The Research Of Random Dynamic Response And Control Of Coupled Vehicle-bridge System

The results of the research on the dynamical responses and control tactics of coupledvehicle-bridge system from predecessors are summed up in this thesis at first. Then some numericalmethods, models of random road roughness, and coupled vehicle-bridge system involved in the thesisare presented briefly. Based on the random vibration theory, the main contributions of this thesis areas follow:Firstly, based on the random vibration theory, the random response problems of a coupledvehicle-bridge system are analyzed in this paper, while the vehicle has a constant acceleration, and therandom road roughness of the bridge was taken into account as a random excitation of the coupledsystem. In this research, the coupled vehicle-bridge system was consisted of a quarter vehicle modeland a simple beam model respectively. For the location of a vehicle on a bridge is continuouslychanging during the process of the vehicle across the bridge, so the random responses of the coupledsystem can be reduced to the response problem of a time-varied linear system subjected to aevolutionary random excitation. Hence, the time-domain method of the evolutionary random responseproblems can be applied to gain the numerical solution of the problem. The mean square response ofthe coupled vehicle-bridge system, and several discuss are all presented in here.Secondly, based on the analysis method and results of the first step, two common control tactics,namely, the Linear Quadratic Gaussian stochastic optimal control (LQG), which is a active controlmethod, and the Multiple Tuned Mass Damper control (MTMD), which is a passive control method,are all imposed to coupled vehicle-bridge system. The numerical results presented in this paper showthat both of the two methods can reduce the dynamic responses of the coupled vehicle-bridge systemeffectively.