Aerodynamic noise of high-speed train pantographs: Comparisons between field measurements and an updated component-based prediction model

Liu, Xiaowan; Zhang, Jin; Thompson, D.J.; Iglesias, Eduardo Latorre; Squicciarini, Giacomo; Hu, Zhiwei; Toward, Martin; Lurcock, Daniel

doi:10.1016/j.apacoust.2020.107791

Cited by 23 publications

(9 citation statements)

References 44 publications

(115 reference statements)

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“…Liu studied the aerodynamics of high-speed train running through the transition section of windbreaks through CFD analysis and observed that 1) the aerodynamic performance remains relatively steadly stable when it travels in cuttings and embankments; 2) in crosswind circumstance, the pressure, force and moment coefficients significantly grow, the train exhibits continuous yaw and the front car undergoes the most severe swinging [3]. Muñoz-Paniagua and Garcí a utilized genetic algorithms for optimizing aerodynamics of the high-speed train head in two distinct cases where two trains pass by and one train is affected by crosswind, respectively.…”

Section: Crosswind Effectmentioning

confidence: 99%

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Analysis of Aerodynamics on High-speed Trains

Tian

2024

HSET

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As a matter of fact, the high-speed trains have become an important intercity transportation tool due to their efficiency, safety, and convenience in recent years. However, compared to conventional tree operation at a low velocity, the high-speed railway requires lots of new features. Among different requirement, the aerodynamic behavior of high-speed trains is crucial for their design. With this in mind, this study will briefly introduce the latest progress in the aerodynamic research of high-speed trains based on analysis of principles, simulation results as well as experimental results. To be specific, this study will analyze the train intersection, crosswind effect, tunnel effect, aerodynamic noise, aerodynamic drag, and induced wake, etc. According to the analysis, the current limitations will also be clarified and evaluated. At the same time, the future prospects will be demonstrated and proposed based on the evaluations. Overall, these results shed light on guiding further exploration of high speed trains.

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Section: Crosswind Effectmentioning

confidence: 99%

“…Efficient, safe and comfortable high-speed trains are the most appropriate choice to meet these needs. According to the recent developing trend, high-speed railways will play a key role in the future transportation system [1][2][3].…”

Section: Introductionmentioning

confidence: 99%

Analysis of Aerodynamics on High-speed Trains

Tian

2024

HSET

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“…In the railway industry, electrified equipment can be divided into primary equipment responsible for the production, transmission, distribution and use of electrical energy according to their functions, and secondary equipment responsible for detection, measurement, control, protection and regulation, to realize the provision of energy to the railway power system [18]. The improvement of the degree of electromechanical integration in the railway industry makes the mechanical structure of EMUs more simplified, the layout more reasonable, and the vehicle performance is also improved [19].…”

Section: Aerodynamicmentioning

confidence: 99%

Dynamic Behaviour Analysis of Emu Train Entering and Exiting Tunnels Using Aerodynamic Load Data

2021

IJOMAM

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To study the change of aerodynamic load pressure when the EMU (Electric Multiple Unit) enters and exits the tunnel, the corresponding aerodynamic equation is established. By analysing the development process of EMU trains under mechatronics, a research background for the air pressure problem caused by the speed increase of high-speed trains is displayed. Furthermore, the aerodynamic problems and related pressure waves in the tunnel of the training group are introduced. Based on the aerodynamic load data, the lateral vibration characteristics of the train are analysed. It is proposed that after the train enters the tunnel, the surrounding air generates pressure waves and expansion waves due to the restriction of the train surface and the tunnel wall. Subsequently, the Bernoulli equation is used to calculate the pressure values of the train under different running conditions in the tunnel. Finally, the ANSYS Fluent fluid calculation software is used to simulate the aerodynamics of the train tunnel of the EMU. The results show that, affected by space constraints and air compressibility, when the train enters the tunnel, the compression wave changes from three-dimensional to one-dimensional. After the head of the train enters the tunnel, the average pressure value at the cross-section of x=2D increases rapidly. At t=0.011 second, the average pressure of the cross-section increases slowly, and the rate of change reaches the maximum. At t=0.027 second, the average pressure of the cross-section reaches the maximum. When the train approaches the cross-section, the pressure value at the sampling point close to the train body changes much greater than the change rate of the other two sampling points. The simulation results show that the transverse force of the train in the tunnel is 0.45Kn. Therefore, when the train travels in the tunnel, it will be subject to more complicated aerodynamic load conditions. This study will provide references for studying the aerodynamics of high-speed trains passing through tunnels.

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“…Due to the tendency of increasing vehicle speed, research about railway vehicle noise is today mainly focused on the analysis of aerodynamic noise [1,2]. However, noise generated during the braking phases can be very annoying for passengers within the vehicles and on station platforms, especially for underground systems [3] due to sound reflections generated in tunnels that increase sound pressure for a given sound power.…”

Section: Introductionmentioning

confidence: 99%

Troubleshooting Noise and Vibration Issues of a Metro Braking System

Megna

Bracciali

2023

J. Vib. Eng. Technol.

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Purpose The braking system used on a recently upgraded metro vehicle showed very high low-frequency noise and vibrations levels in service affecting passengers’ comfort and leading to both brake calliper lever failures and to premature wear of brake pads. The characteristics of the phenomenon were such that it was classified as a groan noise type. As brake pads with different characteristics were tested trying to attenuate the issue without success, the paper describes the approach adopted by the authors to tackle the issue. Methods The dynamic behaviour of all the components involved during the braking phase (wheelset, callipers, brake discs and part of the bogie frame) was analysed by numerical simulations and tests during service, finding a coincidence of the natural frequencies of the wheelset and the brake support. As this resonance was believed to be the root cause of the problem, a number of structural modifications were proposed. Results and Conclusions After a careful selection process that included robustness and sensitivity analyses, the accepted modification proved to be effective in solving the issue and was applied with satisfaction to the whole fleet.

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Aerodynamic noise of high-speed train pantographs: Comparisons between field measurements and an updated component-based prediction model

Cited by 23 publications

References 44 publications

Analysis of Aerodynamics on High-speed Trains

Analysis of Aerodynamics on High-speed Trains

Dynamic Behaviour Analysis of Emu Train Entering and Exiting Tunnels Using Aerodynamic Load Data

Troubleshooting Noise and Vibration Issues of a Metro Braking System

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