Switching damping for a frequency-tunable electromagnetic energy harvester

Ooi, B.L. and Gilbert, J.M. and Aziz, A.R.A. (2015) Switching damping for a frequency-tunable electromagnetic energy harvester. Sensors and Actuators, A: Physical, 234. pp. 311-320.

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Abstract

This paper demonstrates the possibility to widen the operational bandwidth of an electromagnetic energy harvester by switching the values of electrical damping coefficient at different points within the oscillating cycle. In this system, the damping in the system is electronically switched by adjusting the value of load resistance used. An analytical model of the switching damping device is presented in which it is shown that altering the damping can increase or decrease the duration of particular segment of the oscillation cycle and so, by selecting appropriate damping, the resonant frequency can be altered. The predictive results are then validated by series of experimental results for the proposed range of resistive load resistances. For the prototype considered, a frequency shift of +1 to -1.3 of the resonant frequency are achieved. However, this shifting of the resonant frequency does come with some loss of average output power, since this is highly susceptible to the electrical induced damping applied to the device. © 2015 Elsevier B.V. All rights reserved.

Item Type: Article
Impact Factor: cited By 13
Uncontrolled Keywords: Electromagnetic waves; Energy harvesting; Natural frequencies; Switching, Average output power; Electrical damping; Electromagnetic generators; Frequency-tuning; Operational bandwidth; Oscillating cycle; Oscillation cycles; Wideband energy, Damping
Depositing User: Ms Sharifah Fahimah Saiyed Yeop
Date Deposited: 26 Mar 2022 03:24
Last Modified: 26 Mar 2022 03:24
URI: http://scholars.utp.edu.my/id/eprint/31622

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