Advanced search
Start date
Betweenand

Uncertainty and its influence in the behavior of mechanical waveguides

Grant number: 19/00315-8
Support type:Scholarships in Brazil - Doctorate
Effective date (Start): May 01, 2019
Effective date (End): April 30, 2022
Field of knowledge:Engineering - Mechanical Engineering - Mechanics of Solids
Principal researcher:José Roberto de França Arruda
Grantee:Luiz Henrique Marra da Silva Ribeiro
Home Institution: Faculdade de Engenharia Mecânica (FEM). Universidade Estadual de Campinas (UNICAMP). Campinas , SP, Brazil

Abstract

Phononic crystals and metamaterials are artificial and periodic structures that have potential for applications in the industry, for example, as vibrations and noise isolation and attenuation. These effects can be obtained via local resonance, stop band phenomena (band gaps), or as results of topological modes, such as interface modes and edge modes. Traditionally, deterministic models are used to describe such phenomena. However, variations in the material properties, or in the structure dimensions, can generate uncertainties in these wave propagation phenomena that may be beneficial or disadvantageous to vibration and noise attenuation. These studies will be carried out for uniform and periodic one-dimensional structures (rods and beams) and two-dimensional (plain and composite flat plates). The modeling methods used for simple structures will be: the spectral element (SEM) and state space method using an impedance formulation in the form of one Riccati equation (SSR), and the wave expansion methods (PWE); and wave finite elements (WFE) for complex structures.Bayesian statistics will be used to quantify the uncertainties regarding band gap phenomena and topological modes in uniform waveguides, phononic crystals and metamaterials. Statistical theories will be incorporated into the modeling methodologies developed by the LVA-UNICAMP research team. Different methodologies found in the literature for modeling and propagation of uncertainties will be investigated. In particular, statistical tests will be performed to verify whether topological modes, as suggested in the literature, are indeed more robust than other wave propagation phenomena. (AU)

News published in Agência FAPESP Newsletter about the scholarship:
Articles published in other media outlets (0 total):
More itemsLess items
VEICULO: TITULO (DATA)
VEICULO: TITULO (DATA)

Please report errors in scientific publications list by writing to: cdi@fapesp.br.