Time-domain flexural wave intensity measurement in beams at high frequencies

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dc.contributor.author Halkyard, Crispin en
dc.contributor.author Masson, P en
dc.contributor.editor Mace, Brian en
dc.contributor.editor Ferguson, Neil en
dc.contributor.editor Rustighi, Emiliano en
dc.coverage.spatial Oxford, UK en
dc.date.accessioned 2012-04-11T21:40:51Z en
dc.date.issued 2009 en
dc.identifier.citation NOVEM 2009 - Noise and Vibration: Emerging Methods, Oxford, UK, 05 Apr 2009 - 08 Apr 2009. en
dc.identifier.uri http://hdl.handle.net/2292/17066 en
dc.description.abstract A method for obtaining real-time estimates of flexural wave energy flow (or intensity) in beams at high frequencies is presented, targeted at structural health monitoring applications. Beam response and energy flow are expressed within the framework of Timoshenko beam theory, and the significance of the presence of a second propagating wave type at high frequencies is discussed. Digital filtering of the outputs of a sensor array, based on wave decomposition theory, to obtain estimates of the velocity, rotational velocity, bending moment and shear force is proposed. These parameters are then combined to yield an estimate of structural intensity The design of the necessary digital filters is discussed, and the results of simulations and experimental measurements are presented. It is shown that the approach is applicable to frequencies both below and above the ,cut-on, of the second propagating wave type. In particular, it is shown that the approach makes it possible to discriminate between the two wave types, based on differing contributions of the shear force and the bending moment to the vibrational energy flow. This has potentially significant implications for structural health monitoring applications, as it allows the differing characteristics of these wave types to be exploited for improved defect location. en
dc.publisher The Authors en
dc.relation.ispartof NOVEM 2009 - Noise and Vibration: Emerging Methods en
dc.relation.ispartofseries Proceedings of NOVEM 2009 en
dc.rights Items in ResearchSpace are protected by copyright, with all rights reserved, unless otherwise indicated. Previously published items are made available in accordance with the copyright policy of the publisher. en
dc.rights.uri https://researchspace.auckland.ac.nz/docs/uoa-docs/rights.htm en
dc.title Time-domain flexural wave intensity measurement in beams at high frequencies en
dc.type Conference Item en
pubs.begin-page 098-1 en
dc.rights.holder Copyright: The Authors en
pubs.author-url http://www.midfrequency.org/events/novem-2009-noise-and-vibration-emerging-methods en
pubs.end-page 098-12 en
pubs.finish-date 2009-04-08 en
pubs.start-date 2009-04-05 en
dc.rights.accessrights http://purl.org/eprint/accessRights/RestrictedAccess en
pubs.subtype Proceedings en
pubs.elements-id 93299 en
pubs.record-created-at-source-date 2010-09-01 en

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