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Automated vibration-based fault size estimation for ball bearings using Savitzky–Golay differentiators

Ismail, Mohamed AA. and Bierig, Andreas and Sawalhi, Nader (2017) Automated vibration-based fault size estimation for ball bearings using Savitzky–Golay differentiators. Journal of Vibration and Control. SAGE Publications. DOI: 10.1177/1077546317723227 ISSN 1077-5463

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Official URL: http://journals.sagepub.com/doi/abs/10.1177/1077546317723227

Abstract

Vibration-based fault diagnosis has been utilized as a reliable method for identifying ball bearings health since the 1970s. Recently, there has been an increased research effort to develop methods for fault quantification with the aim of estimating the fault size to allow the service life of a ball bearing to be extended beyond the detection stage. These studies have shown that the vibration signal from a localized spall (e.g. fatigue defect) in a ball bearing exhibits features corresponding to two main events, namely, the entry into and the exit from the spall. The time span between these two events is correlated with the spall size. Studies have shown that the entry into the spall is the more challenging event to identify, which often requires extensive signal processing techniques. This paper introduces an automated vibration-based technique for estimating the size of a spall in a ball bearing under axial loading conditions similar to those of linear electro-mechanical actuators. This technique is based on the extraction of the entry/exit events from the vibrational jerk, which are numerically determined from accelerometer data. The differentiation of the acceleration data to estimate jerk signal is performed using a variant of Savitzky–Golay (SG) differentiators, which provide enhancement for the detection of the entry and exit points. Sensible spall size estimations have been achieved for 24 different scenarios of fault sizes, rotor speeds and loads measured on a test rig provided by DLR (German Aerospace Center).

Item URL in elib:https://elib.dlr.de/113583/
Document Type:Article
Title:Automated vibration-based fault size estimation for ball bearings using Savitzky–Golay differentiators
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Ismail, Mohamed AA.mohamed.ismail (at) dlr.deUNSPECIFIED
Bierig, Andreasandreas.bierig (at) dlr.deUNSPECIFIED
Sawalhi, Nadernadersaw (at) hotmail.comUNSPECIFIED
Date:26 July 2017
Journal or Publication Title:Journal of Vibration and Control
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
DOI :10.1177/1077546317723227
Publisher:SAGE Publications
ISSN:1077-5463
Status:Published
Keywords:Bearing faults, spall quantification, prognostics, vibration-based condition monitoring, Savitzky–Golay differentiators
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:fixed-wing aircraft
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Systems and Cabin
Location: Braunschweig
Institutes and Institutions:Institute of Flight Systems > Safety Critical Systems&Systems Engineering
Deposited By: Ismail, Eng. Mohamed AA
Deposited On:07 Aug 2017 14:12
Last Modified:06 Sep 2019 15:18

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