Optimal design of rainbow metamaterials

Meng, Han, Chronopoulos, Dimitrios, Fabro, Adriano, Elmadih, Waiel and Leach, Richard (2020) Optimal design of rainbow metamaterials. In: MEDYNA2020, 3rd Euro-Mediterranean Conference on Structural Dynamics and Vibroacoustics. UNSPECIFIED.

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Abstract

Nonperiodic metamaterials with appropriately designed resonator distributions can have superior vibration attenuation capabilities compared to periodic metamaterials. In this study, we present an optimization scheme for the resonator distribution in rainbow metamaterials that are constitutive of a Π-shaped beam with parallel plate insertions and spatially varying cantilever-mass resonators. To improve the vibration attenuation of rainbow metamaterials at specific design frequencies, two optimization strategies are proposed, aiming at minimizing the maximum and average receptance values. Objective functions are set up with the frequency response functions predicted by the displacement transfer matrix model. The masses of the two sets of resonators, clamped at different side walls of the Π-shaped beams, constitute the set of design variables. Optimization functions are solved using a genetic algorithm method. Results of case studies showed that the receptance values of the nonperiodic metamaterial is greatly reduced within the optimization frequency range, in comparison to the periodic metamaterial.

Item Type: Book Section
Additional Information: 3rd Euro-Mediterranean Conference on Structural Dynamics and Vibroacoustics : jointly organized with AIDAA - Italian Association of Aeronautics and Astronautics , MEDYNA2020 ; Conference date: 17-02-2020 Through 19-02-2020
Subjects: H100 General Engineering
H900 Others in Engineering
Department: Faculties > Engineering and Environment > Mechanical and Construction Engineering
Depositing User: Rachel Branson
Date Deposited: 18 Aug 2020 14:05
Last Modified: 18 Aug 2020 14:15
URI: http://nrl.northumbria.ac.uk/id/eprint/44122

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