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The numerical and experimental investigations of a gimballed pendulum energy harvester

The numerical and experimental investigations of a gimballed pendulum energy harvester
The numerical and experimental investigations of a gimballed pendulum energy harvester
A simple or single-degree-of-freedom (1-DOF) pendulum system is a typical mechanism that has been used for vibration energy harvesting. Generally, a 1-DOF pendulum system is constrained to move on a single plane which limits the system when excited by multi-directional disturbances. In order to overcome this limitation, this paper considers the application of a 2-axis gimbal pendulum system. The gimballed pendulum system consists of two perpendicular horizontal pivots which allow the pendulum to achieve spherical or orbital motion around the pivots. Theoretical and experimental investigations of a gimballed pendulum energy harvesting system for multi-directional excitation are described in this paper. A mathematical model of the mechanical arrangement is derived based on the Lagrange equation and a simplified assumption that the perpendicular pivots are treated as two coupled rotating references with geometric relationships. This derived model is able to realistically reflect and identify the asymmetric properties between the coupled references created by a gimbal mechanism. The theoretical and experimental investigations of 1-DOF and coupled-DOF (2-DOF) pendulum dynamics are presented using a constant excitation amplitude over a range of frequencies with different heading angles representing the directions of the external disturbance. The numerical and experimental results show generally good correlation and the dominant coupling effect of the coupled rotating references that modulates the pendulum responses is theoretically and practically captured. Interestingly, the measured simultaneous electrical power production generated by the coupled dynamics of the gimballed pendulum achieves less power compared to when it dynamically performs as a 1-DOF system at the same disturbing condition.
0020-7462
1-11
Anurakpandit, Trewut
8e5bab52-3804-4aa1-9a1a-302e60554afe
Townsend, Nicholas
3a4b47c5-0e76-4ae0-a086-cf841d610ef0
Wilson, Philip
8307fa11-5d5e-47f6-9961-9d43767afa00
Anurakpandit, Trewut
8e5bab52-3804-4aa1-9a1a-302e60554afe
Townsend, Nicholas
3a4b47c5-0e76-4ae0-a086-cf841d610ef0
Wilson, Philip
8307fa11-5d5e-47f6-9961-9d43767afa00

Anurakpandit, Trewut, Townsend, Nicholas and Wilson, Philip (2020) The numerical and experimental investigations of a gimballed pendulum energy harvester. International Journal of Non-Linear Mechanics, 120, 1-11. (doi:10.1016/j.ijnonlinmec.2019.103384).

Record type: Article

Abstract

A simple or single-degree-of-freedom (1-DOF) pendulum system is a typical mechanism that has been used for vibration energy harvesting. Generally, a 1-DOF pendulum system is constrained to move on a single plane which limits the system when excited by multi-directional disturbances. In order to overcome this limitation, this paper considers the application of a 2-axis gimbal pendulum system. The gimballed pendulum system consists of two perpendicular horizontal pivots which allow the pendulum to achieve spherical or orbital motion around the pivots. Theoretical and experimental investigations of a gimballed pendulum energy harvesting system for multi-directional excitation are described in this paper. A mathematical model of the mechanical arrangement is derived based on the Lagrange equation and a simplified assumption that the perpendicular pivots are treated as two coupled rotating references with geometric relationships. This derived model is able to realistically reflect and identify the asymmetric properties between the coupled references created by a gimbal mechanism. The theoretical and experimental investigations of 1-DOF and coupled-DOF (2-DOF) pendulum dynamics are presented using a constant excitation amplitude over a range of frequencies with different heading angles representing the directions of the external disturbance. The numerical and experimental results show generally good correlation and the dominant coupling effect of the coupled rotating references that modulates the pendulum responses is theoretically and practically captured. Interestingly, the measured simultaneous electrical power production generated by the coupled dynamics of the gimballed pendulum achieves less power compared to when it dynamically performs as a 1-DOF system at the same disturbing condition.

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2nd Revision Anurakpandit Trewut - Accepted Manuscript
Restricted to Repository staff only until 14 December 2020.
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More information

Submitted date: 11 November 2019
Accepted/In Press date: 14 December 2019
e-pub ahead of print date: 19 December 2019
Published date: April 2020

Identifiers

Local EPrints ID: 435936
URI: http://eprints.soton.ac.uk/id/eprint/435936
ISSN: 0020-7462
PURE UUID: 928f447a-deb3-4c6c-977b-a1d8fef5de7e
ORCID for Philip Wilson: ORCID iD orcid.org/0000-0002-6939-682X

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Date deposited: 16 Dec 2019 17:30
Last modified: 31 Jan 2020 01:24

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