Effect of bogie web structure on aerodynamic noise of high-speed train
With the continuous improvement of train running speed,the problem of aerodynamic noise becomes more and more prominent.Therefore,it is necessary to effectively control the aerodynamic noise of high-speed trains.To reduce the aerodynamic noise in the bogie area of high-speed train,based on IDDES model and FW-H acoustic equation,a 1:8 scale model of bogie without web and with web was established in this paper.The change of flow field,the intensity of noise source and the magnitude of far-field radiated noise after installing webs in the bogie area at 400 km/h speed were investigated through numerical simulation.The effects of web on aerodynamic noise in vehicle and bogie area were analyzed.The results are drawn as follows.When the web is installed at the bottom of the bogie area,the flow diversion effect of the web slows down the fluid impact and fluid interaction in the bogie area,inhibits the formation of vorticity in the bogie area,and the pulsating pressure level of the front and rear wheelsets of the bogie.The frame is significantly reduced,which effectively reduces the intensity of the aerodynamic noise source in the bogie area.After the bogie web is installed,the sound pressure level of each measuring point decreases in the frequency band from 200 Hz to 1 000 Hz and above 2 000 Hz.The amplitude of the total sound pressure level of the far field radiation noise also decreases.The average total sound pressure level of the vehicle far-field radiated noise decreases by 2.33 dB(A),and the average total sound pressure level of the bogie area decreases by 4.03 dB(A).The proportion of the bogie area radiated noise energy in the vehicle radiated noise energy decreases from 53.2%to 27.8%.The noise reduction effect of one-position bogie of front car is the best,and the average total sound pressure level of radiated noise decreases by 5.88 dB(A).The web control of bogie radiated noise is mainly reflected in the control of front,rear wheelset and frame components.The research results can provide some reference for further optimization of aerodynamic noise of high-speed trains.
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