적으로 시험하기 위한 축소 곡선트랙에 대한 연구를 수행하였다. 대차의 곡선 주행을 모사하기 위한 곡률반경 $200{\sim}250m$의 급곡선과 등가인 1/5 scale 규모의 축소 곡선트랙을 설계, 제작하였다. 1/5 scale 대차를 이용한 주행시험 시험결과 곡선 주행특성이 비교적 잘 반영되고 있음을 확인하였다.

• Wind and Structures
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• 제35권2호
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• pp.83-92
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• 2022

When the rolling stocks run on the curve, the external rail has to be lifted to a certain level to balance the centrifugal force acting on the train body. Under such a situation, passengers may feel uncomfortable, and the slanted vehicle has the potential overturning risks at high speed. This paper conducted a wind tunnel test in an annular wind tunnel with φ=3.2 m based on a 1/20^th scaled high-speed train (HST) model. The sensitivity of Reynolds effects ranging from Re = 0.37×10⁶ to Re = 1.45×106 was tested based on the incoming wind from U=30 m/s to U=113 m/s. The wind speed covers the range from incompressible to compressible. The impact of roll angle ranging from γ=0° to γ=4° on train aerodynamics was tested. In addition, the boundary layer development was also analyzed under different wind speeds. The results indicate that drag and lift aerodynamic coefficients gradually stabilized and converged over U=70 m/s, which could be regeared as the self-similarity region. Similarly, the thickness of the boundary layer on the floor gradually decreased with the wind speed increase, and little changed over U=80 m/s. The rolling moment of the head and tail cars increased with the roll angle from γ=0° to γ=4°. However, the potential overturning risks of the head car are higher than the tail car with the increase of the roll angle. This study is significant in providing a reference for the overturning assessment of HST.