Intelligent control for braking-induced longitudinal vibration responses of floating-typerailway bridges

Abstract

This paper presents an intelligent control method and its engineering application in thecontrol of braking-induced longitudinal vibration of floating-type railway bridges.Equations of motion for the controlled floating-type railway bridges have been establishedbased on the analysis of the longitudinal vibration responses of floating-type railwaybridges to train braking and axle-loads of moving trains. For engineering applications of thedeveloped theory, a full-scale 500 kN smart magnetorheologic (MR) damper has beendesigned, fabricated and used to carry out experiments on the intelligent control ofbraking-induced longitudinal vibration. The procedure for using the developedintelligent method in conjunction with the full-scale 500 kN MR dampers has beenproposed and used to control the longitudinal vibration responses of the deck offloating-type railway bridges induced by train braking and axle-loads of moving trains.This procedure has been applied to the longitudinal vibration control of the TianXingzhou highway and railway cable-stayed bridge over the Yangtze River inChina. The simulated results have shown that the intelligent control system usingthe smart MR dampers can effectively control the longitudinal response of thefloating-type railway bridge under excitations of braking and axle-loads of moving trains.