Advanced optical measurement systems are nowadays at disposal for complex dynamic and modal tests on lightweight structures, each with its own advantages, drawbacks and preferred usage domains, in order to obtain highly spatially defined vibration patterns for many applications in vibration engineering and product development. This work aims at comparing the potential of three completely different technologies on a common target and test rig. SLDV, dynamic ESPI and hi-speed DIC are here deployed in a unique test on the estimation of FRFs with high spatial accuracy from a thin plate, which exhibits a broad band dynamics and high modal density in the common frequency domain where the techniques can find an operative intersection. The comparison of estimated FRFs and related quality features is detailed with notes on acquisition and processing techniques, in order to draw conclusions on the full field measurement approach and the specific gear. Assessing the successful Full Field FRF estimation stage turns to be the basic step in developing further analyses, like experimental full field modal analysis for enhanced reliability in modeshapes estimation, numerical model tuning and risk assessment in complex structures.
Comparative studies on Full Field FRFs estimation from competing optical instruments
ZANARINI, ALESSANDRO
2015
Abstract
Advanced optical measurement systems are nowadays at disposal for complex dynamic and modal tests on lightweight structures, each with its own advantages, drawbacks and preferred usage domains, in order to obtain highly spatially defined vibration patterns for many applications in vibration engineering and product development. This work aims at comparing the potential of three completely different technologies on a common target and test rig. SLDV, dynamic ESPI and hi-speed DIC are here deployed in a unique test on the estimation of FRFs with high spatial accuracy from a thin plate, which exhibits a broad band dynamics and high modal density in the common frequency domain where the techniques can find an operative intersection. The comparison of estimated FRFs and related quality features is detailed with notes on acquisition and processing techniques, in order to draw conclusions on the full field measurement approach and the specific gear. Assessing the successful Full Field FRF estimation stage turns to be the basic step in developing further analyses, like experimental full field modal analysis for enhanced reliability in modeshapes estimation, numerical model tuning and risk assessment in complex structures.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
