Frequency response function identification using fused filament fabrication-3D-printed embedded ArUco markers

Abstract

The assessment of modal components is a fundamental step in structural dynamics. While experimental investigations are generally performed through full-contact techniques, using accelerometers or modal hammers, this research proposes a non-contact Frequency Response Function identification measurement technique based on ArUco markers displacement detection. The proposed method is presented using a harmonically excited FFF 3D-printed flexible structure, equipped with multiple embedded-printed markers, whose displacement is measured with an industrial camera. Comparison with numerical simulation and an established experimental approach is finally provided for the results validation.

Introductory notes for the Acta IMEKO third issue 2022

“…The assessment of modal components is a fundamental step in structural dynamics. While experimental investigations are generally performed through full-contact techniques, using accelerometers or modal hammers, the research proposed in the paper entitled "Frequency response function identification using fused filament fabrication-3D-printed embedded ArUco markers" [13], by Lorenzo Capponi et al, presents a non-contact frequency response function identification measurement technique based on ArUco square fiducial markers displacement detection. A video of the phenomenon to be analyzed is acquired, and the displacement is measured through markers, using a dedicated tracking algorithm.…”