Expression and Impact Analysis of Irregularity Spectrum of Longitudinal Level in Whole Wavelength Range by Integrating Rail Surface Short-wavelength Irregularity
The track irregularity spectrum is an effective tool to characterize the amplitude-frequency characteristics of track irregularity.At present,the research on the track irregularity spectrum of high-speed railway mainly focuses on the wavelength range of 2 m and above,and rarely involves the short-wavelength irregularity spectrum of rail surface.Based on a large number of measured data of ballastless track of high-speed railway,this paper studied the expression function of the short-wavelength irregularity spectrum of the rail surface and its adaptability to the connection with medium and long-wavelength track irregularity spectrum.The results show that the two-piecewise power function can well characterize the short-wavelength irregularity spectrum of the rail surface.A 5th order polynomial in the logarithmic coordinate system was proposed to fit the whole wavelength range irregularity spectrum of longitudinal level,to realize smooth transition of the medium and long-wavelength and shortwave components between the wavelengths of 1～2 m.The measured data show that under the condition of high-speed train operation,the short-wavelength longitudinal level has a significant impact on the vertical force of the wheel and rail,as well as the vertical acceleration of axle box,frame and vehicle body.The es-tablishment of the whole wavelength range irregularity spectrum has important significance for the simulation analysis of wheel-rail vibration,the design of vehicle & track structures and the evaluation of track state.
high-speed railwayshort-wavelength irregularitywhole wavelength range longitudinal levelvehicle dynamic responsepower spectral density
万方数据
维普
