Published online by Cambridge University Press: 05 July 2014
Introduction
Computation plays a critical role in the development of any ultrasonic guided wave inspection system. Beyond hardware and software development, modeling analysis is essential for evaluating various designs and ultimately relates to making a good choice from the hundreds of test points available on the dispersion curves. The process is illustrated in Figure D.1.
First, phase and group velocity dispersion curves must be calculated for a particular waveguide structure being considered. Wave structure computation is also critical. This early part of the process is the analytical section. This part leads to a mode and frequency choice based on experience, further modeling of wave interactions with certain defects in specific structures, or an intuitive selection and evaluation.
The actuator design could be, for example, a normal or angle beam device, or a comb-type array. A piezoelectric, electromagnetic acoustic, magnetostrictive, laser, or controlled mechanical impact could be considered for closeness to other mode points in an attempt at mode isolation, or phase velocity spectrum influences from a source influence, or of course a center frequency and frequency spectrum. See Figures D.2 and D.3.
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