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.
| Identifer | oai:union.ndltd.org:LACETR/oai:collectionscanada.gc.ca:MWU.1993/14398 |
| Date | 04 January 2013 |
| Creators | ADEOGUN, KAZEEM |
| Contributors | Popplewell, Neil (MECHANICAL ENGINEERING) Bai, Hao (MECHANICAL ENGINEERING), Birouk, Madjid (MECHANICAL ENGINEERING) Shalaby, Ahmed (CIVIL ENGINEERING) |
| Source Sets | Library and Archives Canada ETDs Repository / Centre d'archives des thèses électroniques de Bibliothèque et Archives Canada |
| Detected Language | English |
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