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Numerical and experimental investigation of the design of a piezoelectric de-icing system for small rotorcraft part 2/3 : investigation of transient vibration during frequency sweeps and pptimal piezoelectric actuator excitation

Villeneuve Éric, Volat Christophe et Ghinet Sebastian. (2020). Numerical and experimental investigation of the design of a piezoelectric de-icing system for small rotorcraft part 2/3 : investigation of transient vibration during frequency sweeps and pptimal piezoelectric actuator excitation. Aerospace, 7, (5), p. 49-69.

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URL officielle: https://dx.doi.org/doi:10.3390/aerospace7050049

Résumé

The objective of this research project is divided in four parts: (1) to design a piezoelectric actuator based de-icing system integrated to a flat plate experimental setup, develop a numerical model of the system and validate experimentally; (2) use the experimental setup to investigate actuator activation with frequency sweeps and transient vibration analysis; (3) add an ice layer to the numerical model, predict numerically stresses at ice breaking and validate experimentally; and (4) implement the concept to a blade structure for wind tunnel testing. This paper presents the second objective of this study, in which the experimental setup designed in the first phase of the project is used to study transient vibration occurring during frequency sweeps. Acceleration during different frequency sweeps was measured with an accelerometer on the flat plate setup. The results obtained showed that the vibration pattern was the same for the different sweep rate (in Hz/s) tested for a same sweep range. However, the amplitude of each resonant mode increased with a sweep rate decrease. Investigation of frequency sweeps performed around different resonant modes showed that as the frequency sweep rate tends towards zero, the amplitude of the mode tends toward the steady-state excitation amplitude value. Since no other transient effects were observed, this signifies that steady-state activation is the optimal excitation for a resonant mode. To validate this hypothesis, the flat plate was installed in a cold room where ice layers were accumulated. Frequency sweeps at high voltage were performed and a camera was used to record multiple pictures per second to determine the frequencies where breaking of the ice occur. Consequently, the resonant frequencies were determined from the transfer functions measured with the accelerometer versus the signal of excitation. Additional tests were performed in steady-state activation at those frequencies and the same breaking of the ice layer was obtained, resulting in the first ice breaking obtained in steady-state activation conditions as part of this research project. These results confirmed the conclusions obtained following the transient vibration investigation, but also demonstrated the drawbacks of steady-state activation, namely identifying resonant modes susceptible of creating ice breaking and locating with precision the frequencies of the modes, which change as the ice accumulates on the structure. Results also show that frequency sweeps, if designed properly, can be used as substitute to steady-state activation for the same results.

Type de document:Article publié dans une revue avec comité d'évaluation
Volume:7
Numéro:5
Pages:p. 49-69
Version évaluée par les pairs:Oui
Date:28 Avril 2020
Sujets:Sciences naturelles et génie > Génie
Sciences naturelles et génie > Génie > Génie des matériaux et génie métallurgique
Sciences naturelles et génie > Sciences appliquées
Département, module, service et unité de recherche:Départements et modules > Département des sciences appliquées > Module d'ingénierie
Unités de recherche > Centre international de recherche sur le givrage atmosphérique et l’ingénierie des réseaux électriques (CENGIVRE) > Laboratoire international des matériaux antigivres (LIMA)
Mots-clés:icing, rotorcraft, ice protection system, piezoelectric actuator, vibration, numerical model, experimental testing, givrage, giravion, système de protection contre le givre, actionneur piézoélectrique, vibration, modèle numérique, essais expérimentaux
Déposé le:23 juin 2021 14:00
Dernière modification:23 juin 2021 14:00
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