A Fault Feature Extraction Method of Rolling Bearing Vibration Signal

Abstract

The invention discloses a rolling bearing vibration signal fault feature extraction method. The method, based on a singular spectrum SSA and a linear autoregressive model AR, comprises the following steps: 1, time domain vibration acceleration signals of a running vehicle are acquired in real time, and the acquired vibration acceleration signals are subjected to subsection processing; 2, as for each section of vibration acceleration signals in the first step, singular spectrum analysis is applied to noise removal; 3, the vibration acceleration signals after denoising in the second step are subjected to stationarity test, if the stationarity test is not passed, differential processing needs to be carried out until the vibration acceleration signals pass the stationarity test; and 4, the linear autoregressive model is used for modeling, a model order and a model coefficient are determined, and according to the model coefficient, fault features are determined. The method can extract rolling bearing vibration signal fault feature and is simple and practicable, and the application value is good.

Description

technical field [0001] The invention belongs to the technical field of urban rail train rolling bearing fault monitoring and safety early warning, in particular to a rolling bearing vibration signal fault feature extraction method. Background technique [0002] my country's urban rail transit industry is currently in a stage of rapid development. The construction plans of more than 40 cities have been approved, and the total mileage has reached more than 8,000 kilometers. About 300 billion yuan. It is estimated that around 2020, my country will form a more complete urban rail transit network to realize the organic connection between intercity passenger lines, urban light rail lines, urban subway lines and railway passenger lines, making it more convenient for passengers to transfer, and providing services for the general public. better service. [0003] The urban rail train is a complex dynamic system composed of electromechanical integration. The coupling relationship betwe...

AI Technical Summary

Problems solved by technology

When the urban rail train is running at high speed, the contact stress repeatedly acts on the bearing surface, which will cause damage such as bearing erosion and indentation, and then cause failures such as bearing fracture and burning, which will seriously cause the failure of the urban rail train running system and endanger the train. safe operation of

[0004] At present, urban rail trains mainly use offline detection methods and regular detection methods to monitor the running status of trains. Traditional urban rail train detection methods cannot timely understand the running status of urban rail train rolling bearings, and cannot predict the failure of rolling bearings in advance, which seriously hinders urban The Development of the Rail Transit Industry

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