BandeauWeb_IOMAC25V3.png

Advancements in structural dynamics characterization: the role of Video Motion Magnification in full-field Operational Deflection Shape characterization
Francesco Cosco  1, 2@  , Davide Mastrodicasa  1@  , Emilio Di Lorenzo  1@  , Domenico Mundo  2@  
1 : Siemens Industry Software NV
2 : Università della Calabria

Emerging optical techniques such as digital image correlation, optical flow, and video motion magnification (VMM) are revolutionizing the characterization of structural dynamics by enabling full-field data collection. These methods provide spatially dense sensory data, surpassing traditional point-based sensors like accelerometers, and serve as valuable inputs for operational modal analysis (OMA). VMM stands out as an effective standalone application for visualizing operational deflection shapes (ODSs) using a single camera. It demonstrates increased robustness against noise, although this comes with enhanced computational complexity due to the large volume of data generated. This study highlights VMM's potential in capturing power spectral density and ODSs of vibrating structures under various types of excitations, including acoustic, shaker, and environmental. This paper presents vibration measurements from different industrial structures, such as full-scale aircraft ground vibration testing (GVT) and full-scale satellite subjected to Direct Field Acoustic Testing (DFAN). Additionally, in this work, the challenges of data management are discussed and a strategy for achieving full-field VMM-based OMA is discussed.


Loading... Loading...