Experimental analysis on the transduction coefficient of a non-linear electromagnetic energy harvesting device with softening stiffness
Non-linear energy harvesting devices in the form of stiffness non-linearity have emerged as among the effective solutions to overcome the performance limit of linear energy harvesting devices. However, up to now, researches on the non-linear devices are only focusing on the ability to widen the band...
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| Main Authors: | , , , |
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| Format: | Article |
| Language: | en |
| Published: |
UMP Publisher
2020
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| Online Access: | http://eprints.utem.edu.my/id/eprint/24747/2/DOCUMENT.PDF http://eprints.utem.edu.my/id/eprint/24747/ https://journal.ump.edu.my/ijame/article/view/2582/813 https://doi.org/10.15282/ijame.17.2.2020.01.0582 |
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| Summary: | Non-linear energy harvesting devices in the form of stiffness non-linearity have emerged as among the effective solutions to overcome the performance limit of linear energy harvesting devices. However, up to now, researches on the non-linear devices are only focusing on the ability to widen the bandwidth while the limit of employing linear transduction coefficient in a non-linear system has yet to be heavily discussed. This paper investigates on the transduction coefficient for both linear and non-linear systems of an electromagnetic energy harvesting device as a function of the excitation frequency. It is proven that the transduction coefficient of the nonlinear device is larger than its equivalent linear device, especially in the multi-stable solutions region. In common practice, the non-linearity in the non-linear system is considered weak, and its transduction coefficient is assumed to converge to the one produced by the linear system. The limits to which the transduction coefficient of a linear system can be employed on the non-linear system were drawn based on the experimental analysis conducted on the proposed device. The device was designed to perform as a linear or non-linear system, where the degree of non-linearity was changed by varying the gap between the magnets. The limit of the transduction coefficient was determined from the analysis of the harmonic ratio. The results show that the linear transduction coefficient is valid to be employed to the non-linear system when the harmonic ratio is less than five per cent at the multi-stable solutions region |
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