Study on the safety of operating high-speed railway vehicles subjected to crosswinds

Xiao, Xinbiao; Ling, Liang; Xiong, Jian; Zhou, Li; Jin, Xuesong

doi:10.1631/jzus.a1400062

Cited by 25 publications

(8 citation statements)

References 21 publications

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“…Railway system dynamics studies have been performed for almost a century, resulting in thousands of papers and theoretical models being published (Knothe and Grassie, 1993;Popp et al, 1999;Evans and Berg, 2009;Zhai et al, 2009;Arnold et al, 2011;Xiao et al, 2014). Throughout previous studies, there are mainly two types of simulation models: singlevehicle/track coupling models and models for multivehicles (or trains) coupled with a rigid or nearly rigid track.…”

Section: Introductionmentioning

confidence: 99%

A 3D model for coupling dynamics analysis of high-speed train/track system

Ling

Xiao

Xiong

et al. 2014

JZUS-A

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A 3D dynamic model of a high-speed train coupled with a flexible ballast track is developed and is presented in this study. In this model, each vehicle is modeled as a 42 degrees of freedom multi-body system, which takes into consideration the nonlinear dynamic characteristics of the suspensions. A detailed inter-vehicle connection model including nonlinear couplers and inter-vehicle dampers, and the linear tight-lock vestibule diaphragm is established to simulate the effect of the end connections of neighboring vehicles on dynamic behavior. The track is modeled as a traditional three-layer discrete elastic support model. The rails are assumed to be Timoshenko beams supported by discrete sleepers. Each sleeper is treated as an Euler beam and the ballast bed is replaced by equivalent rigid ballast bodies. The reliability of the present model is then validated through a detailed numerical simulation comparison with the commercial software SIMPACK, with the effect of the track flexibility on the train/track interaction being analyzed simultaneously. The proposed model is finally applied to investigate the difference between dynamic performances obtained using the entire-train/track model (TTM) and the single-vehicle/track model (VTM). Several key dynamic performances, including vibration frequency response, ride comfort, and curving performance, calculated by the two types of dynamic models are compared and discussed. The numerical results show that there is a significant difference between the dynamic behaviors obtained by VTM and TTM, and that inter-vehicle connections have an important influence on the dynamic behavior of high-speed vehicles.

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Section: Introductionmentioning

confidence: 99%

A 3D model for coupling dynamics analysis of high-speed train/track system

Ling

Xiao

Xiong

et al. 2014

JZUS-A

Self Cite

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“…Parameter variation analyses show that fluctuation ranges of the maximum V-M stress and the Traditional multi-body approach in 2008;Xiao et al, 2014) Transient FE simulation of this work frictional work on a corrugated rail increase with the traction coefficient. This means that for the same excitation (e.g., a corrugation in this study) the irregular material response, namely the irregular plastic deformation and wear, probably becomes more severe as the friction exploitation level increases.…”

Section: Discussionmentioning

confidence: 83%

“…The vertical force obtained from the transient FE simulation is compared to that of the traditional multibody approach 2008;Xiao et al, 2014) in Fig. 28, for which a corrugation with a wavelength of 80 mm and a depth of d m =0.18 mm is considered at 500 km/h.…”

Section: Comparison With the Multi-body Approachmentioning

confidence: 99%

Modeling of high-speed wheel-rail rolling contact on a corrugated rail and corrugation development

Zhao

Wen

Heng-yu

et al. 2014

JZUS-A

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Short pitch rail corrugations were observed on a recently opened Chinese high-speed line. On the basis of field measurements and observations of corrugations occurred on the high-speed line, a 3D transient rolling contact model is developed using the explicit finite element (FE) method to investigate high-speed vehicle-track interactions in the presence of rail corrugations. The rotational and translational movements of the wheel are introduced as initial conditions in the model. The frictional rolling contact between the wheel and the corrugated rail is solved by a penalty method based surface-to-surface contact algorithm with Coulomb's law of friction. The contact filter effect is considered automatically by the finite size of the contact patch. Through specifying a time-dependent driving torque applied to the wheel axle, the tangential vehicle-track interaction on the corrugated rail is analyzed in the time domain together with the normal one at different traction levels and at rolling speeds of up to 500 km/h. This analysis focuses on detailed contact solutions, such as distributions of the pressure, surface shear stress, Von Mises (V-M) stress, and frictional work. The corrugation dimensions, traction level, and rolling speed are varied to investigate their influences, building a solid basis for further studying the material damage mechanisms. A theory is proposed based on the simulations to explain the observed phenomenon that the corrugation gradually stabilizes. The traditional multi-body approach is found to overestimate the dynamic wheel-rail interaction on a corrugated rail.

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“…A cross-wind with exciting frequency can act on vehicles due to railside structures that are repeatedly placed, as in Figure 3, when running on a bridge. However, the theoretical derailment equations due to cross-wind in the previous studies could only statically evaluate the derailment risk under a constant wind speed condition [10,19], and the fluctuant wind or gust conditions have been evaluated using a multibody dynamics simulation [15,16,20]. In this paper, a theoretical formula on the risk of derailment was derived considering cross-winds with varying wind forces generated by structures displaced at regular intervals on the trackside.…”

Section: Vehicle Dynamicsmentioning

confidence: 99%

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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Study on the safety of operating high-speed railway vehicles subjected to crosswinds

Cited by 25 publications

References 21 publications

A 3D model for coupling dynamics analysis of high-speed train/track system

A 3D model for coupling dynamics analysis of high-speed train/track system

Modeling of high-speed wheel-rail rolling contact on a corrugated rail and corrugation development

Prediction of Theoretical Derailments Caused by Cross-Winds with Frequency

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