Six degrees of freedom measurement with continuous scanning laser Doppler vibrometer

Academic Article
Publication Date:
2013
abstract:
The dynamicresponseofastructurecanconsistofuptosixdegreesoffreedom(DOF).
Not allofthemmaybepresentatalltimesinastructure,butforadetailedfinite
elementmodelvalidationitisimportanttoprovideasmuchinformationaspossible.
CurrentcontacttransducerscanpickupacombinationofsomeofthementionedDOFs,
but arenotabletoprovideallsixDOFsfromasingletransducer.Severalcontact-less
transducers,suchasaScanningLaserDopplerVibrometer(SLDV),canbecombinedtoa
single measurementsystemthatallowsthedeterminationofuptothreetranslational
degreesoffreedomatapoint,buttheyarestillnotprovidingrotationalinformationas
the laserbeamisfixedtoapoint.ContinuouslyScanningLaserDopplerVibrometer
(CSLDV)methodscanpartlyovercomethisissuebytravellinginsmallcirclesaroundthe
measurementlocationandthusalsosensingtherotationaroundthethreeaxesata
point.AnintroductionofCSLDVmethodsformeasuringDOFsatapointisgiven,
focussingonamethodforcapturingupto5DOFsusingalens.However,thelenscan
make themeasurementofthein-planerotationverydifficultandimpractical.Thispaper
presentsanewtypeofscanningdevicewhichallowsmeasuringallsixdegreesof
freedomatameasurementlocationwithasinglesetupandasinglepointLDV,by
combiningvariablesmallcirclescans.Experimentalvalidationofthescanningheadis
presentedandthemeasurementofthelastDOF,thein-planerotation,isdemonstrated.
Iris type:
1.1 Articolo in rivista
List of contributors:
Authors of the University:
Handle:
https://iris.uniecampus.it/handle/11389/203
Published in:
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
Journal