Abstract：Research purposes:Bymeans of establishing the continuous elastic resiliently supported layer beam model for track structurewith random irregularity of track verticalprofile, numericalmethod forvibration analysis ofballastless trackwith resiliently supported block ties is presented for the purpose ofdirecting the design of the ballastless track.
Research conclusions:Vibration equations for track structure should be transformed with Fourier for obtaining the vibration displacements inFourier transform domain. Then, the vibration responsesof the track structure can be obtained by performing inverse fast Fourier transform. The random irregularity of track vertical profile can be generated on computerbased on the measured power spectral density of track vertical profile. Thismethod is simple and effective compared with other complicated vehicle and track coupling dynamicsmodels. It is easy to codewithMatlab software to reflect the fundamental rules and characteristics of the track vibration, especially suitable for reflecting the track vibrationwhile train passing. Thismethod had been used to analyze the track vibration with resiliently supported block ties forhigh-speed railway, including the influences ofdifferent random irregularities of track verticalprofile, railpad and fastening rigidities, track foundation rigidities and the train speeds on track vibration. The result shows the reasonable values fordesign of rail pad and fastening rigidity and track foundation rigidity are 60~90MN/m and 120~ 150MN/m respectively.
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2009, Vol. 26 
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