Vehicle-track coupling dynamic model correction method

Abstract

The invention provides a vehicle-track coupling dynamic model correction method. The method comprises the following steps: establishing a vehicle-track coupling space dynamics model, and applying irregularity excitation to the model; establishing a multi-objective function for model correction according to the selected optimization objective and the field actual measurement result; performing sensitivity analysis, selecting a plurality of material parameters of the model, inputting the material parameters into the kinetic model, calculating a multi-objective function, and selecting out the material parameters which have great influence on the multi-objective function; and correcting the model according to the selected material parameters, and performing dynamic simulation research on the vehicle-rail coupling system by using the corrected model. According to the method, the dynamic response can be selected as a correction target based on the field test result, the simulation model is corrected by adopting the sensitivity analysis and model correction technology, the accuracy of the simulation result can be obviously improved, and precise simulation of the dynamic response of the vehicle-track coupling system is achieved.

Description

technical field [0001] The invention relates to the field of track engineering technology and model correction, in particular to a vehicle-track coupling dynamics model correction method. Background technique [0002] Rail transit has developed rapidly in my country in recent years. The operating mileage of high-speed rail and subway has continued to increase, and the axle load of heavy-haul railways has continued to increase. Correspondingly, the track structure problems caused by rapid development have also attracted more and more attention from relevant scholars and operating departments. . [0003] Considering the safety of rail transit operation, it is difficult to implement the dynamic test of the track structure at present, and the test method is cumbersome and complicated. Therefore, the simulation model is often used to analyze the dynamic response analysis and vibration mechanism of the vehicle-rail coupling system. However, There are certain defects in the value s...

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Problems solved by technology

[0003] Considering the safety of rail transit operation, it is difficult to implement the dynamic test of the track structure at present, and the test method is cumbersome and complicated. Therefore, the simulation model is often used to analyze the dynamic response analysis and vibration mechanism of the vehicle-rail coupling system. However, There are certain defects in the value selection of material parameters in the modeling process. For example, the stiffness and damping of the suspension system and fasteners are mostly laboratory static test results, which are quite different from the dynamic stiffness and damping in actual operation; and the track plate and base plate They are all reinforced concrete materials, and their material density, elastic modulus and other parameters are highly discrete, and the parameters selected during modeling are mostly theoretical values ​​or empirical values, which makes the actual material parameters deviate greatly from the values ​​in the model

In the end, it will directly lead to deviations between the simulation results and the on-site measured results, resulting in low accuracy of the simulation results and certain problems in the credibility of the relevant research results based on it.

[0004] In general, there are certain defects in the determination of material parameters of the existing vehicle-track coupled dynamic model, especially some key parameters rely on experience, theory or laboratory static tests

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