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Extended frequency bandwidth through multi-degree-of-freedom nonlinear magneto-mechanical energy harvesting

Extended frequency bandwidth through multi-degree-of-freedom nonlinear magneto-mechanical energy harvesting
Extended frequency bandwidth through multi-degree-of-freedom nonlinear magneto-mechanical energy harvesting
Energy harvesting from different vibration sources is typically designed by means of a single degree of freedom approach and implementing both linear and nonlinear principles and techniques. In this paper, starting from the experience of the authors in different applications and using linear magneto-inductive electromechanical oscillators, a two-degree-of-freedom energy harvester is designed with the aim of supplying sensors in a wing typical section. The energy harvester can be modelled as a system of two masses with linear springs or nonlinear elastic interactions due to magneto-static forces. The equivalent mechanical dampers of the same device are four coils that can be connected to the electric interface and then to the electric load circuit. The strong improvement of this simple extension of a linear generator with two degrees of freedom relies on the dynamic improvements of the coupling to the source that can be tuned in order to increase the frequency bandwidth of the device. The simulations show that, although the limited stroke of the magnets and the undesired mechanical friction can reduce the energy harvested, the nonlinearities of the magnetic forces and fluxes can represent an effective advantage, in particular, in a multi-degree of freedom system subject to a large frequency bandwidth input or random excitations. Potential perspectives could be also implemented through semi-active or active strategies obtained through the electric interface.
energy harvesting, nonlinear magnetic coupling, multi-degree-of-freedom, aeroelastic vibrations
Bonisoli, E.
49a23ffd-138b-4b34-ab92-6b20eb3b0ed3
Manca, N.
84740bd4-4bf9-40af-8e1a-4f50526f631c
Ghandchi-Tehrani, M.
c2251e5b-a029-46e2-b585-422120a7bc44
Da Ronch, A.
a2f36b97-b881-44e9-8a78-dd76fdf82f1a
Gianfrancesco, M.
70b4d464-04b1-480c-9b33-fda4133e04dc
Bonisoli, E.
49a23ffd-138b-4b34-ab92-6b20eb3b0ed3
Manca, N.
84740bd4-4bf9-40af-8e1a-4f50526f631c
Ghandchi-Tehrani, M.
c2251e5b-a029-46e2-b585-422120a7bc44
Da Ronch, A.
a2f36b97-b881-44e9-8a78-dd76fdf82f1a
Gianfrancesco, M.
70b4d464-04b1-480c-9b33-fda4133e04dc

Bonisoli, E., Manca, N., Ghandchi-Tehrani, M., Da Ronch, A. and Gianfrancesco, M. (2015) Extended frequency bandwidth through multi-degree-of-freedom nonlinear magneto-mechanical energy harvesting. International Conference on Structural Engineering Dynamics (ICEDyn), Portugal. 22 - 24 Jun 2015. 8 pp .

Record type: Conference or Workshop Item (Paper)

Abstract

Energy harvesting from different vibration sources is typically designed by means of a single degree of freedom approach and implementing both linear and nonlinear principles and techniques. In this paper, starting from the experience of the authors in different applications and using linear magneto-inductive electromechanical oscillators, a two-degree-of-freedom energy harvester is designed with the aim of supplying sensors in a wing typical section. The energy harvester can be modelled as a system of two masses with linear springs or nonlinear elastic interactions due to magneto-static forces. The equivalent mechanical dampers of the same device are four coils that can be connected to the electric interface and then to the electric load circuit. The strong improvement of this simple extension of a linear generator with two degrees of freedom relies on the dynamic improvements of the coupling to the source that can be tuned in order to increase the frequency bandwidth of the device. The simulations show that, although the limited stroke of the magnets and the undesired mechanical friction can reduce the energy harvested, the nonlinearities of the magnetic forces and fluxes can represent an effective advantage, in particular, in a multi-degree of freedom system subject to a large frequency bandwidth input or random excitations. Potential perspectives could be also implemented through semi-active or active strategies obtained through the electric interface.

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More information

Published date: 22 June 2015
Venue - Dates: International Conference on Structural Engineering Dynamics (ICEDyn), Portugal, 2015-06-22 - 2015-06-24
Keywords: energy harvesting, nonlinear magnetic coupling, multi-degree-of-freedom, aeroelastic vibrations
Organisations: Aerodynamics & Flight Mechanics Group

Identifiers

Local EPrints ID: 380033
URI: https://eprints.soton.ac.uk/id/eprint/380033
PURE UUID: dc8512a8-fd91-476c-8b76-280dab92a089

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Date deposited: 21 Aug 2015 09:44
Last modified: 17 Jul 2017 20:38

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Contributors

Author: E. Bonisoli
Author: N. Manca
Author: A. Da Ronch
Author: M. Gianfrancesco

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