Research On Vibration Response And Vibration Control Of Vehicle-bridge Coupling System

Transportation is the lifeblood of national economy,and bridge plays an important role in transportation.The vehicle quantity,vehicle speed and vehicle freight volume on the bridge is increasing year by year.Increasing the forced vibration effect of vehicle on the bridge,the structural performance and service life of the bridge is seriously affected.The vibration of the bridge will cause smoothness,comfort and safety of the vehicle and passengers.The vibration control of the vehicle bridge coupling system is an important study.The study of this paper is as follows:(1)Simplifying moving the vehicle into moving force load,derives the dynamic response equation of simple supported beam under moving force load,considers the conditions of resonance and attenuation phenomenon in a undamped beam,and calculates the dynamic impact factor of the bridge.The program for analyzing the dynamic response of the bridge is compiled with MATLAB software,the conditions of resonance and attenuation phenomenon the damped or undamped beam is considered,the relationship between the dynamic impact factor and the number of vehicle,the speed parameter,the distance parameter and number of vehicle is used to simulate the dynamic response of the bridge,and verify the correctness of the self-programming program by comparing with exiting literatures.(2)This chapter studies the dynamic analysis of the bridge under the action of a quarter and a half of the vehicle subsystem,derives the dynamic equations of the vehicle subsystem and the bridge beam subsystem,obtains the dynamic equations of the vehicle-bridge coupling system,analyzes and compares the dynamic response of the vehicle bridge coupling system under the influence of the vehicle speed,vehicle spacing,vehicle number and other factors.In a certain range,the dynamic response of bridge is increasing with the increase of vehicle speed,the increase of vehicle number and the decrease of vehicle spacing.When it reaches a certain value,the dynamic response of the bridge basically remains constant;the dynamic response of the vehicle body is the most sensitive to the road roughness.With the vehicle speed is increasing,the road roughness rank is lower,and evaluation index of vibration comfort and root mean square value of the vehicle body is overall the trend becongming smaller,the evaluation index of vibration comfort is becoming better.(3)This chapter studies dynamic response and vibration control of train railway bridge coupling system,derives modeled CRH380 BL high-speed railway train,obtains the dynamic equations of train-railway bridge.Comparative analysis of the dynamic response factors of the following vehicle-railway bridge in the case of vehicle speed,bridge span and track irregularity.The results show that the vehicle speed increases,bridge span increases,the dynamic response of bridge midspan increases.A tuned mass damper(TMD)is installed on the bridge midspan.It is obtained that TMD plays a role in damping the dynamic response of the bridge midspan,reduces vehicle body vibration acceleration,improves the ride comfort of the vehicle body.(4)This chapter studies Hutong rail-cum-road cable-stayed bridge as engineering background,studies on dynamic response and active control of the train long-span cable-stayed bridge.Comparative analysis of the dynamic response of the long-span cable-stayed bridge at defferent vehicle speeds.According to the bridge active control theory,the active control method is used to reduce the vibration of the long-span cable-stayed bridge and train coupling system.It is concluded that the dynamic response of the vehicle-bridge can be significantly reduced by the actuator under the active control.In order to meet the control force and frequency requirements,the hydraulic actuator with large output force and low output frequency can achieve the effect of controlling the dynamic response of the coupling system.As the state vector weighting matrix Q increases,the output control force by the actuator increases,which has a better control effect on the dynamic response of the vehiclebridge coupling system.With the increase of the modal control vector R,the output control force of the actuator decreases,the dynamic response of the bridge and vehicle becomes worse.