• Title, Summary, Keyword: 차체연직가속도

Search Result 4, Processing Time 0.112 seconds

Deflection Limit on Vibration Serviceability of High-speed Railway Bridges Considering the Effect of Train Speed (열차주행속도를 고려한 고속철도교량의 수직변위에 대한 진동사용성 한계(기준) 연구)

  • Jeon, Bub-Gyu;Kim, Nam-Sik;Kim, Sung-Il
    • Proceedings of the Computational Structural Engineering Institute Conference
    • /
    • /
    • pp.473-476
    • /
    • 2011
  • 본 논문에서는 열차와 교량의 상호작용과 주행속도에 의해 결정되어지는 진동지속시간과 차체연직가속도 증폭효과를 고려하여 철도교량의 진동사용성 허용처짐을 제시하고자 하였다. 열차가 교량을 통과할 때의 처짐 형상을 사인파로 가정하고 열차와 교량의 상호작용을 진동전달함수로 표현하여 철도교량의 진동 사용성 허용처짐을 유도하였다. 그리고 진동지속시간을 고려하기 위해 연직가속도 허용기준으로서 진동지속시간을 고려한 교량구조물의 진동사용성기준을 사용하였다. 매개변수연구를 통하여 열차 주행속도의 증가에 비례하여 차체연직가속도는 증가하지만 교량최대변위의 변화는 미미함이 확인됨으로 인하여 차체연직가속도 증가와 동반하여 연직가속도 허용기준역시 증가하는 것을 보정할 필요가 있을 것으로 판단하였다. 따라서 전개된 철도교량의 진동사용성 허용처짐식에 매개변수연구를 통하여 가정한 가속도 증폭계수를 적용하여 열차의 증속에 의한 가속도증폭효과를 고려하였다.

  • PDF

Deflection Limit based on Vibration Serviceability of Railway Bridges Considering the Correlation between Train Speed and Vertical Acceleration on Coach (열차의 주행속도와 차체연직가속도의 상관관계를 고려한 철도교량의 진동사용성 처짐 한계)

  • Jeon, Bub-Gyu;Kim, Nam-Sik;Kim, Sung-Il
    • Journal of the Korean Society for Railway
    • /
    • v.14 no.6
    • /
    • pp.545-554
    • /
    • 2011
  • In order to get dynamic serviceability of a train travelling on a railway bridge, comfort limits with the deflection of bridge and vertical acceleration on car body are proposed in Eurocode, Shinkansen design criteria, The design guideline of the Honam High-speed railway. The design guideline of the Honam High-speed railway has quoted Eurocode. Therefore it is expected that supplementation of comfort limit of railway bridge according to expansion of span length and the improvement traveling speed of trains in the future would relatively fall behind developed countries in railway. Therefore, in order to secure technological competitiveness in world market, the study was conducted to propose the deflection limit based on vibration serviceability of railway bridges that can consider bridge-train interaction and travelling speed increase. The parameter study and bridge-train dynamic interaction analysis was conducted to figure out the correlation of vertical acceleration on car body and bridge displacement according to the increase in travelling speed. Also, the trend of increasing vertical acceleration on car body according to the increase in travelling speed was confirmed, and the amplification coefficient of vertical acceleration on car body was suggested. And the deflection form and vibration of the bridge were assumed to be in harmonic motion, and transfer function and the amplification coefficient were used to develop the dynamic serviceability deflection limit of the high-speed railway bridge as a formula.

Deflection Limit for a Maglev Railway Guideway Considering Ride Comfort (승차감을 고려한 자기부상철도 가이드웨이 구조물의 처짐 한계)

  • Lee, Jin Ho
    • Journal of the Computational Structural Engineering Institute of Korea
    • /
    • v.33 no.6
    • /
    • pp.367-374
    • /
    • 2020
  • A standard for the vibration magnitude of a maglev train is presented herein to ensure a comfortable ride for the passengers. The vibration magnitude is determined from the vertical acceleration of the car body. A parameter analysis of the maglev train system is then performed considering the vehicle-structure interaction, and a deflection limit of L/1300 is proposed to satisfy the standard for the vertical acceleration. The proposed deflection limit is applied to the dynamic analysis of the actual maglev train system to assess applicability. Compared with the existing standard for the guideway structure, the proposed deflection limit is expected to enable economical design and construction.

Deflection Limits based on the Vibration Serviceability of Guideway Structures Considering Maglev Train-Guideway Interaction (자기부상열차와 가이드웨이 상호작용을 고려한 가이드웨이 구조물의 진동사용성 처짐 한계)

  • Lee, Jin Ho;Kim, Sung Il
    • Journal of the Korean Society for Railway
    • /
    • v.20 no.1
    • /
    • pp.111-119
    • /
    • 2017
  • In this study, deflection limits based on the vibration serviceability of guideway structures are proposed considering maglev train-guideway interaction. Equations of motion are derived for a simplified maglev railway. Feedback constants for the control of the electromagnetic force for levitation are optimized in order to minimize the airgap fluctuations. Deflection limits for a guideway are calculated for various operating speeds of a maglev train, span lengths of a guideway, and natural frequencies and damping ratios of the second suspension in order to satisfy the serviceability criteria for airgaps and for the vertical acceleration of a cabin. From the analysis results, proposed are requirements for the second suspension of maglev trains and deflection limits for guideway structures.