Research on Characteristics of Wheel-rail Noise at a High Speed of 400 km/h and Contribution of Wheel-rail Sound Sources
To investigate the characteristics of wheel-rail noise at a high speed of 400 km/h,a prediction model for wheel-rail rolling noise was created,utilizing the Fourier series method and 2.5D boundary element method.This model enables the analysis of acoustic radiation features concerning wheelsets and tracks.By employing the wheel-rail rolling noise prediction model,the research also delves into the noise response of wheel-rail short-wave irregularity in the cases of various wave depth and wavelength characteristics,as well as the effects of fastening parameters on wheel-rail noise.The results indicate the following findings:(1)The lateral and vertical wheel-rail forces exhibit nonlinear increases of 0.7kN and 62.7 kN respectively while the wave depth of short-wave irregularity grows;(2)Within the 31.5～500.0 mm wavelength range of short wave irregularity,less influence is generated on lateral and vertical wheel-rail forces;(3)A 1 dB increase in the wave depth of short-wave irregularity corresponds to a linear rise of about 1 dB(A)in the total sound power level of wheelsets,tracks,and the wheel-rail system;(4)As the wavelength of short-wave irregularity decreases,the sound power of wheelsets rises,while the sound power of tracks first increases and then decreases;(5)Elevating the vertical stiffness of fastenings results ina total sound power level decrease of 0.1 dB(A)for wheelsets,1.1 dB(A)for tracks,and 1.0dB(A)for the wheel-rail system;(6)Increasing the vertical loss factor of fastenings leads to a total sound power level decrease of0.7 dB(A)for wheelsets,4.4 dB(A)for tracks,and 4.1 dB(A)for the wheel-rail system;(7)The lateral stifffniess and lateral loss factor of the fastenings do not significantly impact the total sound power level of the wheel-rail system.
high speed trainwheel-rail noisecontribution of sound sourcesshort-wave irregularityfastening parameters
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