Abstract
This study proposes to carry out the experimental modal analysis of nonlinear systems under the assumption of almost invariant modal shapes by coupling video analysis from a high speed/resolution camera and extended Kalman filtering. A clamped-clamped beam with a local nonlinearity is considered, and its vibrations are measured by detecting and tracking a large set of (virtual) sensors bonded to the beam outer surface. Specific image processing and video tracking techniques are employed and detailed herein. Then, the instantaneous natural frequencies and modal amplitudes are identified by means of a data assimilation method based on extended Kalman and modal filters. Finally, the proposed method of identification is assessed using a numerical example possessing 3 degrees of freedom and a strong nonlinearity. The performance and limits of the identification process are discussed.
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Data Availability
The datasets generated during and/or analysed during the current study are available from the corresponding author on reasonable request.
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Acknowledgements
We thank Tilàn Dossogne (University of Liège) and Reza Babajanivalashedi (ISAE-Supméca) for their time and help during the experimental campaign.
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Lo Feudo, S., Dion, JL., Renaud, F. et al. Video analysis of nonlinear systems with extended Kalman filtering for modal identification. Nonlinear Dyn 111, 13263–13277 (2023). https://doi.org/10.1007/s11071-023-08560-1
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DOI: https://doi.org/10.1007/s11071-023-08560-1