Aerodynamic Noise Radiated by the Intercoach Spacing and the Bogie of a High-Speed Train

Fremion, Nathalie; Vincent, Nicolas; Jacob, Marc C.; Robert, Gilles; Louisot, Alain; Guerrand, Sylvie

doi:10.1006/jsvi.1999.2546

Cited by 41 publications

(24 citation statements)

References 2 publications

(2 reference statements)

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“…Experiments have shown that at low Mach numbers, deep rectangular cavities may lead to oscillations with discrete frequency peaks [111] and linear stability theory has been applied to model the feedback and scattering of the acoustic wave [112]. The experimental analysis of the intercoach region presented in Reference [34] allowed particular radiating phenomena to be identified at well-defined frequencies; the noise radiation was concentrated in the lowfrequency region below 500 Hz and dominated by various pure tones. Some solutions have been proposed to reduce the aerodynamic noise from the intercoach region.…”

Section: Other Sources 81 Inter-coach Gapmentioning

confidence: 99%

“…However, a problem with such near-field measurements is that, as well as the noise which radiates to the far field, there are strong near-field turbulent pressure fluctuations which do not radiate. A coherence technique was used in Reference [34] to determine the part of the pressure signal that radiates to the far field. …”

Section: On-board Measurementsmentioning

confidence: 99%

“…In Reference [34], on-board measurement techniques were applied on a TGV in which anti-turbulence probes were located in the bogie and intercoach regions. Unlike pass-by measurements, a signal of long duration could be acquired.…”

Section: On-board Measurementsmentioning

confidence: 99%

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Recent developments in the prediction and control of aerodynamic noise from high-speed trains

Thompson

Iglesias

Liu

et al. 2015

International Journal of Rail Transportation

118

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At speeds above 300-350 km/h, the main source of noise from trains is the aerodynamic noise caused by the air flow over the train structure. The sound level increases with train speed at a rate of between 60 and 80 times the logarithm of the speed so that, as speeds increase further, the noise increases dramatically. The main aerodynamic noise is produced by the air flow passing over the pantograph, the train nose, the bogie region and cavities such as the pantograph recess and the inter-coach gap. Experimental and numerical methods for studying aerodynamic noise are reviewed including the use of microphone arrays, wind tunnels, computational fluid dynamics and semi-empirical methods. Potential mitigation measures that can control aerodynamic noise are also reviewed.

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Section: Other Sources 81 Inter-coach Gapmentioning

confidence: 99%

Section: On-board Measurementsmentioning

confidence: 99%

See 1 more Smart Citation

Recent developments in the prediction and control of aerodynamic noise from high-speed trains

Thompson

Iglesias

Liu

et al. 2015

International Journal of Rail Transportation

118

View full text Add to dashboard Cite

show abstract

“…the inter-coach spacing, where cavity flow and acoustic resonances (Fremion et al, 2000) may occur. The specific configuration on these places is shown in Fig.…”

Section: Probes Configurationmentioning

confidence: 99%

Numerical Simulation of Aerodynamic Noise Generated by High Speed Trains

Sun

Song

2012

Engineering Applications of Computational Fluid Mechanics

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Aerodynamic noise becomes more and more significant and sometimes could be predominant as the running speed of high speed trains increases. As a result, aerodynamic noise has to be taken into consideration during the design of high speed trains. In present work, the research on aerodynamic noise of the high speed train with a speed of 300 km/h has been performed. The nonlinear acoustics solver (NLAS) approach is adopted to study the aerodynamic noise in the near field of the high speed train. With the use of an acoustic surface, the research on the aerodynamic noise in the far field has been carried out by solving the Ffowcs-Williams/Hawking (FW-H) equation. At first the method validation is performed through a two-dimensional backward step case, which shows excellent agreement with experimental results. The characteristics of the flow field dominate the generation of aerodynamic noise, therefore the flow field is firstly analyzed, including the head, the rear, and the inter-coach spacing of the train. By use of probes in specific regions on the surface of the train, the contribution of different parts of the train to the aerodynamic noise is discussed. Meanwhile, the far field feature of aerodynamic noise is also studied by placing probes in the far field. Based on the above analysis, the aerodynamic noise performance of the specific high speed train is assessed.

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“…Numerical simulation and experimental studies are the classical methods for aerodynamic noise research of high speed trains. Frid and Fremion studied the local aerodynamic noise control method of high speed train by using low-noise wind tunnel [2,3] . Sun simulated the pressure fluctuation distributed outside the car, and analysed acoustic field of the external car theoretical [4] .…”

mentioning

confidence: 99%

Research on the Reduction of the Aerodynamic Drag and Noise of EMU6 Air Conditioner

Li¹,

Yang²,

Zhou³

2017

dtetr

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With 1/8 th Scale of the Electric Multiple Units (EMU) 6 as model, the effects of air conditioner height and guiding angle on the aero-acoustic performance of EMU6 are studied, based on the 3D incompressible Lilly LES+FW-H method. The results show that the aerodynamic drag and noise of EMU6 are smaller when the air conditioner height is 190mm and the diversion angle is 30 degrees. The intensity of the dipole sound source near the air conditioner is larger. The A-weighted sound pressure level reaches the maximum at the frequency slightly lower than 1000Hz. The frequency band for the aerodynamic noise is wide, and the acoustic energy concentrates at the frequency around 1000Hz and decays with the increase and decrease of frequency. The sound pressure level is high at the streamline of the head coach and decreases gradually with the increase of distance from the tail coach.

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Aerodynamic Noise Radiated by the Intercoach Spacing and the Bogie of a High-Speed Train

Cited by 41 publications

References 2 publications

Recent developments in the prediction and control of aerodynamic noise from high-speed trains

Recent developments in the prediction and control of aerodynamic noise from high-speed trains

Numerical Simulation of Aerodynamic Noise Generated by High Speed Trains

Research on the Reduction of the Aerodynamic Drag and Noise of EMU6 Air Conditioner

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