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.
File in questo prodotto:
Non ci sono file associati a questo prodotto.

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11389/203
 Attenzione

Attenzione! I dati visualizzati non sono stati sottoposti a validazione da parte dell'ateneo

Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 28
  • ???jsp.display-item.citation.isi??? 26
social impact