Ultrasonic acoustic health monitoring of ball bearings using neural network pattern classification of power spectral density

Simple item page
dc.contributor.authorKirchner, William Thomasen
dc.contributor.committeechairSouthward, Steve C.en
dc.contributor.committeememberInman, Daniel J.en
dc.contributor.committeememberAhmadian, Mehdien
dc.contributor.departmentMechanical Engineeringen
dc.date.accessioned2014-03-14T20:49:32Zen
dc.date.adate2010-01-12en
dc.date.available2014-03-14T20:49:32Zen
dc.date.issued2009-11-11en
dc.date.rdate2010-01-12en
dc.date.sdate2009-12-14en
dc.description.abstractThis thesis presents a generic passive non-contact based acoustic health monitoring approach using ultrasonic acoustic emissions (UAE) to facilitate classification of bearing health via neural networks. This generic approach is applied to classifying the operating condition of conventional ball bearings. The acoustic emission signals used in this study are in the ultrasonic range (20-120 kHz), which is significantly higher than the majority of the research in this area thus far. A direct benefit of working in this frequency range is the inherent directionality of the microphones capable of measurement in this range, which becomes particularly useful when operating in environments with low signal-to-noise ratios. Using the UAE power spectrum signature, it is possible to pose the health monitoring problem as a multi-class classification problem, and make use of a multi-layer artificial neural network (ANN) to classify the UAE signature. One major problem limiting the usefulness of ANN's for failure classification is the need for large quantities of training data. Artificial training data, based on statistical properties of a significantly smaller experimental data set is created using the combination of a normal distribution and a coordinate transformation. The artificial training data provides a sufficient sized data set to train the neural network, as well as overcome the curse of dimensionality. The combination of the artificial training methods and ultrasonic frequency range being used results in an approach generic enough to suggest that this particular method is applicable to a variety of systems and components where persistent UAE exist.en
dc.description.degreeMaster of Scienceen
dc.identifier.otheretd-12142009-110105en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-12142009-110105/en
dc.identifier.urihttp://hdl.handle.net/10919/36130en
dc.publisherVirginia Techen
dc.relation.haspartBeena_Vision_Copyright_Approval.pdfen
dc.relation.haspartAvisoft_Copyright_Approval.pdfen
dc.relation.haspartKirchner_WT_T_2009.pdfen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectArtificial Training Dataen
dc.subjectBearingsen
dc.subjectArtificial Neural Networksen
dc.subjectHealth Monitoringen
dc.subjectAcousticsen
dc.subjectEmissionsen
dc.subjectUltrasonicen
dc.titleUltrasonic acoustic health monitoring of ball bearings using neural network pattern classification of power spectral densityen
dc.typeThesisen
thesis.degree.disciplineMechanical Engineeringen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen

Files

Original bundle
Now showing 1 - 3 of 3
Thumbnail Image
Name:
Kirchner_WT_T_2009.pdf
Size:
16.81 MB
Format:
Adobe Portable Document Format
Download
Thumbnail Image
Name:
Beena_Vision_Copyright_Approval.pdf
Size:
109.27 KB
Format:
Adobe Portable Document Format
Download
Thumbnail Image
Name:
Avisoft_Copyright_Approval.pdf
Size:
103.76 KB
Format:
Adobe Portable Document Format
Download

Collections

Masters Theses