Evaluation of the Aerodynamic Effect of a Smooth Rounded Roof on Crosswind Stability of a Train by Wind Tunnel Tests

Reyes, C.E.A.; Brambilla, Elia; Tomasini, Gisella Marita

doi:10.3390/app13010232

Cited by 3 publications

(1 citation statement)

References 13 publications

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“…To study aerodynamics and design aircrafts, wind tunnels, especially the continuous transonic wind tunnel (CTWT), have become indispensable. Over the past two decades, the research and practical application of wind tunnels have received increasing attention, as they are widely applied in many fields based on aerodynamic theories [1,2] and in the design of many artifact including bridges [3], buildings [4], trains [5] and aircrafts [6][7][8]. It should be especially noted that wind tunnel experimentation has great significance for wind farm research, as it can help to model the inter-farm cluster interaction of the wind power base [9].…”

Section: Introductionmentioning

confidence: 99%

Mach Number Prediction for 0.6 m and 2.4 m Continuous Transonic Wind Tunnels

2023

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With the development of the design technology, more and more advanced and diverse wind tunnels have been constructed to match complex requirements. However, it is hard to design a precise physical model of a wind tunnel that can be controlled. In addition, if a new wind tunnel is designed, the experimental data may be insufficient to build a controlling model. This article reports research on the following two models: (1) for a 0.6 m continuous transonic wind tunnel supported by a large amount of historical data, the false nearest neighbor (FNN) algorithm was adopted to calculate the order of the input variables, and the nonlinear auto-regressive model with the exogenous inputs–backpropagation network (NARX-BP) was proposed to build its Mach number prediction model; (2) for a new 2.4 m continuous transonic wind tunnel with only a small amount of experimental data, the method of model migration, the input and output slope/bias correction–particle swarm optimization (IOSBC-PSO) algorithm, was developed to convert the old model of the 0.6 m wind tunnel into the new model of the 2.4 m wind tunnel, so that the new Mach number prediction could be conducted. Through simulation experiments, it was found that by introducing the NARX-BP algorithm to build the Mach number prediction model, the root-mean-square error (RMSE) of the model decreased by 44.93–77.90%, and the maximum deviation (MD) decreased by 64.05–85.32% compared to the BP model. The performance of the IOSBC-PSO migration model was also better than that of the non-migration model, as evidenced by the 82.06% decrease of the RMSE value and the 78.25% decrease of the MD value. The experiments showed the effectiveness of the proposed strategy.

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Section: Introductionmentioning

confidence: 99%

Mach Number Prediction for 0.6 m and 2.4 m Continuous Transonic Wind Tunnels

2023

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Effects of different aerodynamic configurations on crosswind stability of a conventional train

Araya Reyes,

Rocchi,

Tomasini

et al. 2023

Journal of Wind Engineering and Industrial Aerodynamics

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Research on the Uplift Characteristics of Pantographs of High-Speed Trains Under Crosswind Conditions

Zhao,

Duan,

Lan

et al. 2024

Applied Sciences

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Through the geometric relationships and force analysis of the main components of pantographs on high-speed trains, the coefficients of aerodynamic forces and lift transmission between the pantograph and main components under crosswind conditions were derived. Based on the aerodynamic forces acting on the pantograph at different crosswind speeds, wind angles, and operating speeds, the aerodynamic lift of the pantograph and main components was ultimately determined. The results indicate that the aerodynamic lift of the pantograph is mainly distributed on the bow structure, with the aerodynamic lift of the upper frame all being negative values, while the absolute value of the aerodynamic lift of the lower arm rod is the smallest. The operating speed of the pantograph and the wind angle of the crosswind have a significant impact on the aerodynamic lift of the main components, while the impact of the crosswind speed is relatively small. At the same operating speed of the pantograph, the lower the corresponding crosswind speed, the smaller the aerodynamic lift of the pantograph. The aerodynamic lift of the pantograph tends to decrease gradually with the increase in crosswind speed, and the impact of crosswind speed decreases gradually with the increase in the pantograph operating speed. A comprehensive relationship formula between the aerodynamic lift of the pantograph and the operating speed, crosswind speed, and wind angle is obtained, and the empirical formula for the contact force of the bow net and train operating speed is modified. The research results are of great significance and value for the study and application of lift forces on pantographs under crosswind conditions.

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Evaluation of the Aerodynamic Effect of a Smooth Rounded Roof on Crosswind Stability of a Train by Wind Tunnel Tests

Cited by 3 publications

References 13 publications

Mach Number Prediction for 0.6 m and 2.4 m Continuous Transonic Wind Tunnels

Mach Number Prediction for 0.6 m and 2.4 m Continuous Transonic Wind Tunnels

Effects of different aerodynamic configurations on crosswind stability of a conventional train

Research on the Uplift Characteristics of Pantographs of High-Speed Trains Under Crosswind Conditions

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