Eventos Anais de eventos
COBEM 2021
26th International Congress of Mechanical Engineering
OPTIMIZATION OF VIBRATION BANDGAPS IN THREE-DIMENSIONAL LATTICE STRUCTURES
Submission Author:
Rubens Gonçalves Salsa Junior , RN
Co-Authors:
Rubens Gonçalves Salsa Junior, Thiago de Paula Sales, Domingos Rade
Presenter: Rubens Gonçalves Salsa Junior
doi://10.26678/ABCM.COBEM2021.COB2021-1019
Abstract
Recent research on structural dynamics has steered towards periodic structures, as band gap phenomena can be explored to mitigate vibration. The main objective of this work is to tackle the optimal design of three-dimensional lattice structures which show one-dimensional periodicity, and incorporate localized resonators to provide band gaps. The unit-cell of the structure was modelled by the Finite Element Method, while band gaps were identified by inspecting the associated dispersion relation, obtained by taking into account Floquet-Bloch boundary conditions. The dependence of the band gaps of the investigated lattice structure on design parameters was duly analyzed. Lastly, the frequency range of band gaps was broadened by casting an optimization problem, which was solved using the differential evolution algorithm. It is shown that the optimized lattice periodic structure can decrease the transmissibility of mechanical waves over a wide range of frequencies, demonstrating its potential utility in diverse applications requiring vibration suppression.
Keywords
Phononic Crystals, resonant metamaterials, Optimization, Vibration control, band gaps
