Implementing Impedance - Based Health Monitoring

Simple item page
dc.contributor.authorRaju, Vinoden
dc.contributor.committeechairCudney, Harley H.en
dc.contributor.committeememberLalande, Fredericen
dc.contributor.committeememberDuke, John C. Jr.en
dc.contributor.departmentMechanical Engineeringen
dc.date.accessioned2014-03-14T20:47:43Zen
dc.date.adate1997-12-11en
dc.date.available2014-03-14T20:47:43Zen
dc.date.issued1997-11-14en
dc.date.rdate1997-12-11en
dc.date.sdate1997-11-14en
dc.description.abstractThis work is an experimental study of applying an impedance-based health monitoring technique to complex structures. The work is presented in three parts. In the first part we consider effects of the following three factors on damage detection abilities: actuator excitation level, test wire length and ambient conditions (temperature, structural loading and vibration). It was concluded that increasing the applied voltage improves the signal to noise ratio and damage detection abilities. Test wire lengths under 30m do not affect damage detection abilities. The technique is able to distinguish and detect damage even with variations in temperature, structural loading and vibration. In the second part we apply our health monitoring technique to a complex truss structure and a massive steel steam header. We discovered that with multiplexing (acquiring a single signal from distributed actuators) the actuators on the truss structure we could detect damage but with less location information. Damage detection on the steel pipe ended in inconclusive results. The use of this technique on massive structures needs further investigation. Finally, we conducted a detailed experimental study of monitoring the integrity of composite-reinforced masonry structures. We developed a software package which enables even a casual user to determine if significant damage has occurred in these structures. The technique was successfully applied to detect damage (particularly due to delamination) in these composite-concrete structures. Most significantly, the technique was also able to detect damage well in advance of actual failure. This work relies mainly on frequency response plots and damage metric charts to present the data and to arrive at any conclusions. While frequency response plots give a qualitative approach to the analysis, damage metric charts attempt to quantify the data.en
dc.description.degreeMaster of Scienceen
dc.identifier.otheretd-111097-14850en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-111097-14850/en
dc.identifier.urihttp://hdl.handle.net/10919/35657en
dc.publisherVirginia Techen
dc.relation.haspartETD.PDFen
dc.relation.haspartCHAPTE_1.PDFen
dc.relation.haspartCHAPTE_2.PDFen
dc.relation.haspartCHAPTE_3.PDFen
dc.relation.haspartCHAPTE_4.PDFen
dc.relation.haspartCHAPTE_5.PDFen
dc.relation.haspartCHAPTE_6.PDFen
dc.relation.haspartCHAPTE_7.PDFen
dc.relation.haspartCHAPTE_8.PDFen
dc.relation.haspartREFERE_1.PDFen
dc.relation.haspartAPP-A.PDFen
dc.relation.haspartAPP-B.PDFen
dc.relation.haspartAPP-C.PDFen
dc.relation.haspartAPP-D.PDFen
dc.relation.haspartAPP-E.PDFen
dc.relation.haspartAPP-F.PDFen
dc.relation.haspartVITA.PDFen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectImpedance-based health monitoringen
dc.subjectSmart structuresen
dc.subjectPiezoelectric actuator/sensor patchesen
dc.subjectglobal NDE techniqueen
dc.subjecthealth monitoring of composite-reinforced concreteen
dc.titleImplementing Impedance - Based Health Monitoringen
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 - 5 of 17
Thumbnail Image
Name:
ETD.PDF
Size:
39.96 KB
Format:
Adobe Portable Document Format
Download
Thumbnail Image
Name:
CHAPTE_1.PDF
Size:
107.08 KB
Format:
Adobe Portable Document Format
Download
Thumbnail Image
Name:
CHAPTE_2.PDF
Size:
52.78 KB
Format:
Adobe Portable Document Format
Download
Thumbnail Image
Name:
CHAPTE_3.PDF
Size:
208.49 KB
Format:
Adobe Portable Document Format
Download
Thumbnail Image
Name:
CHAPTE_4.PDF
Size:
285.81 KB
Format:
Adobe Portable Document Format
Download

Collections

Masters Theses