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Article Dans Une Revue Structural Control and Health Monitoring Année : 2011

Optimization of the power flow extracted from a flexible structure using a control approach

Résumé

Vibrating energy is a renewable energy that can be used to power wireless transducers. This article presents analytical and numerical results that put forward design parameters for optimizing the energy conversion from mechanical vibration to electrical power with an electromagnetic transducer. The studied structure is a flexible structure using an electromagnetic transducer connected to a resistive feedback loop. This passive harvesting circuit is a simplified representation of the storing system usually including a battery and a rectifying electronic. Here the energy harvesting strategy chosen creates an additional viscous damping on the structure. The numerical model of the generator, including the coupling law, predicts the power transferred between electrical and mechanical energies. For a purely resistive feedback, the study of the harvested energy shows that harvesting and stabilization strategies are different. A simple analytical model, derived from modal synthesis techniques, shows that Jacobi’s maximal power transfer theorem can be adapted for multi-physic problems: the electrical and mechanical damping ratios have to be matched to maximize the power transferred. This result is confirmed by experimental measurements. The analytical study also shows that it is possible to use the root locus to choose the two optimal energy harvesting feedback gains and then consequently the harvesting electronic circuit’s parameters.

Dates et versions

hal-02300179 , version 1 (15-11-2019)

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Didier Mammosser, Emmanuel Foltete, Manuel Collet. Optimization of the power flow extracted from a flexible structure using a control approach. Structural Control and Health Monitoring, 2011, 18 (4), pp.361-381. ⟨10.1002/stc.374⟩. ⟨hal-02300179⟩
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