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Article Dans Une Revue Journal of Sound and Vibration Année : 2022

Towards a remote inspection of jet engine blades using time reversal

Résumé

Assessing the state of damage of jet engine blades is a burning issue in aeronautics. However, most nondestructive evaluation procedures require cumbersome installations and removal of the blades from the engines, which is time and money consuming. We present a non-intrusive acoustic monitoring technique that could be applied for fast remote inspection of selected blades inside a jet engine. The technique uses a time reversal mirror in the audible frequency range to selectively excite a targeted blade a few meters away. The resonance frequencies of the blade are measured at the location of the excitation using a laser vibrometer. The technique is first applied on a few individual blades and then inside a jet engine. Selective excitation of a difficult-to-access blade among others inside a cavity is shown. In laboratory, some damage (material removal or slit) is created on a set of initially intact blades, which cause a shift in their resonance frequencies. By evaluating these frequency shifts, we are able to remotely detect millimeter size damage on the blades. Finally, the on-site applicability and the uncertainties of the method are discussed.
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hal-03662886 , version 1 (22-07-2024)

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Maxime Farin, Claire Prada, Tony Lhommeau, Mohammed El Badaoui, Julien de Rosny. Towards a remote inspection of jet engine blades using time reversal. Journal of Sound and Vibration, 2022, 525, pp.116781. ⟨10.1016/j.jsv.2022.116781⟩. ⟨hal-03662886⟩
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