Increasing the power of piezoelectric energy harvesters by magnetic stiffening

W. Al-Ashtari, M. Hunstig, T. Hemsel, W. Sextro, Journal of Intelligent Material Systems and Structures 24 (2013) 1332–1342.

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Abstract
A piezoelectric cantilever beam with a tip mass at its free end is a common energy harvester configuration. This article introduces a new principle of designing such a harvester that increases the generated power without changing the resonance frequency of the harvester: the attraction force between two permanent magnets is used to add stiffness to the system. This magnetic stiffening counters the effect of the tip mass on the efficient operation frequency. Five set-ups incorporating piezoelectric bimorph cantilevers of the same type in different mechanical configurations are compared theoretically and experimentally to investigate the feasibility of this principle: theoretical and experimental results show that magnetically stiffened harvesters have important advantages over conventional set-ups with and without tip mass. They generate more power while only slightly increasing the deflection in the piezoelectric harvester and they can be tuned across a wide range of excitation frequencies.
Publishing Year
Journal Title
Journal of Intelligent Material Systems and Structures
Volume
24
Issue
11
Page
1332-1342
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Al-Ashtari W, Hunstig M, Hemsel T, Sextro W. Increasing the power of piezoelectric energy harvesters by magnetic stiffening. Journal of Intelligent Material Systems and Structures. 2013;24(11):1332-1342. doi:10.1177/1045389X13483021
Al-Ashtari, W., Hunstig, M., Hemsel, T., & Sextro, W. (2013). Increasing the power of piezoelectric energy harvesters by magnetic stiffening. Journal of Intelligent Material Systems and Structures, 24(11), 1332–1342. https://doi.org/10.1177/1045389X13483021
@article{Al-Ashtari_Hunstig_Hemsel_Sextro_2013, title={Increasing the power of piezoelectric energy harvesters by magnetic stiffening}, volume={24}, DOI={10.1177/1045389X13483021}, number={11}, journal={Journal of Intelligent Material Systems and Structures}, author={Al-Ashtari, Waleed and Hunstig, Matthias and Hemsel, Tobias and Sextro, Walter}, year={2013}, pages={1332–1342} }
Al-Ashtari, Waleed, Matthias Hunstig, Tobias Hemsel, and Walter Sextro. “Increasing the Power of Piezoelectric Energy Harvesters by Magnetic Stiffening.” Journal of Intelligent Material Systems and Structures 24, no. 11 (2013): 1332–42. https://doi.org/10.1177/1045389X13483021.
W. Al-Ashtari, M. Hunstig, T. Hemsel, and W. Sextro, “Increasing the power of piezoelectric energy harvesters by magnetic stiffening,” Journal of Intelligent Material Systems and Structures, vol. 24, no. 11, pp. 1332–1342, 2013.
Al-Ashtari, Waleed, et al. “Increasing the Power of Piezoelectric Energy Harvesters by Magnetic Stiffening.” Journal of Intelligent Material Systems and Structures, vol. 24, no. 11, 2013, pp. 1332–42, doi:10.1177/1045389X13483021.

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