Abstract : Blades vibrations must be measured in operations to validate blade design. Tip-timing is one of the classical measurement methods but its main drawback is the generation of sub-sampled and non-uniform sampled signals. This paper presents a new sparse method for tip-timing spectral analysis that makes use of engine rotation variations. Assuming that blade vibration signals yield to line spectra, a sparse signal model is introduced as a linear system. The solution to the problem is obtained by ADMM (Alternating Direction Method of Multipliers) with a ℓ 1-regularization. Results for simulated and real signals are given to illustrate the efficiency of this method. The main advantages of the proposed method are to provide a fast solution and to take into account the variations of the rotation speed. Results show that this approach reduces frequency aliasings caused by the low sampling frequency of the measured signals.
Type de document :
Communication dans un congrès
26rd European Signal Processing Conference (EUSIPCO), Sep 2018, Rome, Italy
https://hal-centralesupelec.archives-ouvertes.fr/hal-01896808
Contributeur : José Picheral
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Soumis le : mardi 16 octobre 2018 - 14:56:27
Dernière modification le : lundi 22 octobre 2018 - 08:36:04
Antoine Bouchain, José Picheral, Elisabeth Lahalle, Agathe Vercoutter, Arnaud Talon. Sparse Method for Tip-Timing Signals Analysis with Non Stationary Engine Rotation Frequency. 26rd European Signal Processing Conference (EUSIPCO), Sep 2018, Rome, Italy. 〈hal-01896808〉
