A Moving Element Method for Analyzing Vehicle-rail Coupled Vibration of Ballastless Track in High-Speed ​​Railway

Abstract

The invention discloses a new mobile unit method for analyzing the coupled vibration of the ballastless track of the high-speed railway, and establishes the vibration equation of the three-layer Timoshenko beam considering the discrete track cushion block, and performs the control equation by introducing the moving coordinates moving with the vehicle transform, and use the Galerkin method to establish the mass, stiffness and damping matrix of the track; use the nonlinear Hertz model to couple the track MEM unit and the 10-degree-of-freedom vehicle multi-body dynamics model, and finally use the Newton-Raphson iterative method and the Newmark integral method solve. By calculating the dynamic response of the track under moving loads, the actual use or damage of the track under different operating environments can be obtained, and relative design or renovation can be carried out to increase the service life, improve operation safety, and reduce use costs. Compared with other analysis methods, the calculation efficiency can be greatly improved, and it is more realistic, accurate and effective.

Description

technical field [0001] The invention belongs to the technical field of ballastless tracks, and in particular relates to a mobile unit method for analyzing vehicle-rail coupling vibration of ballastless tracks of high-speed railways. Background technique [0002] Ballastless track is a track structure type composed of concrete and asphalt mortar instead of discrete particle ballast bed. Referring to Figure 1, it includes track 1, track pad 2, reinforced concrete track slab 3, cement Asphalt mortar layer 4, concrete foundation 5 and roadbed 6. Ballastless track has the characteristics of high track stability, good rigidity uniformity, strong structural durability and less maintenance workload. Compared with traditional ballasted track, it has better adaptability and has become the mainstream high-speed train track in my country. structure type. With the continuous increase of train speed, in order to continuously improve the safety and comfort of train operation and prolong t...

AI Technical Summary

Problems solved by technology

However, according to the literature, when researchers use MEM to simulate the vibration of the train-rail system, there are three shortcomings: (1) the Euler-Bernoulli beam model is often used for the track, and the calculation theory is insufficient; (2) the influence of the discrete support of the track is ignored , the calculation model is insufficient; (3) Most of them use the close-fit model or linear contact model to deal with the wheel-rail coupling problem

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