Track irregularities are the main excitation source of vibration of straddle monorail vehicles.It is of great significance to study the vibration source of straddle monorail vehicles for vehicle and track beam maintenance.A dynamics model of straddle monorail vehicles was established based on SIMPACK multi-body dynamics software.Continuous wavelet transform was carried out on the time-domain signals of frame acceleration and irregularity signals,and time-frequency analysis was carried out with the continuous wavelet transform coefficient serving as the index to determine the frequency band where the energy of vehicle vibration and irregularity signals was mainly concentrated.Cross wavelet transform and wavelet coherence method were used to study the wavelet correlation of accelera-tion signals in time domain under multiple working conditions,and the average wavelet coherence value was used to evaluate the contri-bution of track beam irregularities to lateral and vertical vibration of vehicles.The results show that as for the guide surface irregularity,the transverse mean wavelet coherence peak values are 0.93,0.71 and 0.66 at 0.5 Hz,2 Hz and 14 Hz respectively,and the vertical mean wavelet coherence values fluctuate around 0.3.As for the stable surface irregularity,at 6 Hz,the transverse mean wavelet coherence peak value is 0.44,and the vertical mean wavelet coherence value fluctuates around 0.3.As for the running surface irregularity,at 6 Hz,the transverse mean wavelet coherence peak value is 0.53,and the vertical mean wavelet coherence value is stable at 0.98.As for the irregu-larity caused by overall track beam deformation,the transverse mean wavelet coherence peak value at 14 Hz is 0.41,and the vertical mean wavelet coherence peak value at 2 Hz is 0.47.
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