Structural optimisation through material selections for multi-cantilevered vibration electromagnetic energy harvesters
Structural optimisation through material selections for multi-cantilevered vibration electromagnetic energy harvesters
This study investigates the structural optimisation of a multi-cantilevered electromagnetic anti-phase energy harvester by considering the optimum material choice. The mathematical model for the harvester was first developed, displaying an excellent correlation when compared with the experimental results. Afterwards, the anti-phase harvester was structurally optimised under a defined set of constraints while only considering a single material for all cantilever beams. Here, three materials with low damping capacity were considered. It was found that if the beam thickness was unchanged, the optimisation for certain materials would not converge due to high stress levels exceeding the fatigue safety factor of 80.0%. The safety factor was implemented in the optimisation to ensure the device's durability. However, the unsuccessful material exhibited the lowest damping capacity among other materials. Hence, a mixed material approach was attempted which produced an optimum power output of 119.6 mW and a 1.76 V voltage output under a base acceleration input of 0.1 g and a practical volume constraint of 600 cm
3. This corresponds to a 33.3% increase in power output when compared to the single material harvester. Further analysis demonstrated that if the fatigue safety factor was lowered to 60%, the optimised power output would drop by 26.5% to 87.9 mW whereas a slight increase in voltage was recorded. Finally, the optimum material for the masses on the harvester was examined, suggesting that a high-density material must be used for the beam clamp and the proof masses on the magnet beams whereas the mass on the support beam must be minimized.
Anti-phase vibration energy harvesting, Material, Multi-cantilevered, Power, Structural optimisation
Foong, Faruq Muhammad
c2447e9f-b32a-4d99-a872-c6648903c557
Thein, Chung Ket
be1dc467-d763-46fe-99f6-53e1c03c254d
Yurchenko, Daniil
51a2896b-281e-4977-bb72-5f96e891fbf8
1 January 2022
Foong, Faruq Muhammad
c2447e9f-b32a-4d99-a872-c6648903c557
Thein, Chung Ket
be1dc467-d763-46fe-99f6-53e1c03c254d
Yurchenko, Daniil
51a2896b-281e-4977-bb72-5f96e891fbf8
Foong, Faruq Muhammad, Thein, Chung Ket and Yurchenko, Daniil
(2022)
Structural optimisation through material selections for multi-cantilevered vibration electromagnetic energy harvesters.
Mechanical Systems and Signal Processing, 162, [108044].
(doi:10.1016/j.ymssp.2021.108044).
Abstract
This study investigates the structural optimisation of a multi-cantilevered electromagnetic anti-phase energy harvester by considering the optimum material choice. The mathematical model for the harvester was first developed, displaying an excellent correlation when compared with the experimental results. Afterwards, the anti-phase harvester was structurally optimised under a defined set of constraints while only considering a single material for all cantilever beams. Here, three materials with low damping capacity were considered. It was found that if the beam thickness was unchanged, the optimisation for certain materials would not converge due to high stress levels exceeding the fatigue safety factor of 80.0%. The safety factor was implemented in the optimisation to ensure the device's durability. However, the unsuccessful material exhibited the lowest damping capacity among other materials. Hence, a mixed material approach was attempted which produced an optimum power output of 119.6 mW and a 1.76 V voltage output under a base acceleration input of 0.1 g and a practical volume constraint of 600 cm
3. This corresponds to a 33.3% increase in power output when compared to the single material harvester. Further analysis demonstrated that if the fatigue safety factor was lowered to 60%, the optimised power output would drop by 26.5% to 87.9 mW whereas a slight increase in voltage was recorded. Finally, the optimum material for the masses on the harvester was examined, suggesting that a high-density material must be used for the beam clamp and the proof masses on the magnet beams whereas the mass on the support beam must be minimized.
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Accepted/In Press date: 11 May 2021
e-pub ahead of print date: 18 May 2021
Published date: 1 January 2022
Additional Information:
Funding Information:
The authors would like to thank to University of Nottingham Ningbo China, New Researchers Grant from Faculty of Science and Engineering (FOSE) and Institute of Asia and Pacific Studies (IAPS) Research Grant for funding this research.
Publisher Copyright:
© 2021 Elsevier Ltd
Keywords:
Anti-phase vibration energy harvesting, Material, Multi-cantilevered, Power, Structural optimisation
Identifiers
Local EPrints ID: 468142
URI: http://eprints.soton.ac.uk/id/eprint/468142
ISSN: 0888-3270
PURE UUID: ac7d805c-e8dd-4a5a-863d-f7ce92c8fd71
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Date deposited: 03 Aug 2022 17:21
Last modified: 17 Mar 2024 04:11
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Author:
Faruq Muhammad Foong
Author:
Chung Ket Thein
Author:
Daniil Yurchenko
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