Research on early weak structural damage detection of aeroengine intershaft bearing based on acoustic emission technology. (November 2021)

• Record Type: Journal Article
• Authors: Liang, Zheming; Wang, Anna; Yu, Yang; Yang, Ping
• Is Part Of: Structural health monitoring. Volume 20:Number 6(2021)
• Page Start: 3113
• Page End: 3122
• Publication Date: 2021-11
• Subjects: Acoustic emission -- aero engine -- intershaft bearing -- structural damage -- envelope spectrum; Structural health monitoring -- Periodicals; Structural stability -- Periodicals; Strength of materials -- Periodicals; Nondestructive testing -- Periodicals; Constructions -- Stabilité -- Périodiques; Résistance des matériaux -- Périodiques; Contrôle non destructif -- Périodiques; Electronic journals; 624.17
• DOI: 10.1177/1475921720980356
• Languages: English
• ISSNs: 1475-9217

Abstract

Until now, there is no effective method to detect the early weak structural damage of the aero engine intershaft bearing. In this article, an online method based on acoustic emission technology is used to detect the early weak structural damage of aeroengine intershaft bearing. The combination of maximum correlated kurtosis deconvolution and bandpass filter is proposed to enhance and denoise fault characteristic signals of the aero engine intershaft bearing. The Hilbert envelope demodulation is used to extracting the bear fault characteristic frequency. Under aeroengine working conditions, the experiment of an intershaft bearing with outer ring fault is carried out. The result shows that bearing outer ring fault characteristic frequency and bearing vibration frequencies clearly appear in the envelope spectrum of the acoustic emission signal. Therefore, online detection of early weak structure damage of aeroengine intershaft bearing is realized by acoustic emission technology under the background of strong noise.