Unsteady Aerodynamics of High Speed Train Pantograph Cavity Flow Control for Noise Reduction

2016 ◽  
Author(s):  
Hogun Kim
Keyword(s):  
Flow Control ◽  
Noise Reduction ◽  
High Speed ◽  
Unsteady Aerodynamics ◽  
Cavity Flow ◽  
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.

Complex structured polymer concrete sleeper for rolling noise reduction of high-speed train system

2019 ◽  
Vol 223 ◽  
pp. 110944 ◽  
Author(s):  
Sangkeun Ahn ◽  
Semin Kwon ◽  
Yeon-Taek Hwang ◽  
Hyo-In Koh ◽  
Hak-Sung Kim ◽  
...  
Keyword(s):  
Noise Reduction ◽  
High Speed ◽  
Polymer Concrete ◽  
High Speed Train ◽  
Rolling Noise ◽  
Train System
Sign in / Sign up

Export Citation Format

Share Document