High-speed train braking system heat-engine coupling tribological behavior prediction method

Abstract

The invention relates to a high-speed train braking system heat-engine coupling tribological behavior prediction method, which comprises the following steps: S1, carrying out braking system heat-engine coupling response state analysis in a formal service stage, and calculating the heat-engine coupling response of a braking system; s2, predicting a heat engine coupling friction wear behavior in a formal service stage, updating the finite element model in real time, and recording and storing all results when a cut-off condition is reached; and S3, carrying out vibration noise behavior prediction on the finite element model with the changed geometric morphology. The method fully considers the influence of the temperature on the friction wear performance of the material, makes up for the defect that the temperature influence is neglected during wear prediction in the existing prediction method, considers the influence of the friction surface topography change on the friction vibration noise, improves the accuracy and effectiveness of the prediction result of the heat-engine coupling tribological behavior of the braking system, and improves the prediction accuracy of the heat-engine coupling tribological behavior of the braking system. An effective means is provided for predicting the service state and the service life of key parts of a braking system, and the operation and maintenance cost of a high-speed train is reduced.

Description

technical field [0001] The invention belongs to the technical field of friction braking, in particular to a method for predicting the thermal-mechanical coupling tribological behavior of a high-speed train braking system. Background technique [0002] With the rapid development of the national economy, the running speed of high-speed trains is increasing day by day, which requires higher and higher requirements for the braking system; high-speed trains usually use a disc brake system, and multiple shaft-mounted brake discs are installed on the axle Or install a wheel-mounted brake disc on the side of the wheel web, use a brake caliper to press the brake pads tightly against the surface of the brake disc, and generate braking torque through friction to complete the train braking; this braking method is the same as the original tread Compared with braking, because the braking force does not act on the wheel tread, the thermal load and wear of the wheel tread can be greatly red...

AI Technical Summary

Problems solved by technology

However, most of the existing simulation predictions on the thermal-mechanical coupling tribological behavior of high-speed train braking systems focus on the analysis of one kind of tribological behavior and its influencing factors, while the disc interface temperature and friction block wear are considered comprehensively during the braking process. It is extremely rare to conduct an in-depth analysis of the thermal-mechanical coupling tribological behavior of the brake system under the evolution law and mutual influence of behavior, disc contact state, friction vibration and noise, etc.

For example, when studying the friction and wear degradation behavior of brake pads of high-speed trains, it is often assumed that the wear rate is a constant value, and the influence of temperature on the wear behavior of friction pads during the braking process is ignored, which makes it difficult to analyze the wear behavior of friction pads. For another example, the existing research on the friction vibration noise of the brake system usually assumes that the brake friction interface is intact and fails to take the influence of interface wear into account

However, since interface friction and wear will lead to continuous changes in the contact interface morphology and introduce a large number of nonlinear factors, ignoring its influence will lead to over-prediction or under-prediction of the research results of friction vibration noise

[0007] The above problems will lead to the inability to accurately obtain the thermal-mechanical coupling tribological behavior of the high-speed train braking system during the braking process through convenient and fast simulation analysis in the optimal design process of the high-speed train braking system, which increases the high-speed train braking system with excellent tribological performance. The time cost and economic cost in the process of development, design and optimization of the train braking system have virtually reduced the product quality of the high-speed train braking system

This may cause local high temperature phenomena on the braking interface during the braking process, aggravate friction and wear, deteriorate the contact state, stimulate high-intensity friction vibration noise, harm the physical and mental health of passengers and residents along the line, shorten the service life of brake pads, and even May lead to failure of the braking system, resulting in traffic safety accidents

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