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dc.contributor.advisorGorman, Michael R.
dc.contributor.authorZiola, Steven Michael
dc.date.accessioned2013-02-15T23:33:59Z
dc.date.available2013-02-15T23:33:59Z
dc.date.issued1991-12
dc.identifier.urihttp://hdl.handle.net/10945/28552
dc.descriptionApproved for public release; distribution is unlimiteden_US
dc.description.abstractAlternative methods to first threshold crossing techniques for acoustic emission (AE) source location in dispersive media are presented. The accuracy of source location in dispersive media can be improved by locating frequency components in the transducer outputs to determine the difference in arrival times. Two methods were developed in this study for the arrival time determination. The first involved crosscorrelating the transducer outputs with a cosine wave modulated by a Gaussian pulse to locate a single frequency in the outputs. The second method narrowband filtered the transducer outputs and then crosscorrelated the filtered signals to determine the difference in arrival times. The techniques were experimentally verified by performing lead breaks on the surface of aluminum and graphite/epoxy plates. The results indicate that accurate source location can be attained in dispersive media by taking the wave propagation into account.en_US
dc.description.urihttp://archive.org/details/sourcelocationin00ziol
dc.format.extent108 p.;28 cm.en_US
dc.language.isoen_US
dc.publisherMonterey, California. Naval Postgraduate Schoolen_US
dc.titleSource location in thin plates using crosscorrelation.en_US
dc.typeThesisen_US
dc.contributor.schoolNaval Postgraduate School
dc.contributor.departmentAeronautical Engineering
dc.subject.authoracoustic emissionen_US
dc.subject.authorcompositesen_US
dc.subject.authorplate wavesen_US
dc.subject.authorsource locationen_US
dc.subject.authorcrosscorrelationen_US
etd.thesisdegree.namePh.D. in Aeronautical Engineeringen_US
etd.thesisdegree.levelDoctoralen_US
etd.thesisdegree.disciplineAeronautical Engineeringen_US
etd.thesisdegree.grantorNaval Postgraduate Schoolen_US


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