| Texto completo | |
| Autor(es): |
Salsa Junior, Rubens Goncalves
;
Sales, Thiago de Paula
;
Rade, Domingos Alves
Número total de Autores: 3
|
| Tipo de documento: | Artigo Científico |
| Fonte: | LATIN AMERICAN JOURNAL OF SOLIDS AND STRUCTURES; v. 20, n. 6, p. 20-pg., 2023-01-01. |
| Resumo | |
Recent research on structural dynamics has steered towards elastic metamaterials, as band gap phenomena can be explored to mitigate vibration. A challenge in their design is the determination of configurations resulting in wider band gaps in lower frequency ranges. Since some level of damping is unavoidable in any real engineering structure, it is necessary to extend the current methodology of optimal design to provide a deeper understanding of how damping may affect the desired performance. Therefore, the main objective of this article is to propose and evaluate a numerical procedure for the optimization of band gaps in damped metamaterials. Specifically, a modified objective function that incorporates an evanescence index integral is used and two optimization schemes are implemented, each reflecting whether the structure is undamped or damped. It is shown that the optimal damped metamaterial has wider range of attenuation than the undamped optimal one, but with decreased attenuation levels. The optimization procedure is validated numerically for a finite structure, demonstrating reduced transmissibility of wave motions. (AU) | |
| Processo FAPESP: | 20/06022-0 - Projeto e avaliação de estruturas piezoelétricas periódicas para controle de ruído e vibração de painéis |
| Beneficiário: | Rubens Gonçalves Salsa Junior |
| Modalidade de apoio: | Bolsas no Brasil - Pós-Doutorado |
| Processo FAPESP: | 18/15894-0 - Projeto e otimização de estruturas periódicas para aprimoramento de desempenho vibroacústico |
| Beneficiário: | Carlos de Marqui Junior |
| Modalidade de apoio: | Auxílio à Pesquisa - Temático |