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Communication Dans Un Congrès Année : 2020

Vibration force identification by high-speed digital holography

Résumé

High-speed digital holography is a contactless optical method which yields observation and measurement of vibration phenomena over a large field of view. By this technique, the displacement field of the studied structure is obtained with the measurement of the Doppler phase extracted in digital holograms that are recorded using a high-speed camera. Simultaneous measurements of about 50000 data points at the surface of the structure can be obtained at 100 kHz frame rate. Thanks to the full-field approach, the observation of stationary and transient vibrations can also be made in both their spatial and temporal domains. In this paper, we propose to apply the digital holographic method to the force identification in mechanical structures when submitted to different excitation regimes. The dense mesh of data points can be advantageously used to solve the inverse problem of force identification. In this paper, the inverse problem is based on the Force Analysis Technique (FAT) where the displacement field from digital holography is used as input in the equation of motion of the plate. Since the FAT requires regularization, it is here approached thanks to a low-pass-wavenumber filtering. The paper briefly presents the basic fundamentals of high-speed digital holography and the principle of FAT. Then, we demonstrate successful applications with both stationary vibrations and transient vibrations of a plate submitted to mechanical shaking. Sensitivity to noise measurements is discussed. We highlight the new opportunities for studying complex physical phenomena that can only be investigated with our proposed approach: the observation and measurement of non-stationary waves in transient regime like rolling ball, impact, friction and/or vibration induced by flow are discussed.
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Dates et versions

hal-03235491 , version 1 (27-05-2021)

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Erwan Meteyer, Pascal Picart, Charles Pezerat. Vibration force identification by high-speed digital holography. Forum Acusticum, Dec 2020, Lyon, France. pp.585-586, ⟨10.48465/fa.2020.0966⟩. ⟨hal-03235491⟩
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