Locomotive vehicle running gear bearing holder fault pre-alarm method

Abstract

The invention provides a locomotive vehicle running gear bearing holder fault pre-alarm method.According to the method, a composite sensor and a detection instrument are installed on a locomotive vehicle running gear bearing seat for online data acquisition and preprocessing, time domain impact SVi data, time domain vibration Vi data and temperature data Ti are generated, the time domain impact characteristic value SVmax and the time domain vibration characteristic value VRMS are calculated, fast Fourier transform is conducted, a corresponding shock frequency spectrum and a vibration frequency spectrum are obtained, an impact fault characteristic mark Ib and a vibration fault characteristic mark Vb are obtained through processing, a temperature pre-alarm mark Tb is obtained through calculation with temperature data, trend analysis is conducted on the Ib, the Vb and the Tb sequence data, and an alarm or pre-alarm is given according to the trend analysis result.The locomotive vehicle running gear bearing holder fault pre-alarm method is high in diagnosis accuracy, easy to master, high in operability and wide in application range; scientific operation or maintenance guidance opinion is provided, planned maintenance is converted to state maintenance, safety of the locomotive vehicle is greatly improved, maintenance cost is saved, and operation economic benefits are raised.

Description

technical field [0001] The invention belongs to the field of state monitoring and fault diagnosis of rotating machinery, in particular to a fault pre-alarm method for a bearing cage of a running part of a locomotive and vehicle. Background technique [0002] The invention relates to a bearing cage as a main part of a rolling bearing, which is used for isolating rolling bodies and correctly guiding the rolling bodies to roll on the raceway; orienting the rolling bodies and reducing frictional force. For the running part bearings of rail transit locomotives, such as motor drive end bearings and axle box bearings, if there is a fault in the bearing cage, such as: deformation, cracks or fractures, it will cause the internal rolling elements of the bearing to contact the inner and outer rings or retainers during work. Edge collision, friction wear and heat generation, the rolling elements change from rolling to rolling and sliding, and disorder occurs, the normal working conditio...

AI Technical Summary

Problems solved by technology

This kind of diagnosis and alarm decision-making method has a certain effect on the fault diagnosis of the inner ring, outer ring and rolling element of the bearing, but it is not ideal for the bearing fault diagnosis caused by the fault of the bearing cage.

However, from the analysis of domestic and foreign research on the bearing cages of rolling stock running parts of railway locomotives, EMUs, subways and urban rail vehicles, only relevant research has been done on design, manufacturing, materials and processes. The research on fault diagnosis and alarm decision-making methodology is still blank at home and abroad.

[0004] Since the fault characteristic frequency of the rolling stock running part bearing cage is in the low frequency band, it is easy to be interfered by other information, coupled with the complexity of the rolling stock running part bearing bearing load and the unique motion characteristics of the cage, the bearing cage failure The diagnostic method of diagnosis and its pre-alarm method have gradually become the bottleneck of the safety monitoring of the running part of the rolling stock, which has a great impact on guiding the progress of the repair process of the rolling stock, that is, from regular maintenance to condition-based maintenance.

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