Eventos Anais de eventos
COBEM 2021
26th International Congress of Mechanical Engineering
An elastic metamaterial beam leveraging unevenly tuned locally resonating systems for vibration attenuation
Submission Author:
Vagner Candido de Sousa , SP
Co-Authors:
Vagner Candido de Sousa, Renan Trevizan de Melo, Carlos De Marqui Junior
Presenter: Vagner Candido de Sousa
doi://10.26678/ABCM.COBEM2021.COB2021-2234
Abstract
This research presents an analysis about elastic metamaterials with unevenly tuned locally resonant systems, in an effort to promote vibration attenuation with no addition of extra mass to the host structure. For this purpose, the equations of motion for a five-resonator metamaterial beam under harmonic base excitation were solved in frequency domain for a range of excitation frequencies. Transmissibility plots were obtained so that a number of different case studies could be compared with a reference case (uniform configuration). The most attractive case studies show that when certain resonators (identified here as #3 and #5) have their masses decreased by 30% the bandgap bandwidth increases by 21.95%. Moreover, when an expressive mass reduction of 41% in resonator #4 was also considered, the bandgap increased by 35%. Additional modifications on the resonators #1 and #2 promoted improvements of 85.45% on the bandgap bandwidth when their target frequencies have been decreased by 36% and 19%, respectively (achieved by decreasing the corresponding spring stiffness). Therefore, we may conclude that carefully tuned non-uniform resonators can significantly improve the model response (in terms of bandgap bandwidth) and reduce the mass added by the resonators.
Keywords
Locally resonant metamaterials, Vibrations
