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With modern train speed the continuous improvement of, bridge structure in the railway lines in the three large-scale use, high - speed railway vehicle - bridge coupled vibration problems research respect of becomes increasingly important. In order to able to effectively pairs of lines in the existing bridge the running status of conduct assess, but also order to be able pairs of newly built bridges to conduct a comprehensive rational optimization design, there are necessary to pairs of trains across the bridge's bridge Coupled Vibration problems for analysis. Computer simulation is a compare efficient and economical method. And in this the process, to figure out wheel-rail between the coupling relationship is the ability to get the correct wheel-rail force, thereby get the correct and effective the numerical solution the necessary conditions. This paper uses vehicle, bridges coupling big system of thought, established a vehicle - bridge coupled Vibration Model. And according to the model the characteristics of, focusing on studied the wheel-rail contact geometric relationship, the wheel between the rails vertical, lateral interaction force. Gives the vertical Hertz nonlinear elastic contact forces and transverse Kalker creep-slip the theory of derivation process. Against the excitation source, this article also gives the analog Rail Irregularity the methods and program flow chart, and according to PSD Figure, to simulate the orbit's random irregularity. For the bridge models, this article according to dynamic finite element approach, a detailed derivation a unit mechanical characteristics of matrix, and on this basis, the establishment of a bridge analysis model. Of this paper main contents of are as follows: 1, the establishment a relatively complete locomotive vehicle power analysis model, in order to two Department of Hanging passenger cars as the main object of analysis, will carbody, bogie, wheel pairs of simplified as rigid body, the establishment of by the 31 degrees of freedom composed of 's spatial vibration of analysis model. Namely bodywork and bogie considered separately traverse, ups and downs, side-roll, nodding, shaking his head five degrees of freedom; wheel pairs of to consider traverse, ups and downs, side-roll, nod four degrees of freedom; by the Hamilton principle, got dynamic finite element method, deduced 12 degrees of freedom space for beam element mechanical characteristic matrix of, and take advantage The unit is to establish a bridges dynamic analysis model. 2, given in detail wheel-rail contact geometric relationship, gives the wheel-rail contact geometric relationship involved in the to the the various contact parameters, contact state; gives the for solving wheel-rail contact point of's several treatments method, namely for special wheel-rail type surface's analytical method, against the arbitrary shape's spatial search Iterative Approximation of Legalist and the trace line search Legalist, this article In the specific implementation process, the pairs of iterative method carried out has been improved, right criterion conditions of carried out has been improved, to make it more line with the actual conditions for. Finally is given under specific conditions, wheel-rail geometric contact parameters inter-relationship between the diagram. 3, based on elastic mechanics, contact mechanics theory, the This article gives wheel-rail vertical contact force the derivation of, got wheel-rail vertical force formula, the wheel-rail contact ellipse plaques the length of the axis of calculation formula. According to Kalker Linear vermicular slippery assumption, gives the creep force's formula derivation. Four, according to the wheel-rail contact the coordination of conditions for, established a by the vehicle subsystem and bridges subsystems composed of a large system model, by the numerical integration Method for Solving vehicle - bridge coupled large-scale systems, got vehicle and bridges the dynamic response of results of; against the orbit irregularity, detailed introduction of the track irregularity the classification, track irregularity produce the reasons for, domestic and foreign common's power spectra, and a detailed gives the cycle diagram method, self-compiled procedures, given the the United States track spectrum the simulation results of ; in the solution process, gives the several common step by step integration numerical methods, the preparation of related procedures, as a solving the Bridge Coupled Interaction System solver.
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