Abstract
This chapter reports simultaneous enhancement of the frequency bandgap of main structure and bandwidth of energy harvested in metamaterials-based finite structure via nonlinear attachments. The nonlinear attachments act as an attenuator as well as the harvester forms a unit cell. When subjected to excitations of various intensities, these nonlinear unit cells exhibit softening and hardening (functionally graded metastructure) nonlinear dynamics. This results in attenuation of resonant bandgaps at low amplitudes and attenuation due to wideband chaotic vibrations at large amplitudes. To demonstrate the concept, a linear spring mass chain with nonlinear attachments is analyzed numerically. The bandgap and bandwidth offered by the proposed structure are wider than those of the structure with linear resonant unit cells.
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