Structural damage detection using ultrasonic guided waves under varying ambient temperature and loading environments
Abstract/Contents
- Abstract
- Accurate interpretation of in-situ piezoelectric sensor signals for guided-wave based structural health monitoring is a challenging task owing to the influence of varying environments and operating conditions. This research presents the development of environmental compensation models based on physical insight to aid in structural damage detection using in-situ piezo-sensor signals. Analytical as well as numerical simulation studies are carried out to understand the influence of varying ambient temperature and loading environments on signals collected from thin, metallic, plate-like structures, instrumented with surface mounted piezoelectric transducers. A system identification model is proposed wherein changes in the signal parameters are related to the changes in the material properties of different physical components. Numerical compensation models are developed and validated to estimate piezo-sensor response under known strain field and temperature distribution in a structure. Numerically reconstructed first wave packets of the sensor signals are found to match quite well with the experimental measurements for both flat as well as stiffened plates made up of aluminum alloy. A very limited amount of in-situ sensor measurements is required to estimate unknown model parameters, underlying the practical efficacy and usefulness of the proposed compensation methodology. The outputs of the compensation models are also linked with an anomaly detection algorithm to detect structural damage under varying environments.
Description
| Type of resource | text |
|---|---|
| Form | electronic; electronic resource; remote |
| Extent | 1 online resource. |
| Publication date | 2014 |
| Issuance | monographic |
| Language | English |
Creators/Contributors
| Associated with | Roy, Surajit |
|---|---|
| Associated with | Stanford University, Department of Aeronautics and Astronautics. |
| Primary advisor | Chang, Fu-Kuo |
| Thesis advisor | Chang, Fu-Kuo |
| Thesis advisor | Christensen, R. M. (Richard M.) |
| Thesis advisor | Goebel, Kai |
| Advisor | Christensen, R. M. (Richard M.) |
| Advisor | Goebel, Kai |
Subjects
| Genre | Theses |
|---|
Bibliographic information
| Statement of responsibility | Surajit Roy. |
|---|---|
| Note | Submitted to the Department of Aeronautics and Astronautics. |
| Thesis | Ph.D. Stanford University 2014 |
| Location | electronic resource |
Access conditions
- Copyright
- © 2014 by Surajit Roy
- License
- This work is licensed under a Creative Commons Attribution Non Commercial 3.0 Unported license (CC BY-NC).
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