Damage detection in flexible propeller beam structures by exploiting impact-induced coupled acceleration signals

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dc.contributor.author Georgiou, IT en
dc.date.accessioned 2014-03-01T02:52:58Z
dc.date.available 2014-03-01T02:52:58Z
dc.date.issued 2011 en
dc.identifier.uri http://hdl.handle.net/123456789/36172
dc.relation.uri http://www.scopus.com/inward/record.url?eid=2-s2.0-84859531210&partnerID=40&md5=2f8a6c39126d8d906f45ecf86f3fa8a0 en
dc.subject.other Acceleration fields en
dc.subject.other Acceleration signals en
dc.subject.other Beam structures en
dc.subject.other Composite propellers en
dc.subject.other Coupled dynamics en
dc.subject.other Coupled response en
dc.subject.other Data-driven en
dc.subject.other Data-driven analysis en
dc.subject.other Distributed information en
dc.subject.other Local damage en
dc.subject.other Modal expansion analysis en
dc.subject.other Modal hammer en
dc.subject.other Non destructive en
dc.subject.other Proper orthogonal decompositions en
dc.subject.other Reduced order en
dc.subject.other Size and shape en
dc.subject.other Spatio-temporal en
dc.subject.other Damage detection en
dc.subject.other Dynamics en
dc.subject.other Flow fields en
dc.subject.other Intelligent materials en
dc.subject.other Intelligent systems en
dc.subject.other Principal component analysis en
dc.subject.other Propellers en
dc.title Damage detection in flexible propeller beam structures by exploiting impact-induced coupled acceleration signals en
heal.type conferenceItem en
heal.publicationDate 2011 en
heal.abstract A local damage at the tip of a composite propeller is diagnosed by properly comparing its impact-induced free coupled dynamics to that of a pristine wooden propeller of the same size and shape. This is accomplished by creating indirectly via collocated measurements distributed information for the coupled acceleration field of the propellers. The powerful data-driven modal expansion analysis delivered by the Proper Orthogonal Decomposition (POD) Transform reveals that ensembles of impact-induced collocated coupled experimental acceleration signals are underlined by a high level of spatio-temporal coherence. Thus they furnish a valuable spatio-temporal sample of coupled response induced by a point impulse. In view of this fact, a tri-axial sensor was placed on the propeller hub to collect collocated coupled acceleration signals induced via modal hammer nondestructive impacts and thus obtained a reduced order characterization of the coupled free dynamics. This experimental data-driven analysis reveals that the in-plane unit components of the POD modes for both propellers have similar shapes-nearly identical. For the damaged propeller this POD shape-difference is quite pronounced. The shapes of the POD modes are used to compute indices of difference reflecting directly damage. At the first POD energy level, the shape-difference indices of the damaged composite propeller are quite larger than those of the pristine wooden propeller. © 2011 by ASME. en
heal.journalName ASME 2011 Conference on Smart Materials, Adaptive Structures and Intelligent Systems, SMASIS 2011 en
dc.identifier.volume 2 en
dc.identifier.spage 455 en
dc.identifier.epage 463 en

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