Loughborough University
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Vibration energy harvester for variable speed rotor applications using passively self-tuned beams

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journal contribution
posted on 2018-11-23, 10:41 authored by Panagiotis Alevras, Stephanos TheodossiadesStephanos Theodossiades
A vibration energy harvester is proposed for rotating systems based on transverse vibrations of an assembly of thin beams and electromagnetic interaction of a carried magnet with a coil of wire. The harvester is designed in a way such that centrifugal forces are utilized to tune the system’s natural frequency to the expected frequency of torsional vibrations. In fact, a novel combination of a tuning mass positioned at the beam’s support and an applied preload are introduced to establish a tuning mechanism that is capable of maintaining resonance along a wide frequency range. The device’s tuning can cover relatively high rotor speeds, overcoming previous limitations on the size and the physics of tuning via axial loads. Moreover, exact expressions of the beams’ mode shapes are taken into account to improve the accuracy of the proposed tuning mechanism. Numerical simulations of the device’s response are carried out for case studies corresponding to different frequency orders. It is shown that the system can maintain a flat power output across a wide range of operating speeds, effectively leading to purely broadband energy harvesting.


The authors wish to express their gratitude to the Engineering and Physical Sciences Research Council (EPSRC) for the financial support extended to the “Targeted energy transfer in powertrains to reduce vibration-induced energy losses” [Grant number EP/L019426/1], under which this research was carried out.



  • Mechanical, Electrical and Manufacturing Engineering

Published in

Journal of Sound and Vibration


ALEVRAS, P. and THEODOSSIADES, S., 2019. Vibration energy harvester for variable speed rotor applications using passively self-tuned beams. Journal of Sound and Vibration, 444, pp.176-196


© The Authors. Published by Elsevier Ltd.


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This work is made available according to the conditions of the Creative Commons Attribution 4.0 International (CC BY 4.0) licence. Full details of this licence are available at: http://creativecommons.org/licenses/ by/4.0/

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This is an Open Access Article. It is published by Elsevier under the Creative Commons Attribution 4.0 Unported Licence (CC BY). Full details of this licence are available at: http://creativecommons.org/licenses/by/4.0/




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