eprintid: 20788
rev_number: 30
userid: 3267
dir: disk0/00/02/07/88
datestamp: 2014-06-16 17:30:25
lastmod: 2016-11-15 14:18:09
status_changed: 2014-06-16 17:30:25
type: thesis_degree
succeeds: 20786
metadata_visibility: show
contact_email: punkjazz@live.cn
item_issues_id: thesis_degree_versioning
item_issues_type: thesis_degree_versioning
item_issues_description: ETD 20788 is using versioning.
item_issues_timestamp: 2014-04-08 06:22:52
item_issues_status: discovered
item_issues_count: 1
eprint_status: archive
creators_name: Zhanpeng, Hao
creators_email: punkjazz@live.cn
title: Optimal wave propagation-based nondestructive test design for quantitative damage characterization
ispublished: unpub
divisions: sch_eng_civilenvironmental
full_text_status: public
keywords: Nondestructive Test, Inverse Problem, Ultrasonic Testing, Optimization Sensor Actuator
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.
date: 2014-06-16
date_type: published
pages: 70
institution: University of Pittsburgh
refereed: TRUE
etdcommittee_type: committee_chair
etdcommittee_type: committee_member
etdcommittee_type: committee_member
etdcommittee_type: thesis_advisor
etdcommittee_name: Brigham, John
etdcommittee_name: Yu, Qiang
etdcommittee_name: Lin, Jeen Shang
etdcommittee_name: Brigham, John
etdcommittee_email: brigham@pitt.edu
etdcommittee_email: QIY15@pitt.edu
etdcommittee_email: jslin@pitt.edu
etdcommittee_email: brigham@pitt.edu
etdcommittee_id: BRIGHAM
etdcommittee_id: QIY15
etdcommittee_id: JSLIN
etdcommittee_id: BRIGHAM
etd_defense_date: 2014-03-31
etd_approval_date: 2014-06-16
etd_submission_date: 2014-04-07
etd_release_date: 2014-06-16
etd_access_restriction: immediate
etd_patent_pending: FALSE
thesis_type: thesis
degree: MS
citation:   Zhanpeng, Hao  (2014) Optimal wave propagation-based nondestructive test design for quantitative damage characterization.  Master's Thesis, University of Pittsburgh.    (Unpublished)  
document_url: http://d-scholarship-dev.library.pitt.edu/20788/1/haoz_etd2014.pdf