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.
Six degrees of freedom measurement with continuous scanning laser Doppler vibrometer
MARTARELLI, MILENA;
2013-01-01
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.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
