Abstract
Nonlinear bistable systems have proven to be advantageous for energy harvesting of random and real ambient vibrations. One simple way of implementing a bistable transducer is setting a piezoelectric beam in a post-buckled configuration by axial compression. Besides, hinged or clamped-clamped type of boundary conditions correspond to two different post-buckled shape functions. Here we study, through theoretical analysis and numerical simulations, the efficiency of a hinged and clamped-clamped piezoelectric bridge under band-limited random noise with progressive axial load. Clamped configuration results to harvest 26% more power than hinged around an optimal axial load of 0.05%, while, in the intra-well trapped situation, above 0.1%, the two configurations present no substantial difference. Nevertheless, simulations confirm the advantage of exploiting inter-well oscillations in bistable regime.
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Cottone, F., Mattarelli, M., Vocca, H. et al. Effect of boundary conditions on piezoelectric buckled beams for vibrational noise harvesting. Eur. Phys. J. Spec. Top. 224, 2855–2866 (2015). https://doi.org/10.1140/epjst/e2015-02593-5
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DOI: https://doi.org/10.1140/epjst/e2015-02593-5