Research On Control Strategy And Analysis Method For Dynamics Problems Of High Speed Railway Bridge

High-speed railway is a systematic engineering which refers to a wide range of professions and high technique. With the development of our country's economy and the pursuing of a society which saves energy sources, high-speed railway springs up. At present, the design of bridge structure adopts the static method which cannot reflect the dynamic interaction among the vehicle, railway and bridge. Moreover, the bridge deformation and the rail irregularity are restricted strictly by high-speed railway. As a result, it's of great importance to theorize the dynamical design of high-speed railway which considers the interaction among the vehicle, the railway and the bridge. Then effective control method can be used to minimize the dynamical reflection of the bridge. In this paper, based on the achievements in the previous works, we pay our attention on the dynamic analysis of high-speed railway bridge and its control strategy. The main work and our achievements are as follows:1,The main dynamic problem of high-speed railway bridge is the interaction of the vehicle, the railway and the bridge, which belongs to systematic dynamics. This paper introduces the coupling dynamic theory of vehicle and bridge and the standard assessment of bridge's dynamic performance. Then the dynamic model and equation of the vehicle, the railway and the bridge is given in the paper. Moreover, the paper indicates that the widely-used coupling dynamic theory is difficult to be used in the vibration control of high-speed railway bridge for the reason that too much degree of freedom of the vehicle is considered.2,Combined with the high frequency vibration of the rail, we simplify the vehicle model. And by the consideration of the necessity of the suppression or isolation of high-speed railway bridge's vibration, we strengthen the relation between the bridge and the rail. Then a new dynamic model is built, and a new vehicle-rail-bridge element is formulized. By the application of the new element, the coupling vibration problem of vehicle-rail-bridge is changed into the ordinary bridge's dynamic finite-element analysis. And then we use the MATLAB language to generate the dynamic analysis program of high-speed railway bridge. Through the program we analyze the 32m-span standard beam of high-speed railway bridge, study the effect of vehicle velocity, the damping of rail bearing and rail's irregularity on the bridge's dynamic performance.3,The paper introduces the power spectrum density function(PSD) and its numerical simulation method of the rail irregularity of high-speed railway in different countries which is the premise of the coupling vibration analysis of vehicle-rail-bridge.4,Bridge on high-speed railway has a strict limitation on the camber by creep deformation. This paper use the GM(1,1) model in grey theory to forecast the creep coefficient and creep camber of concrete beams. And it indicates that on the bases of the precise forecasting of the creep camber, we can put the creep camber into the irregularity of the rail to proceed the dynamic analysis and assessment of long-span prestressed concrete bridge on high-speed railway, which can help to build longer span bridges on high-speed railway.5,The vibration system of high-speed railway bridge is in fact a coupling tandem connection system. And we must use the extensive system control attitude to present our vibration control method in theory. This paper introduces the numerical model of structure's control theory. Based on the theory, The paper discusses TMD and MTMD vibration-control, studies the multiple resonance vibration of vehicle-bridge and its control strategy. Moreover, the paper introduces the neural network control method and its executing procedure of intelligence control theory, which may be used in bridge's vibration control. At last, the paper generalizes that the integral vibration control is the most effective control strategy in high-speed railway bridge. Then the technique direction and control strategy of high-speed railway bridge's vibration control come into being.