Eventos Anais de eventos
COBEM 2023
27th International Congress of Mechanical Engineering
On the dynamic behavior of a one-dimensional metamaterial possessing inertial amplification mechanism combined with negative stiffness absorbers
Submission Author:
Thiago de Paula Sales , SP
Co-Authors:
Vinícius Santos, Thiago de Paula Sales, Morvan Ouisse
Presenter: Vinícius Santos
doi://10.26678/ABCM.COBEM2023.COB2023-1068
Abstract
Various researchers have demonstrated that Bragg-scattering can be suitably exploited to engineer periodic structures which show bandgaps, i.e., frequency ranges in which wave propagation is not allowed. This strategy is unsuitable for controlling wave propagation for some low-frequency applications, since large unit cells become required. Alternatively, locally resonant periodic structures can be designed to possess bandgaps in any frequency range. Nevertheless, these structures may not be adequate for some practical applications, due to the need for heavy resonators with low static stiffness, compromising desirable structural features, such as lightweight. Inertial amplification mechanisms (IAMs) have been employed as promising alternatives to the aforementioned techniques because they naturally exhibit forbidden zones in lower and broader frequency ranges. Hence, one studies the dynamic behavior of a periodic structure whose unit cell possesses IAM coupled to local resonators with negative stiffness absorbers. The aim is to investigate if Bragg-scattering and local resonance can be exploited to improve forbidden zones. The Wave-based Finite Element Method is used to compute free and forced responses. Predictions based on the Bloch-Floquet theorem were validated through the transmissibility response of a finite metastructure, which further confirmed the remarkable wave attenuation performance of the considered system and the bandgap merging.
Keywords
metamaterial, inertial amplification mechanism, negative stiffness absorber, periodic structures, wave finite element method
