Stability Evaluation on Aerodynamics of High Speed Railway Train

Choi, Jung-Youl; Park, T.W.; Sim, Kyung Seok; Kwak, Myounghai; Lee, D.H.

doi:10.5050/ksnve.2012.22.3.244

Cited by 2 publications

(4 citation statements)

References 10 publications

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“…Then, the relationship of the cross-wind frequency to the natural frequency of a vehicle was evaluated. The main content in this study is to predict the behavior of a railway vehicle using theoretical calculations, and the aerodynamic coefficients and cross-wind condition were referred to in previous studies [21][22][23] and the regulation [24] on driving conditions of high-speed trains in Korea.…”

Section: Vehicle Dynamicsmentioning

confidence: 99%

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Prediction of Theoretical Derailments Caused by Cross-Winds with Frequency

2021

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In this paper, theoretical derailment equations for cross-wind with frequency were derived to assess running safety. For a KTX (Korean high-speed train) unit, the wheel unloading ratios, which are the criteria for evaluating derailments in UIC (International union of railways) and TSI (Technical Specification for Interoperability) regulations, were calculated through the formula under the driving regulations according to cross-wind speeds, and the theoretical results were compared and evaluated through a multibody dynamics (MBD) simulation. In addition, the wheel unloading ratios were calculated for various frequencies of cross-winds. As a result of the formula and MBD, the wheel unloading ratios were shown to increase rapidly regardless of the dampers in suspension when the cross-wind frequency and the natural frequency of a vehicle were in agreement. Finally, we calculated the changes of wheel unloading ratio for different track gauges and found that these theoretical equations could calculate more accurate results than the existing Kunieda’s formula. The formula derived in this study has the advantage of considering various variables, such as fluctuant cross-winds, rail irregularities, and derailment behaviors, which were not considered in previous studies or Kunieda’s formula. It could be used for setting suspensions or railway vehicle specifications in the initial design stage.

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Section: Vehicle Dynamicsmentioning

confidence: 99%

“…The operating regulations of the KTX for cross-wind speeds are enforced, as shown in Table 7, to prevent derailments [24].…”

Section: Operating Regulations Of the Ktx According To Wind Speedmentioning

confidence: 99%

Prediction of Theoretical Derailments Caused by Cross-Winds with Frequency

2021

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“…Choi et al. 8 simulated the stability of the HEMU-430X train under crosswinds using the side force aerodynamic coefficient calculated through computational fluid dynamics. Using the 3 km track irregularity data measured from Gyeongbu High-Speed Railway, they studied the safety of the vehicle traveling on a curve with a radius of curvature of 7000 m with crosswind speeds at 15, 30, and 45 m/s.…”

Section: Introductionmentioning

confidence: 99%

“…Thomas et al 7 focused on the lateral dynamics and side forces of railway vehicles when the crosswind blowing at an average of 7.8 m/s suddenly increased to 23.6 m/s in the intersection zone of the end of the transition curve and the beginning of the circular curve. Choi et al 8 simulated the stability of the HEMU-430X train under crosswinds using the side force aerodynamic coefficient calculated through computational fluid dynamics. Using the 3 km track irregularity data measured from Gyeongbu High-Speed Railway, they studied the safety of the vehicle traveling on a curve with a radius of curvature of 7000 m with crosswind speeds at 15, 30, and 45 m/s.…”

Section: Introductionmentioning

confidence: 99%

Effect of wind gusts on the dynamics of railway vehicles running on a curved track

You

Kwon

Park

et al. 2017

Proceedings of the Institution of Mechanical Engineers, Part F:

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Due to global warming, there is an increasing number of wind gusts that affect the stability of railway vehicles. A railway vehicle running on a curved track during a wind gust is subjected to multiple forces simultaneously, which include the centrifugal force and forces exerted by the wind gust and cant, and they significantly affect the vehicle’s dynamic characteristics as well as its safety. The forces increase the vibration of carbodies and the risk of derailment and overturning of cars; the effect is worse on irregular tracks. In order to review the phenomenon in detail, a 1/20 scale model of a railway vehicle was built to measure the aerodynamic coefficients in five directions—side force, lift force, roll moment, pitch moment, and yaw moment—through a wind tunnel test. The data collected were applied as external forces to a full-scale railway vehicle model traveling on a curved track. Using a multibody simulation software program, SIMPACK, a railway vehicle was modeled, which was then used in the simulation of the dynamic characteristics and safety of vehicles while traveling on a curved track during a wind gust. Using the actual measured track data from the curved zone, a comparison was made on the dynamic characteristics of the car traveling, with and without a wind gust, on a curved track with a railway curve radius of 599 m; also, the difference was analyzed with the direction of the wind gust blowing from inside and toward the center of curvature. The results showed that in the presence of a wind gust blowing from outside the curvature with an average speed of 25 m/s it is advisable to stop train services on grounds of safety.

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Stability Evaluation on Aerodynamics of High Speed Railway Train

Cited by 2 publications

References 10 publications

Prediction of Theoretical Derailments Caused by Cross-Winds with Frequency

Prediction of Theoretical Derailments Caused by Cross-Winds with Frequency

Effect of wind gusts on the dynamics of railway vehicles running on a curved track

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