On the feasibility of a component-based approach to predict aerodynamic noise from high-speed train bogies

Iglesias, Eduardo Latorre; Thompson, D.J.; Paniagua, Jorge Muñoz; Garcı́a, Javier Garcı́a

doi:10.1016/j.apacoust.2023.109536

Applied Acoustics

2023

DOI: 10.1016/j.apacoust.2023.109536

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On the feasibility of a component-based approach to predict aerodynamic noise from high-speed train bogies

Eduardo Latorre Iglesias

D.J. Thompson

Jorge Muñoz Paniagua

et al.

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2024

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Cited by 2 publications

References 30 publications

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Characteristics of the flow around finite wall-mounted square cylinders and the mechanism of tonal noise

Wang,

Ma,

et al. 2024

Physics of Fluids

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Motivated by the need to reduce the noise from train pantographs, numerical simulations are carried out for the flow over finite wall-mounted square cylinders with different aspect ratios at a Reynolds number of 1.5×104. Five aspect ratios (height-to-width ratios) are taken into account, namely, 1.4, 4.3, 7.1, 10, and 12.9. The effect of the aspect ratio on the aerodynamic coefficients, the near-wall flow topologies, and the pressure distributions are studied in detail to give insight into the noise generation mechanisms. The pressure rate of change dp/dt on the cylinder surfaces is adopted to evaluate the dipole noise source. It turns out that distributions of dp/dt are closely related to flow evolutions near the free ends and the wall-mounting junctions of cylinders with different aspect ratios. High levels of dp/dt are found close to lateral trailing edges of the cylinder, while the strength grows quickly as the aspect ratio is increased. The far-field noise emitted from these cylinders is predicted using the Ffowcs Williams–Hawkings acoustic analogy and validated with wind tunnel measurements available in the literature. For receivers located in the cross-flow direction, a single acoustic tone near a Strouhal number of 0.1 is observed for cylinders with aspect ratios not greater than seven, while an additional tone at a higher Strouhal number occurs as the aspect ratio is further increased. The underlying mechanism of the tonal noise emitted to the far field is also investigated by combining the noise source localization and dynamic mode decompositions.

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Characteristics of the flow around finite wall-mounted square cylinders and the mechanism of tonal noise

Wang,

Ma,

et al. 2024

Physics of Fluids

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Analysis of train-induced aerodynamic characteristics and pressure-relief measures relating to fully enclosed noise barriers installed on railway bridges

Cai,

Zhan,

et al. 2024

Physics of Fluids

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Fully enclosed noise barriers (FENBs) are increasingly being installed on high-speed railway bridges for noise pollution control. However, the aerodynamic effects of high-speed trains passing FENBs have an adverse impact on barrier durability and generate micro-pressure waves. In this paper, a numerical model of a train passing an FENB on a bridge is established. The aerodynamic pressure distribution along the FENB is analyzed for both a single train and two trains passing one another. The propagation characteristics and evolution mechanisms of pressure waves are then investigated. The results show that the pressure is lower at the ends of the FENB and higher in the middle along the direction of train travel. The peak positive and negative pressures at the mid-span are 1.95 and 4.47 times higher than those at the ends, respectively. This distribution is caused by the propagation, superposition, reflection, and attenuation of pressure waves. Compression waves account for 78.9% of the peak positive pressure. An amplification factor must be considered when estimating the impact of two trains passing one another. Analysis of five pressure-relief schemes shows that arranging a single pressure-relief hole at a high-pressure location effectively alleviates the over-pressure in the FENB. The overall pressure-relief effect is an exponential function of the single opening area. Considering a constant opening area, arranging several relief holes at equal spacing optimizes the adverse pressure distribution compared with the single-hole relief scheme. The equivalent forces of the multi-hole scheme are 3.35% and 7.58% lower than in the single-hole scheme.

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On the feasibility of a component-based approach to predict aerodynamic noise from high-speed train bogies

Cited by 2 publications

References 30 publications

Characteristics of the flow around finite wall-mounted square cylinders and the mechanism of tonal noise

Characteristics of the flow around finite wall-mounted square cylinders and the mechanism of tonal noise

Analysis of train-induced aerodynamic characteristics and pressure-relief measures relating to fully enclosed noise barriers installed on railway bridges

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