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dc.contributor.authorHall, James Stromanen_US
dc.date.accessioned2011-09-22T17:50:39Z
dc.date.available2011-09-22T17:50:39Z
dc.date.issued2011-06-29en_US
dc.identifier.urihttp://hdl.handle.net/1853/41159
dc.description.abstractUltrasonic guided wave imaging methods offer a cost-effective mechanism to perform in situ structural health monitoring (SHM) of large plate-like structures, such as commercial aircraft skins, ship hulls, storage tanks, and civil structures. However, current limits in imaging quality, environmental sensitivities, and implementation costs, among other things, are preventing widespread commercial adoption. The research presented here significantly advances state of the art guided wave imaging techniques using inexpensive, spatially distributed arrays of piezoelectric transducers. Novel adaptive imaging techniques are combined with in situ estimation and compensation of propagation parameters; e.g., dispersion curves and transducer transfer functions, to reduce sensitivity to unavoidable measurement inaccuracies and significantly improve resolution and reduce artifacts in guided wave images. The techniques can be used not only to detect and locate defects or damage, but also to characterize the type of damage. The improved ability to detect, locate, and now characterize defects or damage using a sparse array of ultrasonic transducers is intended to assist in the establishment of in situ guided wave imaging as a technically and economically viable tool for long-term monitoring of plate-like engineering structures.en_US
dc.publisherGeorgia Institute of Technologyen_US
dc.subjectDispersion compensationen_US
dc.subjectMVDRen_US
dc.subjectAdaptive imagingen_US
dc.subjectLamb wavesen_US
dc.subjectMinimum variance imagingen_US
dc.subjectSparse arrayen_US
dc.subjectParameter estimationen_US
dc.subjectDispersion estimationen_US
dc.subjectDamage characterizationen_US
dc.subjectGuided wavesen_US
dc.subjectUltrasonicsen_US
dc.subjectDistributed arrayen_US
dc.subjectStructural health monitoringen_US
dc.subjectNondestructive evaluationen_US
dc.subject.lcshNondestructive testing
dc.subject.lcshUltrasonic imaging
dc.titleAdaptive dispersion compensation and ultrasonic imaging for structural health monitoringen_US
dc.typeDissertationen_US
dc.description.degreePh.D.en_US
dc.contributor.departmentElectrical and Computer Engineeringen_US
dc.description.advisorCommittee Chair: Michaels, Jennifer E.; Committee Member: Ghovanloo, Maysam; Committee Member: Jacobs, Laurence J.; Committee Member: Leamy, Michael J.; Committee Member: McClellan, James H.; Committee Member: Michaels, Thomas E.en_US


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