Zhanpeng, Hao
(2014)
Optimal wave propagation-based nondestructive test design for quantitative damage characterization.
Master's Thesis, University of Pittsburgh.
(Unpublished)
This is the latest version of this item.
Abstract
Nondestructive testing (NDT) has been widely used for damage identification and inverse characterization of material properties in several fields of science and engineering, from structural engineering to medicine. However, there are several common challenges inherent in the evaluation of structures and systems, including the potential for excessive computational expense and ill-posedness of the inverse problem. Numerical methods, such as the finite element method, provide substantial benefits in terms of solution capabilities, but the analysis for NDT applications in realistic structures often requires substantial computational time and power. Furthermore, limitations on the quantity and quality of measurement data can cause the evaluation problem to require even more computational effort and/or lead to solution non-uniqueness or nonexistence.
The present work introduces a general approach to optimal wave propagation-based NDT design for damage characterization applications. More specifically, the objective of this work is to improve the accuracy and efficiency of the damage characterization process by optimizing the parameters of the NDT such as the locations of sensors and actuators. The NDT design approach developed is based on maximizing the sensitivity of the NDT response measurements to changes in the material properties to be determined by the evaluation, while simultaneously minimizing the redundancy of response measurements. Two simulated case studies are presented to evaluate the performance of the optimal wave propagation-based NDT design approach. Both examples consisted of thin plate structures with a damage field that was represented by changes in the Young's modulus distribution throughout the structure. In order to provide practical relevance, the NDT method considered was based on commonly used ultrasonic testing with piezoelectric sensors and actuators. The optimal NDT designs corresponding to maximized sensitivity and minimized response redundancy are shown to provide substantially improved evaluation solution efficiency and accuracy for quantitative damage characterization in comparison to standard approaches.
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Details
| Item Type: |
University of Pittsburgh ETD
|
| Status: |
Unpublished |
| Creators/Authors: |
|
| ETD Committee: |
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| Date: |
16 June 2014 |
| Date Type: |
Publication |
| Defense Date: |
31 March 2014 |
| Approval Date: |
16 June 2014 |
| Submission Date: |
7 April 2014 |
| Access Restriction: |
No restriction; Release the ETD for access worldwide immediately. |
| Number of Pages: |
70 |
| Institution: |
University of Pittsburgh |
| Schools and Programs: |
Swanson School of Engineering > Civil and Environmental Engineering |
| Degree: |
MS - Master of Science |
| Thesis Type: |
Master's Thesis |
| Refereed: |
Yes |
| Uncontrolled Keywords: |
Nondestructive Test, Inverse Problem, Ultrasonic Testing, Optimization Sensor Actuator |
| Date Deposited: |
16 Jun 2014 17:30 |
| Last Modified: |
15 Nov 2016 14:18 |
| URI: |
http://d-scholarship.pitt.edu/id/eprint/20788 |
Available Versions of this Item
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Optimal wave propagation-based nondestructive test design for quantitative damage characterization. (deposited 16 Jun 2014 17:30)
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