Application of digital image correlation in operational modal analysis of rotating structures

Conventional methods for Operational Modal Analysis (OMA) typically involve the placement of stationary probes, such as accelerometers, to measure the vibration modes of structures. However, the use of Digital Image Correlation (DIC) for OMA offers the advantage of being a non-contact, full-field measurement technique. This approach is particularly advantageous for rotating machines, as it eliminates the effects of adding sensor masses to the structure and data transmission problems. This work addresses the challenges associated with applying the DIC technique to vibration analysis on rotating components and proposes a new methodology for Rigid Body Motion (RBM) compensation. This methodology addresses the complexities in the analysis of rotating structures, ensuring accurate results. The effectiveness of the proposed methodology is demonstrated through its application in the experimental analysis of the impulse response of a rotating rectangular plate using high-speed cameras and DIC technique.