scholarly journals Aerodynamic noise reduction of a gangway in a high-speed train

2013 ◽  
Author(s):  
Hee-Min Noh ◽  
Hyo-In Koh ◽  
Seog-won Kim ◽  
Seung-Ho Chang
Keyword(s):  
Noise Reduction ◽  
High Speed ◽  
Aerodynamic Noise ◽  
High Speed Train

scholarly journals Research on Aerodynamic Noise Reduction for High-Speed Trains

2016 ◽  
Vol 2016 ◽  
pp. 1-21 ◽  
Author(s):  
Yadong Zhang ◽  
Jiye Zhang ◽  
Tian Li ◽  
Liang Zhang ◽  
Weihua Zhang
Keyword(s):  
Noise Reduction ◽  
High Speed ◽  
Low Noise ◽  
Broadband Noise ◽  
Full Scale ◽  
Noise Model ◽  
Aerodynamic Noise ◽  
High Speed Train ◽  
Detached Eddy Simulation ◽  
Noise Sources

A broadband noise source model based on Lighthill’s acoustic theory was used to perform numerical simulations of the aerodynamic noise sources for a high-speed train. The near-field unsteady flow around a high-speed train was analysed based on a delayed detached-eddy simulation (DDES) using the finite volume method with high-order difference schemes. The far-field aerodynamic noise from a high-speed train was predicted using a computational fluid dynamics (CFD)/Ffowcs Williams-Hawkings (FW-H) acoustic analogy. An analysis of noise reduction methods based on the main noise sources was performed. An aerodynamic noise model for a full-scale high-speed train, including three coaches with six bogies, two inter-coach spacings, two windscreen wipers, and two pantographs, was established. Several low-noise design improvements for the high-speed train were identified, based primarily on the main noise sources; these improvements included the choice of the knuckle-downstream or knuckle-upstream pantograph orientation as well as different pantograph fairing structures, pantograph fairing installation positions, pantograph lifting configurations, inter-coach spacings, and bogie skirt boards. Based on the analysis, we designed a low-noise structure for a full-scale high-speed train with an average sound pressure level (SPL) 3.2 dB(A) lower than that of the original train. Thus, the noise reduction design goal was achieved. In addition, the accuracy of the aerodynamic noise calculation method was demonstrated via experimental wind tunnel tests.

The Application of Numerical Simulation Technology in the External Aerodynamic Noise Field of High-Speed Train

2011 ◽  
Vol 101-102 ◽  
pp. 197-201 ◽  
Author(s):  
Zhen Gyu Zheng ◽  
Ren Xian Li
Keyword(s):  
Numerical Simulation ◽  
Boundary Condition ◽  
High Speed ◽  
Aerodynamic Noise ◽  
Dipole Source ◽  
Center Line ◽  
High Speed Train ◽  
Noise Field ◽  
Computational Fluid Dynamics Cfd ◽  
Flow Pressure

This paper utilized the Boundary Element Method (BEM) combined with the Computational Fluid Dynamics (CFD) based on Lighthill’s analogy in the high-speed train model, and converted the fluctuating flow pressure near the vehicle’s surface into the dipole source boundary condition in acoustics grid, eventually succeeded in completing the numerical simulation of aerodynamic noise field outside the high-speed train by introducing the dipole source boundary condition into the train BEM model. The results show that the main aerodynamic noise controlling area is 15-20 meters away from the track center line in the horizontal direction, and the Sound Press Level (SPL) is 63-72dB.

108 Effect of Aerodynamic Noise Reduction on High-speed Pantograph with Porous Metal

2008 ◽  
Vol 2008.18 (0) ◽  
pp. 55-58
Author(s):  
Takeshi SUEKI ◽  
Mitsuru IKEDA ◽  
Takehisa TAKAISHI ◽  
Takeshi KURITA ◽  
Haruo YAMADA
Keyword(s):  
Noise Reduction ◽  
High Speed ◽  
Porous Metal ◽  
Aerodynamic Noise

A25 Sound characteristic of aerodynamic noise generated from pantograph on a high-speed train

2008 ◽  
Vol 2008.61 (0) ◽  
pp. 19-20
Author(s):  
Yuki IJICHI ◽  
Daiki UENO ◽  
Taizo MORINO ◽  
Nobuaki KONDOH ◽  
Toshiyuki AOKI
Keyword(s):  
High Speed ◽  
Aerodynamic Noise ◽  
High Speed Train
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