4.6 Article

Optimal design of cubic nonlinear energy harvester device for random vibrations

Journal

PROBABILISTIC ENGINEERING MECHANICS
Volume 71, Issue -, Pages -

Publisher

ELSEVIER SCI LTD
DOI: 10.1016/j.probengmech.2022.103386

Keywords

Energy harvesting; Duffing-type nonlinearity; Ambient vibration; Threshold displacement; Optimisation

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Linear energy harvesters have a narrow frequency bandwidth and efficient operation relies on the excitation frequency close to the fundamental frequency. Nonlinearity in electromechanical devices is proposed to extend the bandwidth. This study optimizes a Duffing-type nonlinear energy harvester to reduce its size while maintaining power output.
Linear energy harvesters have a narrow frequency bandwidth and hence operate efficiently only when the excitation frequency is very close to the fundamental frequency of the harvester. Consequently, small variations of the excitation frequency around the harvester's fundamental frequency drop the energy output making the harvesting process inefficient. To extend the harvester's bandwidth, some recent solutions call for using electromechanical devices with stiffness-type nonlinearities. This work deals with the optimisation of the performance of a single degree-of-freedom electromagnetic energy harvester whose mechanical behaviour has a Duffing-type nonlinearity, as for suspended masses, to reduce the size of energy harvesting devices without affecting their power output. The vibration input is assumed as a broadband Gaussian white noise base acceleration. It is analytically shown that the optimum load resistance of the device is different to that which is dictated by the principle of impedance matching.

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