Structural Health Monitoring Using Multiple Piezoelectric Sensors and Actuators

dc.contributor.authorKabeya, Kazuhisa IIIen
dc.contributor.committeechairCudney, Harley H.en
dc.contributor.committeememberInman, Daniel J.en
dc.contributor.committeememberSaunders, William R.en
dc.contributor.committeememberHardy, Christopher R.en
dc.contributor.committeememberDwyer, John L.en
dc.contributor.committeememberTaylor, Larry T.en
dc.contributor.committeememberKazakevich, Yuri V.en
dc.contributor.departmentMechanical Engineeringen
dc.date.accessioned2014-03-14T20:51:32Zen
dc.date.adate1998-06-03en
dc.date.available2014-03-14T20:51:32Zen
dc.date.issued1998-04-30en
dc.date.rdate1999-06-03en
dc.date.sdate1998-04-30en
dc.description.abstractA piezoelectric impedance-based structural health monitoring technique was developed at the Center for Intelligent Material Systems and Structures. It has been successfully implemented on several complex structures to detect incipient-type damage such as small cracks or loose connections. However, there are still some problems to be solved before full scale development and commercialization can take place. These include: i) the damage assessment is influenced by ambient temperature change; ii) the sensing area is small; and iii) the ability to identify the damage location is poor. The objective of this research is to solve these problems in order to apply the impedance-based structural health monitoring technique to real structures. First, an empirical compensation technique to minimize the temperature effect on the damage assessment has been developed. The compensation technique utilizes the fact that the temperature change causes vertical and horizontal shifts of the signature pattern in the impedance versus frequency plot, while damage causes somewhat irregular changes. Second, a new impedance-based technique that uses multiple piezoelectric sensor-actuators has been developed which extends the sensing area. The new technique relies on the measurement of electrical transfer admittance, which gives us mutual information between multiple piezoelectric sensor-actuators. We found that this technique increases the sensing region by at least an order of magnitude. Third, a time domain technique to identify the damage location has been proposed. This technique also uses multiple piezoelectric sensors and actuators. The basic idea utilizes the pulse-echo method often used in ultrasonic testing, together with wavelet decomposition to extract traveling pulses from a noisy signal. The results for a one-dimensional structure show that we can determine the damage location to within a spatial resolution determined by the temporal resolution of the data acquisition. The validity of all these techniques has been verified by proof-of-concept experiments. These techniques help bring conventional impedance-based structural health monitoring closer to full scale development and commercialization.en
dc.description.degreeMaster of Scienceen
dc.identifier.otheretd-42998-155530en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-42998-155530/en
dc.identifier.urihttp://hdl.handle.net/10919/36709en
dc.publisherVirginia Techen
dc.relation.haspartetd.pdfen
dc.relation.haspartchapter1.pdfen
dc.relation.haspartchapter2.pdfen
dc.relation.haspartchapter3.pdfen
dc.relation.haspartchapter4.pdfen
dc.relation.haspartchapter5.pdfen
dc.relation.haspartreferences.pdfen
dc.relation.haspartvita.pdfen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectsmart structuresen
dc.subjectstructural health monitoringen
dc.subjectpiezoelectric sensors and actuatorsen
dc.subjectimpedance measurementen
dc.subjecttemperature compensationen
dc.subjectsensing areaen
dc.subjectelectrical transfer admittanceen
dc.subjectdamage locationen
dc.subjectpulse-echo methoden
dc.subjectwavelet decompositionen
dc.titleStructural Health Monitoring Using Multiple Piezoelectric Sensors and Actuatorsen
dc.typeThesisen
thesis.degree.disciplineMechanical Engineeringen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen

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