Degree Type

Dissertation

Date of Award

2001

Degree Name

Doctor of Philosophy

Department

Aerospace Engineering

First Advisor

Lester W. Schmerr, Jr.

Abstract

An ultrasonic nondestructive evaluation (NDE) measurement system is a complex collection of many elements such as the pulser/receiver, the cabling, the transducers, and the material configuration being tested. To completely model an ultrasonic measurement system, a system model, called the electroacoustic measurement (EAM) model , was developed. This model allows one to analyze the measurement system at many different levels, ranging from individual details to the entire system itself. The EAM model has been implemented in software using the MATLAB development environment such that one has control over the specification of the detailed system components. On the other hand, the practical use of the EAM model for commercial systems, whose explicit internal construction details are not known, requires that the model be expressed in terms of elements that can either be obtained experimentally or modeled. Thus, the EAM model has also been characterized in terms of a small number of system parameters that can either be explicitly modeled or obtained from purely electrical measurements. This advance is important, since it lays the foundation for new, quantitative transducer characterization procedures and new methods for evaluating and compensating for system variabilities.

DOI

https://doi.org/10.31274/rtd-180813-12426

Publisher

Digital Repository @ Iowa State University, http://lib.dr.iastate.edu

Copyright Owner

Changjiu Dang

Language

en

Proquest ID

AAI3003235

File Format

application/pdf

File Size

260 pages

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