Mechanical circulator for elastic waves by using the nonreciprocity of flexible rotating rings

Autor(es)

Beli, Danilo ^[1] ; Silva, Priscilla Brandao ^[2] ; de Franca Arruda, Jose Roberto ^[1]

Afiliação do(s) autor(es)

^[1] Univ Estadual Campinas, Fac Mech Engn, Dept Computat Mech, Rua Mendeleyev 200, Cidade Univ Zeferino Vaz, BR-13083860 Campinas, SP - Brazil

^[2] Eindhoven Univ Technol, Dept Mech Engn, POB 513, NL-5600 MB Eindhoven - Netherlands

• Tipo de documento: Artigo Científico
• Fonte: MECHANICAL SYSTEMS AND SIGNAL PROCESSING; v. 98, p. 1077-1096, JAN 1 2018.
• Citações Web of Science: 5

Resumo

Circulators have a wide range of applications in wave manipulation. They provide a non reciprocal response by breaking the time-reversal symmetry. In the mechanical field, nonlinear isolators and ferromagnetic circulators can be used for this objective. However, they require high power and high volumes. Herein, a flexible rotating ring is used to break the time-reversal symmetry as a result of the combined effect of Coriolis acceleration and material damping. Complete asymmetry of oscillating and evanescent components of wavenumbers is achieved. The elastic ring produces a nonreciprocal response that is used to design a three port mechanical circulator. The rotational speed for maximum transmission in one port and isolation in the other one is determined using analytical equations. A spectral element formulation is used to compute the complex dispersion diagrams and the forced response. Waveguides that support longitudinal and flexural waves are investigated. In this case, the ring nonreciprocity is modulated by the waveguide reciprocal response and the transmission coefficients can be affected. The proposed device is compact, nonferromagnetic, and may open new directions for elastic wave manipulation. (C) 2017 Elsevier Ltd. All rights reserved. (AU)

• 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