The effect of Duffing-type non-linearities and Coulomb damping on the response of an energy harvester to random excitations



Green, Peter L, Worden, Keith, Atallah, Kais and Sims, Neil D
(2012) The effect of Duffing-type non-linearities and Coulomb damping on the response of an energy harvester to random excitations. Journal of Intelligent Material Systems and Structures, 23 (18). pp. 2039-2054.

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Abstract

<jats:p> Linear energy harvesters can only produce useful amounts of power when excited close to their natural frequency. Due to the uncertain nature of ambient vibrations, it has been hypothesised that such devices will perform poorly in real-world applications. To improve performance, it has been suggested that the introduction of non-linearities into such devices may extend the bandwidth over which they perform effectively. In this study, a magnetic levitation device with non-linearities similar to the Duffing oscillator is considered. The governing equations of the device are formed in which the effects of friction are considered. Analytical solutions are used to explore the effect that friction can have on the system when it is under harmonic excitations. Following this, a numerical model is formed. A differential evolution algorithm is used alongside experimental data to identify the relevant parameters of the device. The model is then validated using experimental data. Monte Carlo simulations are then used to analyse the effect of coulomb damping and Duffing-type non-linearities when the device is subjected to broadband white noise and coloured noise excitations. </jats:p>

Item Type: Article
Uncontrolled Keywords: 7 Affordable and Clean Energy
Depositing User: Symplectic Admin
Date Deposited: 21 Apr 2016 11:16
Last Modified: 15 Mar 2024 07:09
DOI: 10.1177/1045389x12446520
Related URLs:
URI: https://livrepository.liverpool.ac.uk/id/eprint/3000664