Digital image correlation for timing belts dynamic characterization: Potentials and critical aspects

Characterizing the dynamic behaviour of timing belt represents a challenge among the engineering community. Even though there exists several numerical methods to predict the dynamics of these systems, the tuning of such models by experimental approaches still represents an issue. Indeed, an accurate characterization does require a measurement in operative condition since the belt mounting condition might severely affect its dynamic behaviour. Moreover, since the belt is moving, non-contact measurement methods are needed. In such context, Laser Doppler Vibrometry (LDV) and imaging techniques do represent valid candidates for such purpose. This paper aims at describing the use of Digital Image Correlation (DIC) for the extraction of timing belts out-of-plane vibration and the recovery of Operational Deflection Shapes (ODSs). Results are compared with vibration data obtained by measuring on a moving belt with a standard LDV scanning, in step-scanning mode, over a grid points on the belt surface.