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• W2929506597 abstract "In the aim of giving an alternative to chemical batteries for energy supply of wireless autonomous devices, the present work focuses on ambient vibration energy harvesting using harvesters taking benefit of energy stored in an oscillating mass subjected to acceleration. More particularly, the attention is put on nonlinear bistable harvesters which offer a wider bandwidth than linear ones. However, due to their nonlinearities, these bistable harvesters exhibit different coexisting behaviors (orbits) on their operating frequency range. Only some of them are interesting for energy harvesting because of their high amplitude of oscillations inducing high energy levels (high orbits). Nevertheless, those high orbits are coexisting with low orbits (i.e., low harvestable energy) on a major portion of their frequency range and thus are not automatically reached. This work hence introduce new strategies to experience orbit jumps from low to high orbits playing with different parameters of the bistable harvester. Preliminary analyses based on energy considerations demonstrates that the most technically achievable strategy, adopted for the experimental analysis, is the orbit jump with fast modifications of its buckling level. More particularly, the bistable harvester is first quickly over-buckled at a particular instant and then quickly released to its initial buckling level when the mass reaches a maximum of displacement (in order to maximize the potential energy brought to the mass). Two elements of this strategy were adjustable: the amplitude of the buckling level variation and the instant at which this change starts. Experimental results show that choosing a good combination of those two elements leads to a high probability to jump from low to high orbits on the whole frequency range concerned by high orbits (from 70% chance to 100% chance to jump). Thanks to this orbit jump technique, the high orbits can be ensured for the considered bistable harvester on a continuous wide frequency range of 50 Hz (from 20 Hz to 70 Hz) on which the mean harvested power varies from 20 μW to 500 μW. Finally, it is shown that the energy consumed to ensure the orbit jump can be recovered within 2 s." @default.
• W2929506597 created "2019-04-11" @default.
• W2929506597 creator A5032579514 @default.
• W2929506597 creator A5059188459 @default.
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• W2929506597 date "2019-08-01" @default.
• W2929506597 modified "2023-10-18" @default.
• W2929506597 title "Orbit jump in bistable energy harvesters through buckling level modification" @default.
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• W2929506597 doi "https://doi.org/10.1016/j.ymssp.2019.03.051" @default.
• W2929506597 hasPublicationYear "2019" @default.
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