Operational modal analysis of a cantilever beam by phase-based sub-pixel motion estimated from experimental videos

C. Marinel; O. Losson; B. Mathon; J. Le Besnerais; L. Macaire

doi:10.1117/12.2692503

28 July 2023 Operational modal analysis of a cantilever beam by phase-based sub-pixel motion estimated from experimental videos

C. Marinel, O. Losson, B. Mathon, J. Le Besnerais, L. Macaire

Author Affiliations +

Proceedings Volume 12749, Sixteenth International Conference on Quality Control by Artificial Vision; 127490W (2023) https://doi.org/10.1117/12.2692503
Event: Sixteenth International Conference on Quality Control by Artificial Vision, 2023, Albi, France

Abstract

Vibration study, also called modal analysis, plays an important role in the structural health monitoring of mechanical structures. During the last decade, video-based modal analysis methods have emerged to provide dense vibration estimation using each pixel as a contactless sensor. Dense subpixel motion is estimated and is then processed by a modal analysis algorithm to extract the modal basis composed of natural frequencies, damping ratios, and mode shapes. This paper introduces a new single-subband phase-based method for subpixel motion estimation. It is compared with state-of-the-art motion estimation method on synthetic and experimental videos of a cantilever beam.

(2023) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

C. Marinel, O. Losson, B. Mathon, J. Le Besnerais, and L. Macaire "Operational modal analysis of a cantilever beam by phase-based sub-pixel motion estimated from experimental videos", Proc. SPIE 12749, Sixteenth International Conference on Quality Control by Artificial Vision, 127490W (28 July 2023); https://doi.org/10.1117/12.2692503

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KEYWORDS

Motion estimation

Video

Mode shapes

Modal analysis

Motion models

Spatial frequencies

Accelerometers

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