Motion estimation of a cantilever beam in the quasi-static case based on the monogenic signal and the Lucas-Kanade optical flow - Université Jean-Monnet-Saint-Étienne Access content directly
Conference Papers Year : 2022

Motion estimation of a cantilever beam in the quasi-static case based on the monogenic signal and the Lucas-Kanade optical flow

Abstract

Who doesn't have a smartphone in their pocket? Today, there is a real interest in using video cameras for operational modal analysis or preventive maintenance applications instead of using traditional sensors such as accelerometers or strain gauges. Indeed, the video camera allows a contactless diagnosis, i.e. does not modify the properties of the observed structure and allows synchronous full-field measurement of displacement and strain, all with very few cables and equipment. The potential of video-based vibration monitoring is all the more attractive as it can be achieved through the use of any smartphone. The first aim of this work is to provide a comparison between two different methods of image processing and the results from a classical sensor which is the accelerometer. These methods allow a quick and simple follow-up of the beam's displacement field from the tracking of its contours with a high-speed camera. The other objective is to determine the conditions under which such good results can be obtained with a smartphone camera. To meet these multiple objectives, a comparison study is implemented on a test bench presenting a cantilever beam excited by a piezoelectric actuator and simultaneously observed by a high-speed camera and a smartphone. The processing of the videos is carried out two different methods. The quality of the obtained results is analyzed from a metrological and computational cost point of view and validated by standard accelerometer measurement. The proposed methodology is promising in the case of an embedded beam, and the adaptation of this method to more complex shapes than beams seems feasible as long as the detection of the contours can be done efficiently.
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Dates and versions

ujm-03952845 , version 1 (23-01-2023)

Identifiers

  • HAL Id : ujm-03952845 , version 1

Cite

Jimmy Touzet, Hugo André, Frédéric Bonnardot, Simon Chesné, Olivier Alata. Motion estimation of a cantilever beam in the quasi-static case based on the monogenic signal and the Lucas-Kanade optical flow. ISMA - Int. Conf. on Noise and Vibration Engineering, KU Leuven Mecha(tro)nic System Dynamics (LMSD) division, Sep 2022, Leuven (Belgium), France. ⟨ujm-03952845⟩
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