Abstract
Ground transportation means and aircrafts with high-speed running are composed of many rod components. Aerodynamic noise generated therefrom is very outstanding. Reduction of the aerodynamic noise of rods becomes a hot topic in recent years. Most reported studies are tentative researches on aerodynamic noise of a pantograph or involve noise reduction of the pantograph with using porous materials or reshaping rod surfaces. Through using porous materials and reshaping rod surface, the aerodynamic noise of pantograph can be reduced to a certain extent, but the aerodynamic resistance will be increased and it is not convenient for practical application in engineering. Regarding this situation, the paper explores noise reduction performance of a feather on the back of a carrier pigeon and conducts the bionic design on rod surface. Through numerical simulation, the paper researches noise reduction performance of the bionic structure on the rod surface, reveals the mechanism of bionic noise reduction, and explores noise reduction effects of bionic structural rods on pantographs of the high-speed trains.
Highlights
With the continuous increase of running speed, noise problems of high-speed trains become more and more obvious
Eddies on the upper side and lower side of the asymmetric cross-section rod are divided into two strands of eddies with opposite rotation directions in the wake flow area
Eddy shedding similar to Karman Vortex Street can be observed in wake flow fields of the pantograph. This is because there are many pantograph components; due to eddy interactions generated by each component in the flow field, a complicated wake flow structure was formed
Summary
With the continuous increase of running speed, noise problems of high-speed trains become more and more obvious. Sueki [14] used a porous material on the PS207 pantograph of a Shinkansen high-speed train and conducted a wind tunnel experiment, finding that noise was reduced by 1.9 dBA when the pantograph ran at 360 km/h. This result indicates that material attributes have great influences on the aerodynamic noise of the pantograph. Noise reduction effects of the low-noise pantograph head shape and novel pantograph were verified in the wind tunnel experiment. The paper researches the noise reduction performance of the bionic structure on the rod surface, reveals the mechanism of bionic noise reduction, and explores noise reduction effects of bionic structural rods on the pantograph of the high-speed train
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