Novel moving unit method for analyzing coupling vibration of ballastless track of high-speed railway

Abstract

The invention discloses a novel moving unit method for analyzing coupling vibration of a ballastless track of a high-speed railway. The method comprises the following steps: establishing a three-layerTimoshenko beam vibration equation considering discrete track cushion blocks, transforming a control equation by introducing moving coordinates moving along with a vehicle, and establishing a mass, rigidity and damping matrix of a track by adopting a Galerkin method; adopting a nonlinear Hertz model to couple an orbit MEM unit and a 10-degree-of-freedom vehicle multi-body dynamic model, and finally, adopting a Newton-Raphson iteration method and a Newmark integral method to solve. By calculating the dynamic response of the track under the moving load, the actual use conditions or damage conditions of the track under different use environments are obtained, and relative design or renovation is performed, so that the service life is prolonged, the operation safety is improved, and the use cost is reduced. Compared with other analysis methods, the method can greatly improve the calculation efficiency, is more realistic, and is accurate and effective.

Description

technical field [0001] The invention belongs to the technical field of ballastless track, and in particular relates to a novel mobile unit method for analyzing vehicle-rail coupling vibration of ballastless track of high-speed railway. Background technique [0002] Ballastless track is a track structure type composed of concrete and asphalt mortar instead of discrete particle ballast bed, refer to figure 1 , including track 1, track pad 2, reinforced concrete track slab 3, cement asphalt mortar layer 4, concrete foundation 5 and roadbed 6 arranged in sequence from top to bottom. 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 co...

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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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