Journal of Jilin University(Engineering and Technology Edition) ›› 2024, Vol. 54 ›› Issue (2): 346-355.doi: 10.13229/j.cnki.jdxbgxb.20220364

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Identification and analysis of aerodynamic noise sources in the bogie area of high⁃speed trains

Yi-gang WANG1,2(),Yu-peng WANG1,2,Hao ZHANG1,2,Si-an ZHAO1,2   

  1. 1.Shanghai Automotive Wind Tunnel Center，Tongji University，Shanghai 201804，China
    2.Shanghai Key Laboratory of Vehicle Aerodynamics and Vehicle Thermal Management Systems，Shanghai 201804，China
  • Received:2022-04-05 Online:2024-02-01 Published:2024-03-29

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Abstract:

The bogie area of high-speed trains is one of main sources for aerodynamic noise. So far， it is difficult to describe the characteristics of aerodynamic noise sources of high-speed trains， there are few effective sound source identification methods. Using the characteristics of the sound source dominated by dipole sound sources in the high-speed train bogie area， the aerodynamic sound source is equivalent to a collection of countless spherical sound sources. Based on the relationship between sound radiation and sound source， sound source and flow field physical quantities according to the relationship， combined with the fluid numerical simulation， a method for identifying the sound source of the high-speed train dipole was established， and the sound source was identified by focusing on the bogie area of the lead car. At the same time， based on the vortex sound theory， the relationship between the intensity of the dipole sound source and the multi-physics of the flow field was established， and the essence of the sound source generated by the flow field was analyzed. The research shows that the concentrated position of the dipole sound source is mostly the position where the windward side airflow and the wall surface strongly interact， and the collision and separation of the airflow and the wall surface are the main reasons for the generation of the dipole sound source， and the change of vorticity in this area is dual. The intensity of the polar sound source has the greatest influence， and in different regions， the vorticity components in different directions play a leading role.

Key words: vehicle engineering, high-speed train, bogie, dipole sound source, numerical simulation, vortex sound equation

CLC Number: 

  • V221.3

Fig.1

Vibration sphere source space coordinate system"

Fig.2

Sound source surface particle velocity decomposition"

Fig.3

High-speed train model and computational domain"

Fig.4

High-speed train model size"

Fig.5

High-speed train model and measuring points"

Fig.6

Microphone measuring point arrangement"

Fig.7

Comparison of sound pressure level between test point 2 experiment and simulation 1/3 octave frequency"

Fig.8

Comparison of sound pressure level between test point 3 experiment and simulation 1/3 octave frequency"

Fig.9

Characteristics of dipole sound sources in the surface area of the head car"

Fig.10

Front wheel streamlines"

Fig.11

Front wheel streamline extraction"

Fig.12

Changes in the physical quantities of the flow field of the extracted streamlines"

Fig.13

Streamline at the end of the axle"

Fig.14

Streamline at the end of the axle extraction"

Fig.15

Changes in the physical quantities of the flow field of the extracted streamlines"

Fig.16

Streamlines at the leading edge of the scavenger"

Fig.17

Streamlines at the leading edge of the scavenger extraction"

Fig.18

Changes in the physical quantities of the flow field of the extracted streamlines"

Fig.19

Vorticity of the front wheel and the changes of the components in each direction"

Fig.20

Vorticity of the streamline at the end of the axle and the changes of the components in each direction"

Fig.21

Vorticity of streamline and components in each direction at the front of the barrier remover"

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