ETD

Archivio digitale delle tesi discusse presso l'Università di Pisa

Tesi etd-04252007-093226


Tipo di tesi
Tesi di laurea specialistica
Autore
Massei, Luca
Indirizzo email
massei.lu@tiscali.it
URN
etd-04252007-093226
Titolo
Misalignment problems for a continuous scanning Laser Doppler Vibrometer for cylindrical structures
Dipartimento
INGEGNERIA
Corso di studi
INGEGNERIA MECCANICA
Relatori
Relatore Prof. Ewins, David J.
Relatore Prof. Bertini, Leonardo
Relatore Prof. Beghini, Marco
Parole chiave
  • laser
  • misalignemnt
  • vibrometer
  • continuous scanning
  • model updating
Data inizio appello
13/06/2007
Consultabilità
Parziale
Data di rilascio
13/06/2047
Riassunto
This thesis has been developed at Imperial College, London. The aim is the definition of a model that evaluates the alignment of the components of a laser Doppler continuous scanning vibrometer in order to assess the tracking errors of the laser spot. A series of measurement tests on the system has been carried out to highlight the effect of misalignment of the system components on the measurement output. A geometrical model of the laser tracking error related to the orientation parameters of the system has been realised: the model has been checked with a CAD simulation and measurement tests on the structure. Moreover a sensitivity analysis has been performed to weight the tolerance limits for the alignment of the system components. The ideal path and the misaligned path are simulated over the finite elements model and compared using the “Modal Assurance Criterion” in order to state a threshold for the measurement accuracy that considers also the dynamic behaviour of the measured structure.
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