Abstract
We show efficient elastic energy transfer and wave confinement through a graded array of resonators attached to an elastic beam. Experiments demonstrate that flexural resonators of increasing lengths allow to reduce wave scattering and to achieve the rainbow effect with local wavefield amplifications. We show that the definition of a monotonically decreasing distribution of the natural frequencies of the resonators along the wave propagation direction, is the preferable choice to increase the energy efficiency of the system. The proposed configuration is suitable for micro-fabrication, envisaging practical applications for micro-scale vibration energy harvesting.
Highlights
The study of novel metamaterial devices has attracted growing interest within the research community working in several fields of physics, such as electromagnetism (Pendry et al, 1999; Pendry, 2000) acoustics (Liu et al, 2000; Craster and Guenneau, 2013) and elasticity (Craster and Guenneau, 2017), amongst others
We show that a monotonically decreasing distribution of the natural frequencies of the resonators yields stronger wavefield amplifications, which reflect on enhanced energy harvesting performance
The array capability of slowing down waves enables a strong energy transfer to the resonators, which reflects in enhanced energy harvesting performances
Summary
The study of novel metamaterial devices has attracted growing interest within the research community working in several fields of physics, such as electromagnetism (Pendry et al, 1999; Pendry, 2000) acoustics (Liu et al, 2000; Craster and Guenneau, 2013) and elasticity (Craster and Guenneau, 2017), amongst others. Particular advances have been recently reported in elastic devices made of arrays of resonant rods for deep elastic substrates (Colombi et al, 2016b; Colombi et al, 2017; Colquitt et al, 2017; Chaplain et al, 2020a) to mode convert Rayleigh (R) into Shear (S) or Pressure (P) waves Such graded line arrays of resonators have been theorised, designed and manufactured for energy harvesting applications (Chaplain et al, 2020b; De Ponti et al, 2020; Alshaqaq and Erturk, 2021; De Ponti, 2021). We show that a monotonically decreasing distribution of the natural frequencies of the resonators yields stronger wavefield amplifications, which reflect on enhanced energy harvesting performance
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