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Webinar 29/4/26: Experimental identification of dynamic forces and bending stiffness using inverse methods based on optical deflectometry measurements

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Speaker: Nicolas Madinier, INRIA research centre, Rennes, France

Wed 29th April 2026 12:00 – 13:00 UK time. Online only via Microsoft Teams.

Abstract:

The Virtual Fields Method (VFM) and the Force Analysis Technique (FAT) are two vibratory inverse methods. These methods are used to identify the complex bending stiffness of a thin plate over a wide frequency range. A second application is the identification of dynamic forces applied to the structure. In order to be used, inverse methods require the measurement of the vibration field of the plate. In this study, this measurement is performed using optical deflectometry, a full-field measurement method. Full-field measurement methods are techniques that allow a measurement of the vibration field of the plate over a large number of points simultaneously.

During this presentation, in a first experimental study, FAT and the VFM will be used using optical deflectometry data in order to identify dynamic forces applied to a thin plate. Then, in a second part, the methods will be used to identify the bending stiffness of the plate. It will be shown that new FAT and VFM formalisms can be developed to allow better application of the methods when they are implemented to identify bending stiffness of the plate using deflectometry data. In a second experimental study, these new formalisms will be used to identify the bending stiffness of the plate over a wide frequency range.

Biography:

Photograph of Nicolas Madinier

Nicolas studied mechanical engineering at ECAM Lyon and then completed a master’s degree in aerospace engineering at the University of Sherbrooke, QC, Canada. After this, he began a joint PhD degree in 2021 between the “Centre de Recherche Acoustique Signal Humain” at the University of Sherbrooke, QC, Canada and the “Laboratoire Vibrations Acoustique” at INSA Lyon, France, under the supervision of Alain Berry, Quentin Leclère and Kerem Ege. He defended my thesis entitled ‘Vibratory characterisations of structures using inverse methods and full-field measurements’ in September 2024. He is currently a postdoctoral researcher at INRIA Rennes, France, and his work focuses on developing methods for identifying dispersion relations of periodic structures.