Numerical–experimental approach for evaluating cross-wind aerodynamic effects on heavy vehicles

Cheli, Federico; Belforte, P.; Melzi, Stefano; Sabbioni, Edoardo; Tomasini, Gisella Marita

doi:10.1080/00423110600886689

Cited by 49 publications

(40 citation statements)

References 3 publications

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“…In fact, real crosswind scenarios are unsteady and involve fluctuating wind speeds. Unsteady models, such as the "Chinese Hat" wind gust model (CEN, 2010) or the "stochastic process" crosswind model (RSSB, 2000;Cheli et al, 2006;Xu and Ding, 2006), should be considered for use in future research.…”

Section: Discussionmentioning

confidence: 99%

“…The second issue, which was investigated in this study, has not received much attention in previous studies. Many efforts have been made to use multi-body dynamic models to study the characteristic wind curves, which represent critical crosswind speeds, at which the selected derailment criteria reach their limits and vehicle overturning occurs (Orellano and Schober, 2003;Cheli et al, 2006;Xu and Ding, 2006). Typically, quasi-steady approaches are proposed for use in calculating the wheel loading reduction caused by crosswind forces.…”

Section: Introductionmentioning

confidence: 99%

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

Xiao

Ling

Xiong

et al. 2014

J. Zhejiang Univ. Sci. A

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Abstract:A coupled vehicle-track dynamic model is put forward for use in investigating the safety effects of crosswinds on the operation of a high-speed railway vehicle. In this model, the vehicle is modeled as a nonlinear multi-body system, and the ballasted track is modeled as a three-layer discrete elastic support system. The steady aerodynamic forces caused by crosswinds are modeled as ramp-shaped external forces being exerted on the vehicle body. This model was used in a numerical analysis of the dynamic response and dynamic derailment mechanisms of high-speed vehicles subjected to strong crosswinds. The effects of the crosswind speeds, crosswind attack angle, and vehicle speed on the operational safety of the vehicle were examined. The operational safety boundaries of a high-speed vehicle subjected to crosswinds were determined. The numerical results obtained indicate that crosswinds at attack angles of 75° to 90° with respect to the forward direction of the vehicle have a great influence on the safety of operating high-speed railway vehicles. The wheelset unloading limit, which determines the position of the warning boundary dividing the safe operating area and the warning area, is the most conservative, i.e., the safest, criterion to use in assessing the high-speed operational safety of vehicles in crosswinds.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

Xiao

Ling

Xiong

et al. 2014

J. Zhejiang Univ. Sci. A

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“…The CWC of the freight wagons is computed using a stochastic approach, developed by the research group of the Politecnico di Milano [2,5]. This method is based on the numerical simulation of the dynamics of a vehicle subjected to the action of a real turbulent wind.…”

Section: Computational Procedures Of the Characteristic Wind Curvementioning

confidence: 99%

“…In the first step, the wind speed as a function of the time and the space is defined, according to a stochastic procedure, for specific values of turbulence intensity, integral length scale and mean wind speed [2,5].…”

Section: Computational Procedures Of the Characteristic Wind Curvementioning

confidence: 99%

“…Data obtained during this research phase were then used as in-put for a numerical model [5,2] allowing to investigate the interaction between the wagon and the turbulent wind. Finally, Characteristics Wind Curves for the wagon are identified for the most critical train-set compositions verifying the forces exchanged through the connection of the container to the flat-wagon.…”

Section: Introductionmentioning

confidence: 99%

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A Study of the Influence of Aerodynamic Loads on the Forces Exchanged in a Twistlock Corner Casting Connection of Flat-Wagons

Gialleonardo¹,

Melzi²,

Resta³

et al.

Proceedings of the Third International Conference on Railway Technology: Research, Development and Maintenance

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In this paper cross-wind effects on freight wagons are studied. A mathematical model of a freight train made up of a flat-car and one or two containers has been built defining the dynamical characteristics of the connection (twistlock-corner casting). Wind tunnel tests on a scaled model are then used to define the aerodynamic coefficients of the wagon, both in loaded and unloaded conditions, considering different trainset layouts. Wind forces are finally applied separately to the container and the flat-car in order to define the CWC of the wagon and to verify the maximum forces exchanged through the twistlock-corner casting connection. The results of the analysis showed that severe conditions with respect to the risk of rollover can be found as a result of a succession of empty and loaded wagons.

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Advanced Numerical Simulation of Dynamic Behavior of Railway Infrastructure Under Extreme Conditions

Zhai,

2024

Digital Innovations in Architecture, Engineering and Construction

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Numerical–experimental approach for evaluating cross-wind aerodynamic effects on heavy vehicles

Cited by 49 publications

References 3 publications

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

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

A Study of the Influence of Aerodynamic Loads on the Forces Exchanged in a Twistlock Corner Casting Connection of Flat-Wagons

Advanced Numerical Simulation of Dynamic Behavior of Railway Infrastructure Under Extreme Conditions

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