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Optimum resistive loads for vibration-based electromagnetic energy harvesters with a stiffening nonlinearity

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Original languageEnglish
Pages (from-to)1757-1770
Number of pages14
JournalJournal of Intelligent Material Systems and Structures
Volume25
Issue number14
Early online date25 Feb 2014
DOIs
DateE-pub ahead of print - 25 Feb 2014
DatePublished (current) - 3 Sep 2014

Abstract

The exploitation of nonlinear behavior in vibration-based energy harvesters has received much attention over the last decade. One key motivation is that the presence of nonlinearities can potentially increase the bandwidth over which the excitation is amplified and therefore the efficiency of the device. In the literature, references to resonating energy harvesters featuring nonlinear oscillators are common. In the majority of the reported studies, the harvester powers purely resistive loads. Given the complex behavior of nonlinear energy harvesters, it is difficult to identify the optimum load for this kind of device. In this paper the aim is to find the optimal load for a nonlinear energy harvester in the case of purely resistive loads. This work considers the analysis of a nonlinear energy harvester with hardening compliance and electromagnetic transduction under the assumption of negligible inductance. It also introduces a methodology based on numerical continuation which can be used to find the optimum load for a fixed sinusoidal excitation.

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