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dc.contributor.authorPitchford, Coreyen_US
dc.date.accessioned2014-03-14T20:44:52Z
dc.date.available2014-03-14T20:44:52Z
dc.date.issued2007-08-31en_US
dc.identifier.otheretd-09062007-140545en_US
dc.identifier.urihttp://hdl.handle.net/10919/34946
dc.description.abstractWind power is a fast-growing source of non-polluting, renewable energy with vast potential. However, current wind technology must be improved before the potential of wind power can be fully realized. One of the key components in improving wind turbines is their blades. Blade failure is very costly because blade failure can damage other blades, the wind turbine itself, and possibly other wind turbines. A successful structural health monitoring (SHM) system incorporated into wind turbines could extend blade life and allow for less conservative designs. Impedance-based SHM is a method which has shown promise on a wide variety of structures. The technique utilizes small piezoceramic (PZT) patches attached to a structure as self-sensing actuators to both excite the structure with high-frequency excitations, and monitor any changes in structural mechanical impedance. By monitoring the electrical impedance of the PZT, assessments can be made about the integrity of the mechanical structure. Recent advances in hardware systems with onboard computing, including actuation and sensing, computational algorithms, and wireless telemetry, have improved the accessibility of the impedance method for in-field measurements. The feasibility of implementing impedance-based SHM on wind turbine blades is investigated in this work. Experimentation was performed to determine the capability of the method to detect damage on blades. First, tests were run to detect both indirect and actual forms of damage on a section of an actual wind turbine blade provided by Sandia National Laboratories. Additional tests were run on the same blade section using a high-frequency response function method of SHM for comparison. Finally, based on the results of the initial testing, the impedance method was utilized in an attempt to detect damage during a fatigue test of an experimental wind turbine blade at the National Renewable Energy Laboratoryâ s National Wind Technology Center.en_US
dc.publisherVirginia Techen_US
dc.relation.haspartpitchford_etd.pdfen_US
dc.rightsI hereby certify that, if appropriate, I have obtained and attached hereto a written permission statement from the owner(s) of each third party copyrighted matter to be included in my thesis, dissertation, or project report, allowing distribution as specified below. I certify that the version I submitted is the same as that approved by my advisory committee. I hereby grant to Virginia Tech or its agents the non-exclusive license to archive and make accessible, under the conditions specified below, my thesis, dissertation, or project report in whole or in part in all forms of media, now or hereafter known. I retain all other ownership rights to the copyright of the thesis, dissertation or project report. I also retain the right to use in future works (such as articles or books) all or part of this thesis, dissertation, or project report.en_US
dc.subjectwind turbine bladesen_US
dc.subjectwind turbinesen_US
dc.subjectimpedance methoden_US
dc.subjectstructural health monitoringen_US
dc.titleImpedance-Based Structural Health Monitoring of Wind Turbine Bladesen_US
dc.typeThesisen_US
dc.contributor.departmentMechanical Engineeringen_US
dc.description.degreeMaster of Scienceen_US
thesis.degree.nameMaster of Scienceen_US
thesis.degree.levelmastersen_US
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen_US
thesis.degree.disciplineMechanical Engineeringen_US
dc.contributor.committeechairInman, Daniel J.en_US
dc.contributor.committeememberGoulbourne, Nakhiah C.en_US
dc.contributor.committeememberJohnson, Martin E.en_US
dc.contributor.committeememberPeairs, Daniel M.en_US
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-09062007-140545/en_US
dc.date.sdate2007-09-06en_US
dc.date.rdate2007-11-21
dc.date.adate2007-11-21en_US


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