Inducing dispersion curves with negative ...
Document type :
Communication dans un congrès avec actes
DOI :
Title :
Inducing dispersion curves with negative group velocity in inertially amplified phononic crystals through the application of an external state of prestress
Author(s) :
Miniaci, M. [Auteur]
Acoustique - IEMN [ACOUSTIQUE - IEMN]
Mazzotti, M. [Auteur]
Department of Mechanical Engineering [Boulder]
Amendola, A. [Auteur]
University of Salerno [UNISA]
Fraternali, F. [Auteur]
University of Salerno [UNISA]
Acoustique - IEMN [ACOUSTIQUE - IEMN]
Mazzotti, M. [Auteur]
Department of Mechanical Engineering [Boulder]
Amendola, A. [Auteur]
University of Salerno [UNISA]
Fraternali, F. [Auteur]
University of Salerno [UNISA]
Conference title :
XI International Conference on Structural Dynamic, EURODYN 2020
City :
Athens
Country :
Grèce
Start date of the conference :
2020-11-23
Book title :
XI International Conference on Structural Dynamic, EURODYN 2020
Journal title :
EASD Procedia
Publication date :
2020
English keyword(s) :
Phononic Crystals and Metamaterials
Prestress / Prestrain
Band Diagram Tunability
Inertial Amplification Mechanism
Prestress / Prestrain
Band Diagram Tunability
Inertial Amplification Mechanism
HAL domain(s) :
Sciences de l'ingénieur [physics]
English abstract : [en]
In this paper, we report about the effect of the application of a state of prestress on the band structure of a periodic phononic crystal characterized by an inertial amplification mechanism. Through a numerical example, ...
Show more >In this paper, we report about the effect of the application of a state of prestress on the band structure of a periodic phononic crystal characterized by an inertial amplification mechanism. Through a numerical example, we show the possibility of inducing negative group velocity in an isolated branch of the dispersion diagram. A 2-step Updated Lagrangian scheme is adopted to calculate the dispersion diagram of the structure. The proposed method include (i) the static geometrically nonlinear analysis of a representative unit cell undergoing the action of an applied external load and (ii) the BlochFloquet decomposition applied to the linearized equations of the acousto-elasticity for the unit cell in the deformed configuration. The dispersion analysis is performed in terms of small amplitude motions superimposed on a deformed state, once the desired load has been applied.Show less >
Show more >In this paper, we report about the effect of the application of a state of prestress on the band structure of a periodic phononic crystal characterized by an inertial amplification mechanism. Through a numerical example, we show the possibility of inducing negative group velocity in an isolated branch of the dispersion diagram. A 2-step Updated Lagrangian scheme is adopted to calculate the dispersion diagram of the structure. The proposed method include (i) the static geometrically nonlinear analysis of a representative unit cell undergoing the action of an applied external load and (ii) the BlochFloquet decomposition applied to the linearized equations of the acousto-elasticity for the unit cell in the deformed configuration. The dispersion analysis is performed in terms of small amplitude motions superimposed on a deformed state, once the desired load has been applied.Show less >
Language :
Anglais
Peer reviewed article :
Oui
Audience :
Internationale
Popular science :
Non
Source :
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