Analysis of Aerodynamic Noise Characteristics of High-Speed Train Pantograph with Different Installation Bases

Abstract

The high-speed-train pantograph is a complex structure that consists of different rod-shaped and rectangular surfaces. Flow phenomena around the pantograph are complicated and can cause a large proportion of aerodynamic noise, which is one of the main aerodynamic noise sources of a high-speed train. Therefore, better understanding of aerodynamic noise characteristics is needed. In this study, the large eddy simulation (LES) coupled with the acoustic finite element method (FEM) is applied to analyze aerodynamic noise characteristics of a high-speed train with a pantograph installed on different configurations of the roof base, i.e. flush and sunken surfaces. Numerical results are presented in terms of acoustic pressure spectra and distributions of aerodynamic noise in near-field and far-field regions under up- and down-pantograph as well as flushed and sunken pantograph base conditions. The results show that the pantograph with the sunken base configuration provides better aerodynamic noise performances when compared to that with the flush base configuration. The noise induced by the down-pantograph is higher than that by the up-pantograph under the same condition under the pantograph shape and opening direction selected in this paper. The results also indicate that, in general, the directivity of the noise induced by the down-pantograph with sunken base configuration is slighter than that with the flush configuration. However, for the up-pantograph, the directivity is close to each other in Y-Z or X-Z plane whether it is under flush or sunken roof base condition. However, the sunken installation is still conducive to the noise environment on both sides of the track.

Numerical Investigation on the Aerodynamic Noise Generated by a Simplified Double-Strip Pantograph

“…According to the solution setup mentioned above, the aerodynamic noise generated by a cylinder with a diameter of 10 mm at inflow velocity of 72 m/s is simulated. This case is also used to verify the calculation method in other literatures on pantograph aerodynamic noise research [10,19,25]. Fig.…”

Impact of Different Nose Lengths on Flow-Field Structure around a High-Speed Train

“…In the wake of the train, there are two vortices with opposite rotation direction that continue to develop downward and outward, and the appearance of the peak value of U is related to the two wake vortices [17]. At present, a large number of scholars use the Q criterion to study the development and separation of wake structures along HSTs [34][35][36][37]. The iso-surface of the second invariant of the velocity gradient tensor Q is defined as follows [36]:…”

Numerical simulation and prediction of aerodynamic noise of high-speed trains

“…2 Excessive aerodynamic noise will reduce passenger comfort, affect the life and work quality of people along the line, especially in hospitals, schools, residential areas and other noisesensitive areas, and even damage the hearing and nervous system of people inside and outside the car. [3][4][5][6] In China, aerodynamic noise pollution is considered to be one of the largest environmental pollution factors produced by high-speed railways to the society. According to the "14th Five-Year Plan of Action for Noise Pollution Prevention and Control", the equipment selection of urban rail vehicles and the construction of rail lines and roadbed structures should comply with the requirements for the prevention and control of noise pollution in urban rail transport.…”