Identification and analysis of aerodynamic noise sources in the bogie area of high-speed trains
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.
万方数据
维普
