Identification and Suppression of Noise Sources Around High Speed Trains

Abstract

Aerodynamic noise would become a significant limiting factor as the running speed of high speed trains increases, and should be taken into consideration during the design of high speed trains. In the present work, the Nonlinear Acoustics Solver (NLAS) has been adopted to investigate the aerodynamic noise of high speed trains. The region around the streamlined head of the leading car and the trailing car, the bogie region, the upstream zone and the wake zone are discussed and the distribution characteristics of aerodynamic noise sources around a high speed train is exhibited. The acoustic characteristics of the streamlined head could be contaminated due to the unreasonable arrangement of cab windows or cowcatchers. As a result, different designs of cab windows and cowcatchers are investigated in this paper and advice on low noise design is given. Based on the above analysis, a new design of the streamlined head is proposed. Numerical results reveal that the noise level of the new streamline has been greatly suppressed. The analysis would aid in identification of noise sources around high speed trains and design of high speed trains with low noise.

Research on Aerodynamic Noise Reduction for High-Speed Trains

“…A low-noise structure for the CRH3 train was designed using both a nonlinear acoustic solver and the FW-H equation by Sun et al [19]. Their results showed that the use of smooth transitions for head windows and streamline positions and the use of a streamlined design for the head cowcatcher could reduce the near-field noise by 7 dB(A) and 14 dB(A), respectively, compared with the original model.…”

Surrogate Based Optimization of Aerodynamic Noise for Streamlined Shape of High Speed Trains

“…Sueki proposed a new aerodynamic noise reduction method that involves covering the surface of objects with a particular porous material [10]. Sun investigated on different designs of cab windows and cowcatchers and gave a reasonable advice on low noise design of the streamlined shape [6]. It can be seen that much effort has been put to the design of low-noise pantograph, which engineering experience is mostly dependent on for noise reduction.…”

“…Until now, the study on aerodynamic noise mechanism has gradually matured. On the other hand, many studies focus on noise reduction of specific components to meet practical usage [6][7][8][9][10]. In order to obtain low noise pantograph, Ikada proposes a precise rail pantograph design method that provides both aerodynamic and aero-acoustic sound designs more quickly and economically [7,8].…”

“…Talotte presents a critical survey of the identification and modeling of railway noise sources and summarizes the current knowledge of the physical source phenomena [2,3]. Sun numerically analyzes the main noise sources of high-speed trains, quantitatively compares the different noise sources and identifies the main noise sources, such as the leading streamline, the inter-coach spacing, the bogie zone and the wake zone as well [4,6]. Noger performed an investigation on acoustic production mechanisms in the TGV (which is short from the French words "train à grande vitesse") pantograph recess to be able to reduce the radiated noise [5].…”

“…Current study on aerodynamic noise of high-speed trains mainly focuses on two aspects: On the one hand, identification of noise sources of high-speed trains and mechanism analysis [2][3][4][5][6] were performed, aiming at obtaining more precise acoustic structures of high-speed trains. Talotte presents a critical survey of the identification and modeling of railway noise sources and summarizes the current knowledge of the physical source phenomena [2,3].…”