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Method for monitoring and diagnosing flat wheel state of rail vehicle based on VMD

A technology of rail vehicle and diagnosis method, applied in the field of flat wheel fault monitoring, can solve the problems of EMD mode aliasing, missing feature information, etc., and achieve the effect of accurate identification

Inactive Publication Date: 2017-04-26
GUANGZHOU METRO GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, EMD is prone to modal aliasing, resulting in missing important feature information

Method used

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  • Method for monitoring and diagnosing flat wheel state of rail vehicle based on VMD
  • Method for monitoring and diagnosing flat wheel state of rail vehicle based on VMD
  • Method for monitoring and diagnosing flat wheel state of rail vehicle based on VMD

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Embodiment Construction

[0050] The preferred embodiments of the present invention will be described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described here are only used to illustrate and explain the present invention, and are not intended to limit the present invention.

[0051] Such as Figure 1 to Figure 13 As shown, the method for monitoring and diagnosing the status of the flat wheels of rail vehicles based on VMD in the present invention adopts the method of variational mode decomposition VMD, which is a new method of modal estimation, by iteratively searching the variational problem Optimal solution, thus decomposing the frequency centers and bandwidths of the components. At the same time, the variational mode decomposition VMD is applied to the flat wheel collision fault diagnosis. Through the comparative analysis with EMD, the superiority of the variational mode decomposition VMD in diagnosing this type of fault is obtained. ...

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Abstract

The invention discloses a method for monitoring and diagnosing a flat wheel state of a rail vehicle based on VMD. The method comprises the following steps of acquiring a vibration signal of a flat wheel through a sensor which is mounted in a rail; performing VMD variation modal decomposition on the vibration signal and obtaining a plurality of modals in different frequencies; constructing an envelope spectrum entropy characteristic for the plurality of modals; selecting an envelope spectrum entropy value with high consistency with the vibration signal from the envelope spectrum entropy characteristic; and inputting a plurality of selected envelope spectrum entropy values into a training support vector machine for performing identification, thereby identifying the working condition of the flat wheel. The method for monitoring and diagnosing the flat wheel state of the rail vehicle based on VMD has an advantage of high flat wheel working condition identification accuracy.

Description

technical field [0001] The invention belongs to the technical field of flat wheel fault monitoring, and in particular relates to a VMD-based method for monitoring and diagnosing the state of a rail vehicle flat wheel. Background technique [0002] Wheels are the key components of rail vehicles. Under the background of frequent train speed increases and increasing loads, car body failures become complex and diverse, and flat wheel failures are one of them. The generation of flat wheels will lead to problems such as vehicle bearing damage, shaft temperature rise, and rail corrugation. There are four working conditions that need to be monitored, specifically, the tread is normal, the tread is scratched, the tread is peeled off, and the circumference is worn. There are many non-contact on-line monitoring methods for flat wheel faults. The common methods at home and abroad include displacement detection method, electrical signal detection method, vibration analysis method, etc. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M17/10
CPCG01M17/10
Inventor 杨玲芝方恩权敖银辉
Owner GUANGZHOU METRO GRP CO LTD
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