Uncertainty analysis in vibroacoustic panels with band gap

Autor(es)

Beli, D. ; Fabro, A. T. ; Ruzzene, M. ; Arruda, J. R. F. ; Sas, P ; Moens, D ; VanDeWalle, A

• Tipo de documento: Artigo Científico
• Fonte: PROCEEDINGS OF ISMA2016 INTERNATIONAL CONFERENCE ON NOISE AND VIBRATION ENGINEERING AND USD2016 INTERNATIONAL CONFERENCE ON UNCERTAINTY IN STRUCTURAL DYNAMICS; v. N/A, p. 13-pg., 2016-01-01.

Resumo

Vibration and acoustic isolation by passive control methods have been extensively studied along the years. In a recent past, phononic crystals and acoustic metamaterials have also been employed for this purpose. These periodic structures present band gaps, which are used herein to reduce vibration and acoustic radiation of panels. However, variability in the manufacturing process causes material and geometry uncertainties that affect their band gap robustness and consequently their dynamic attenuation performance. In this work, the robustness of the band gap phenomenon in vibroacoustic panels is investigated by employing the WFE method together to WKB approximation and KL expansion. A two-dimensional analysis where the panel is represented by either a phononic undulated beam or a metamaterial straight beam with distributed resonators is performed. Spatial correlated variability of the elastic modulus and resonator stiffness is considered. Band gap of both panels are shown to be robust with respect to this variability. However, vibration and acoustic attenuation are reduced. (AU)

• Processo FAPESP: 15/15718-0 - Comportamento Dinâmico de Metamateriais do Tipo Viga e Placa com Interação Fluido-Estrutura
• Beneficiário: Danilo Beli
• Modalidade de apoio: Bolsas no Exterior - Estágio de Pesquisa - Doutorado
• Processo FAPESP: 14/19054-6 - Modelagem de estruturas periódicas com aplicações a cristais fonônicos e metamateriais acústicos
• Beneficiário: Danilo Beli
• Modalidade de apoio: Bolsas no Brasil - Doutorado