A Method for Early Weak Fault Diagnosis of Aeroengine Intermediate Bearing

Abstract

The invention discloses an early weak fault diagnosis method of an aero-engine intermediate bearing, which belongs to the technical field of aero-engine fault detection. It includes the following steps: collecting the fault signal of the intermediate bearing; using the AR model to remove the deterministic signal generated by the periodic rotation of the engine rotor; performing MED inverse filtering on the processed fault signal to enhance the impact component in the fault signal; using the CEEMD method to process The final fault signal is decomposed, and the effective modal component is screened according to the kurtosis value index and autocorrelation function to reconstruct the intermediate bearing fault signal with noise reduction; the output energy of the noise reduction signal is obtained through the Teager energy operator and its envelope is calculated The early weak fault diagnosis of the engine intermediary bearing is realized by analyzing the frequency components with prominent amplitude in the envelope spectrum. The present invention obtains fault characteristic signals reflecting bearing faults through preprocessing, screening, reconstruction and demodulation of fault signals, thereby accurately diagnosing early weak faults of intermediate bearings.

Description

technical field [0001] The invention relates to the technical field of aero-engine fault detection, in particular to an early weak fault diagnosis method for an aero-engine intermediary bearing. Background technique [0002] In order to reduce weight, intermediary main bearings are commonly used in the rotor system of modern dual-rotor turbofan engines. The working conditions of intermediary main bearings are characterized by high temperature, high speed, large load changes, and difficult lubrication conditions, which lead to fatigue spalling and spotting during operation. Corrosion, wear and other failures. As a key component of the rotor support system of an aero-engine, its failure will pose a great threat to flight safety. According to statistics, since 2001, due to the failure of the No. There were 26 cases, resulting in 2 second-class flight accidents, causing direct economic losses of several billion yuan. The fault diagnosis of the No. 5 intermediate bearing of this...

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Problems solved by technology

However, this invention aims to build a fault diagnosis model for engineering applications, which fails to reflect the effective fault characteristic signals of bearing faults and cannot solve the above technical problems

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