Full-field modal identification using image moment descriptors (original) (raw)

2012

Abstract

The vibrational characteristics of structures may be determined experimenta lly by modal testing with piezoelectric accelerometers using well-established methods. However, the place ment of accelerometers is critical for complete vibration measurement and unwanted mass-loading effects ar introduced. Optical sensing technologies including Scanning Laser Doppler Vibrometry (SLDV), Digital Speckle Pattern Interferometry (DSPI) and Digital Image Correlation (DIC) make full-field non-contact vib ration measurement possible. There are numerous benefits of applying these types of optical measureme nt t chniques when measuring, for example, the vibration of rotating, high-temperature, exceedingly small or ligh tweight structures. However, SLDV measurements are vulnerable to rigid body motion and asynchronism wh ereas DSPI is only applicable to displacement measurement under resonant, free-free conditions a nd with limited vibration amplitude. Three dimensional DIC (3D DIC) is a stereophotog...

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