Vehicle-speed Hump-floor Coupled Vibravation Effect And Mechanism Of Vibration Reduction

Comfort of long-span floor is widespread concerned in structural designstage. Generally, checking floor comfort has always focused on pedestrian loadand equipment load, but rarely considering the influences of floor vibrationwhich the vehicle load has caused. When the vehicle goes through the speedhumps, it will have a larger impact on the floor, and the real response of floorvibration will reflect coupling effects among vehicle, deceleration devices, andstructure.This article has established integration model of vehicle-speed humps-structure which can reflect coupling effects among vehicle, deceleration devices,and structure, focusing on the floor vibration induced by the vehicle goingthrough the speed humps. This article has simulated the process of the vehiclegoing through the speed humps and discussed the influences of structuralresponse which coupling effects between vehicle and structural caused.For avoiding resonance between vehicle and structural, this article hasresearched the influences of structural parameters, vehicle parameters, andparameters of speed humps has caused to vehicle load, based on the integrationmodel of vehicle-speed humps-structure. On the base of vehicle loadcharacteristic in time domain, this article has researched the vehicle loadcharacteristic in frequency domain, and given the frequency distribution range ofvehicle load. Integrating the analysis of vehicle load in time domain andfrequency domain, this article has provided design basis of floor comfortcalculation considering vehicle load.To the question of excessive floor vibration, this article has presented adeceleration device which can reduce the floor vibration induced by vehicle load,and proceeded parametric analysis of deceleration device. This article hasverified the effects of vibration reduction based on the integration model ofvehicle-speed humps-structure and by comparing the acceleration of structuralwhen the vehicle goes through the speed humps and the deceleration device.