Abstract

Nonlinear harvesting devices have been shown to maintain large amplitude oscillations over a wider range of frequencies than their linear counter parts. Central to exploiting the dynamic behaviour for harvesting is the understanding of the cross-well oscillations which involve constant snap-through between the stable states of such systems. Yet the phenomena involving the dynamics of snap-through and their impact in the harvesting characteristics have not been studied in detail. In this paper, the relevant response characteristics for dynamically triggered snap-through of bi-stable composite laminates for energy harvesting are investigated. A nonlinear model for the dynamics of the bi-stable composites is used to study the relation between the properties of the laminate and the acceleration level required for causing snap-through. In particular, the effect of varying the induced stress level on the dynamic response is investigated. The obtained relations provide a tool for designing the excitation level for which broad-band response bi-stable systems is obtained, aiding the design of harvesting devices based on such structures.

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