Abstract
This chapter delineates the influence of stiffness-type nonlinearities on the transduction of vibratory energy harvesters (VEHs) under random excitations that can be approximated by a white Gaussian noise process. Both mono- and bistable Duffing-type harvesters are considered. The Fokker–Planck–Kolmogorov equation governing the evolution of the harvester’s transition probability density function is formulated and used to generate the moment differential equations governing the response statistics. The moment equations are then closed using a fourth-order cumulant-neglect closure scheme and solved for the relevant steady-state response statistics. The influence of the nonlinearity, time constant ratio (the ratio between the nominal period of the mechanical subsystem and the time constant of the harvesting circuit), and noise intensity on the mean square value of the electric output (voltage or current) and the average power is detailed. Results are then compared to those obtained by analytically solving the FPK equation for the linear resonant harvester. It is demonstrated that a Duffing-type monostable harvester can never outperform its linear counterpart. A bistable harvester, on the other hand, can outperform a linear harvester only when the time constant ratio is small and its potential energy function is optimized based on a known excitation intensity.
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Notes
- 1.
The assumption of white noise is not as restrictive as it may appear. If the bandwidth of the excitation is sufficiently larger than that of the harvester’s, then a random excitation can be safely considered to be white.
- 2.
The reader can refer to Renno et al. [41] for more details on the optimization of energy harvesters under sinusoidal deterministic excitations.
- 3.
Cumulants are used to provide a measure of correlation strength among different random variables [42].
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Acknowledgements
This material is based upon work supported by the National Science Foundation under CAREER Grant No. 1055419. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the author and do not necessarily reflect the views of the National Science Foundation.
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Daqaq, M.F. (2013). Role of Stiffness Nonlinearities in the Transduction of Energy Harvesters under White Gaussian Excitations. In: Elvin, N., Erturk, A. (eds) Advances in Energy Harvesting Methods. Springer, New York, NY. https://doi.org/10.1007/978-1-4614-5705-3_7
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