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Operational modal analysis has become the focus of much research attention in the last two decades. Instead of an artificial force, the ambient excitation is considered as white-noise input to the structure and modal properties are calculated only from measured responses. In terms of the measurement technique, full-field optical methods, for example: electronic speckle pattern interferometry and digital...
One approach to damage assessment in composite structures is to examine the strain field induced by service loads and compare the fields measured during maintenance with those observed in pristine or virgin components. Levels of damage that cause appreciable changes in the strain field observed in service are significant since it is very likely that they will cause premature failure and the measured...
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