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Article Dans Une Revue Advanced Modeling and Simulation in Engineering Sciences Année : 2020

Measurement of 1-10 Hz 3D vibration modes with a CT-scanner

Résumé

A new in-situ vibration mode measurement method within a tomograph is proposed based on Projection-based Digital Volume Correlation techniques. Several projection angles are selected and a large number of radiographs of the vibrating sample are acquired at random instants with a small exposure time in order to 'freeze out' the displacement and avoid motion blurring. Based on an initial reconstruction acquired in a static configuration, the displacement field measurement is performed using a Proper Generalized Decomposition technique. All projections are analyzed as being due to a few vibration modes deforming the known reference volume. The different projections directions are related to each other assuming that the modal amplitude probability distribution functions are statistically similar. A synthetic test case, mock-up of a liver, is used to illustrate and validate the approach. In this case, 5 projections angles were chosen, 300 radiographs per angle, and the first three vibration modes could be recovered with a good accuracy.
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Dates et versions

hal-03312163 , version 1 (02-08-2021)

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Clément Jailin, Thomas Jailin, Stéphane Roux. Measurement of 1-10 Hz 3D vibration modes with a CT-scanner. Advanced Modeling and Simulation in Engineering Sciences, 2020, 7 (1), ⟨10.1186/s40323-020-00155-4⟩. ⟨hal-03312163⟩
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