Guided-wave structural health monitoring
dc.contributor.author | Raghavan, Ajay | |
dc.contributor.advisor | Cesknik, Carlos E. | |
dc.date.accessioned | 2010-07-12T15:23:00Z | |
dc.date.available | NO_RESTRICTION | en_US |
dc.date.available | 2010-07-12T15:23:00Z | |
dc.date.issued | 2007 | |
dc.date.submitted | 2007 | |
dc.identifier.uri | https://hdl.handle.net/2027.42/77498 | |
dc.description.abstract | Guided-wave (GW) approaches have shown potential in various initial laboratory demonstrations as a solution to structural health monitoring (SHM) for damage prognosis. This thesis starts with an introduction to and a detailed survey of this field. Some critical areas where further research was required and those that were chosen to be addressed herein are highlighted. Those were modeling, design guidelines, signal processing and effects of elevated temperature. Three-dimensional elasticity-based models for GW excitation and sensing by finite dimensional surface-bonded piezoelectric wafer transducers and anisotropic piezocomposites are developed for various configurations in isotropic structures. The validity of these models is extensively examined in numerical simulations and experiments. These models and other ideas are then exploited to furnish a set of design guidelines for the excitation signal and transducers in GW SHM systems. A novel signal processing algorithm based on chirplet matching pursuits and mode identification for pulse-echo GW SHM is proposed. The potential of the algorithm to automatically resolve and identify overlapping, multimodal reflections is discussed and explored with numerical simulations and experiments. Next, the effects of elevated temperature as expected in internal spacecraft structures on GW transduction and propagation are explored based on data from the literature incorporated into the developed models. Results from the model are compared with experiments. The feasibility of damage characterization at elevated temperatures is also investigated. An extension of the modeling effort for GW excitation by finite-dimensional piezoelectric wafer transducers to composite plates is also proposed and verified by numerical simulations. At the end, future directions for research to make this technology more easily deployable in field applications are suggested. | en_US |
dc.format.extent | 6919396 bytes | |
dc.format.mimetype | application/pdf | |
dc.language.iso | en_US | en_US |
dc.subject | Lamb Wave | |
dc.subject | Piezoelectric Transducer | |
dc.subject | Macro Fiber Composite | |
dc.subject | 3-D Elasticity Modeling | |
dc.subject | Chirplet Matching Pursuit | |
dc.subject | Elevated Temperature Effects | |
dc.subject | Damage Prognosis | |
dc.subject | Algorithms | |
dc.subject | Guided Wave | en_US |
dc.subject | Structural Health Monitoring | en_US |
dc.title | Guided-wave structural health monitoring | en_US |
dc.type | Thesis | en_US |
dc.description.thesisdegreename | PhD | en_US |
dc.description.thesisdegreediscipline | Aerospace Engineering | en_US |
dc.description.thesisdegreegrantor | University of Michigan | en_US |
dc.contributor.committeemember | Grosh, Karl | |
dc.contributor.committeemember | Waas, Anthony M. | |
dc.contributor.committeemember | Lynch, Jerome P. | |
dc.identifier.uniqname | ajayr | en_US |
dc.description.bitstreamurl | http://deepblue.lib.umich.edu/bitstream/2027.42/77498/1/Raghavan_PhD_thesis_GWSHM.pdf | |
dc.owningcollname | Dissertations and Theses (Ph.D. and Master's) |
Files in this item
Remediation of Harmful Language
The University of Michigan Library aims to describe library materials in a way that respects the people and communities who create, use, and are represented in our collections. Report harmful or offensive language in catalog records, finding aids, or elsewhere in our collections anonymously through our metadata feedback form. More information at Remediation of Harmful Language.
Accessibility
If you are unable to use this file in its current format, please select the Contact Us link and we can modify it to make it more accessible to you.