Ultrasonic simulation and measurements with cut-off frequency extractions |
Posted on:2014-09-19 | Degree:M.Sc | Type:Thesis |
University:University of Manitoba (Canada) | Candidate:Adeogun, Kazeem | Full Text:PDF |
GTID:2452390008954608 | Subject:Engineering |
Abstract/Summary: | |
The removal of the effect of imperfect dynamic properties of ultrasonic transducers and associated electronics, as well as the couplant to a structure, from experimental data is presented. The investigation reveals that it is unnecessary for the instrumentation to have an ideal frequency response function for a transducer because imperfect measurement behaviour can be removed with post processing. A computer simulation of a homogeneous, isotropic pipe's radial displacement is shown to agree closely with a corresponding measurement if a reasonably accurate frequency response function of the measurement chain is incorporated.;A procedure to extract the cut-off frequencies of an unblemished pipe and the singularity frequencies of a notched pipe is developed. Frequency differences between the cut-off frequencies and the nearest frequencies of singularities introduced by a circumferential notch are investigated. It is confirmed experimentally that singularities are introduced by a notch and differences are measurable at a 95% confidence level. |
Keywords/Search Tags: | Frequency, Cut-off, Measurement |
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