Interpreting wave propagation in a homogeneous, isotropic, steel cylinder

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dc.contributor.authorStoyko, Darryl Keith
dc.contributor.examiningcommitteeShah, Arvind (Civil Engineering) Balakrishnan, Subramaniam (Mechanical and Manufacturing Engineering)en
dc.contributor.supervisorPopplewell, Neil (Mechanical and Manufacturing)en
dc.date.accessioned2005-01-12T16:43:43Z
dc.date.available2005-01-12T16:43:43Z
dc.date.issued2005-01-12T16:43:43Z
dc.degree.disciplineMechanical and Manufacturing Engineeringen_US
dc.degree.levelMaster of Science (M.Sc.)en_US
dc.description.abstractThe majority of commercially available ultrasonic transducers used to excite and measure wave propagation in structures can be coupled only to a free surface. While convenient, this method is likely to excite multiple structural modes, making data interpretation difficult. Furthermore, the many modes excited make predicting the structure’s response a computationally intensive task. Here the dynamic radial displacement induced by a transient radial point load is calculated at more than 230,000 points on the outer surface of a virgin steel pipe to simulate a typical experiment. The radial component of the displacement field is calculated by convolving the Green’s functions of the pipe with the transient load. These functions are calculated on personal computers (in a distributed arrangement) by employing modal summation. The mode shapes are obtained from a Semi-Analytical Finite Element formulation used in conjunction with a separation of variables. The results are presented in a four dimensional animation, providing easier interpretations and insight into how to best select observation points for the detection of defects. The accuracy of the calculated displacements is verified experimentally. Agreement is good when magnitude and phase corrections are incorporated from the frequency response curves of the transducers used.en
dc.description.noteFebruary 2005en
dc.format.extent20524041 bytes
dc.format.mimetypeapplication/pdf
dc.identifier.urihttp://hdl.handle.net/1993/97
dc.language.isoengen_US
dc.rightsopen accessen_US
dc.subjectGreen’s functionsen
dc.subjectUltrasonicen
dc.subjectWave propagationen
dc.subjectSemi-Analytical Finite Elementen
dc.subjectCylinderen
dc.subjectPipeen
dc.titleInterpreting wave propagation in a homogeneous, isotropic, steel cylinderen
dc.typemaster thesisen_US
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