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Designing Rainbow Metamaterials

Meng, H.; Chronopoulos, D.

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H. Meng

D. Chronopoulos


Nonperiodic metamaterials can have better vibration attenuation than periodic metamaterials with properly designed resonator distributions. In this study, we propose optimal design routes for rainbow metamaterials. The rainbow metamaterials are nonperiodic structures that are composed of ?-shaped beams as backbones and attached spatially varying cantilever-mass resonators. The main optimization objective is to obtain good vibration attenuation within frequency of interests. Frequency response functions of the rainbow metamaterials are first calculated by an analytical model that is built on the basis of the displacement transfer matrix method. Two optimization objective functions are developed with the maximum and average receptance values within a prescribed frequency range respectively. The mass of resonators acts as design variables. The objective functions are later solved by virtue of the Genetic Algorithm method. The optimized rainbow metamaterials show good vibration attenuation in the prescribed optimization frequency range.


Meng, H., & Chronopoulos, D. (2020). Designing Rainbow Metamaterials

Conference Name ICAMAME 2020: 14. International Conference on Aerospace, Mechanical, Automotive and Materials Engineering
Start Date Apr 23, 2020
End Date Apr 24, 2020
Acceptance Date Mar 31, 2020
Online Publication Date Apr 24, 2020
Publication Date Apr 24, 2020
Deposit Date Apr 6, 2020
Publicly Available Date Apr 24, 2020
Keywords Rainbow metamaterial; Optimization; Vibration attenuation; Ge- netic Algorithm
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