Multiparameter actuation of a neutrally-stable shell: a flexible gear-less motor

Abstract : We have designed and tested experimentally a morphing structure consisting of a neutrally stable thin cylindrical shell driven by a multiparameter piezoelectric actuation. The shell is obtained by plastically deforming an initially flat copper disk, so as to induce large isotropic and almost uniform inelastic curvatures. Following the plastic deformation, in a perfectly isotropic system, the shell is theoretically neutrally stable, owning a continuous manifold of stable cylindrical shapes corresponding to the rotation of the axis of maximal curvature. Small imperfections render the actual structure bistable, giving preferred orientations. A three-parameter piezoelectric actuation, exerted through micro-fiber-composite actuators, allows us to add a small perturbation to the plastic inelastic curvature and to control the direction of maximal curvature. This actuation law is designed through a geometrical analogy based on a fully non-linear inextensible uniform-curvature shell model. We report on the fabrication, identification, and experimental testing of a prototype and demonstrate the effectiveness of the piezoelectric actuators in controlling its shape. The resulting motion is an apparent rotation of the shell, controlled by the voltages as in a "gear-less motor", which is, in reality, a precession of the axis of principal curvature.
Liste complète des métadonnées

Littérature citée [34 références]  Voir  Masquer  Télécharger

http://hal.upmc.fr/hal-01570607
Contributeur : Corrado Maurini <>
Soumis le : lundi 31 juillet 2017 - 14:16:48
Dernière modification le : jeudi 11 janvier 2018 - 06:27:08

Fichier

1707.09013.pdf
Fichiers produits par l'(les) auteur(s)

Identifiants

  • HAL Id : hal-01570607, version 1
  • ARXIV : 1707.09013

Collections

Citation

Walid Hamouche, Corrado Maurini, Stefano Vidoli, Angela Vincenti. Multiparameter actuation of a neutrally-stable shell: a flexible gear-less motor. 2017. 〈hal-01570607〉

Partager

Métriques

Consultations de la notice

62

Téléchargements de fichiers

43