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

Georgiou, IT

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	https://dspace.lib.ntua.gr/xmlui/handle/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