@inproceedings{4ec81aae265347468a3f981a12e5f6f5,
title = "Numerical computation of aerodynamic noise reduction by using ultra-light porous metals",
abstract = "As the speed of high-speed train (HST) increases continuously, aerodynamic noise has become more important compared with the wheel/rail noise, which affects the inhabited environment around the railway and the comfort of passengers. This paper preliminarily investigates the feasibility of reducing the low Mach number aerodynamic noise by using ultra-light porous metals. The noise generated by the flow around a two-dimensional circular cylinder which is the typical unit of pantographs, was simulated with and without a porous media. The hybrid method that combines large eddy simulation (LES) with Ffowcs Williams-Hawkings (FW-H) equation was employed. The calculated overall sound pressure level (OASPL), vortex shedding frequency and time-average drag coefficient agree well with available experimental data. Then, the effects of porosity and the speed of train on the aerodynamic noise were predicted and explained in view of fluid mechanics. The numerical results indicate that the open cell-type porous media with high porosity can modify and regularize the fluid flow, adjust the vortex shedding frequency, leading to a significant reduction of aerodynamic noise.",
keywords = "aerodynamic noise, high-speed train, noise control, porous media",
author = "Hanru Liu and Jinjia Wei",
year = "2011",
doi = "10.1061/41184(419)268",
language = "英语",
isbn = "9780784411841",
series = "ICTE 2011 - Proceedings of the 3rd International Conference on Transportation Engineering",
pages = "1624--1629",
booktitle = "ICTE 2011 - Proceedings of the 3rd International Conference on Transportation Engineering",
note = "3rd International Conference on Transportation Engineering, ICTE 2011 ; Conference date: 23-07-2011 Through 25-07-2011",
}