Abstract
Based on the pseudo excitation method and the uniform excitation input model of road roughness, the 3D vehicle-bridge coupling non-stationary random vibration model of vehicle variable speed driving is established. The effects of vehicle initial velocity and acceleration on the vertical displacement, root mean square value of acceleration and spectrum characteristics of bridge mid-span are studied. Based on the road roughness power spectrum suggested by national standard GB7031, the pseudo excitation method is used to construct a 3D vehicle-bridge coupling random vibration model to study the influence of the spatial effect of the spectrum input excitation on vehicle-bridge coupling vibration, vehicle vibration and the spectrum characteristics of vehicle-bridge system.
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