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Communication Dans Un Congrès Année : 2021

Global sensitivity analysis of bistable energy harvesting systems via Sobol indices

Résumé

Bistable systems are often explored to construct high-performance energy harvesters, which can be used to power many mobiles and low-power devices (e.g. mobile phones, medical implants, etc), converting vibration energy into electricity in a wide frequency band. On the other side, the performance of the energy recovery processes underlying these harvesters present high sensitivity to small perturbations in the physical parameters, which can drastically decrease their efficiency. To better understand the phenomena related to this high sensitivity, seeking to improve the efficiency of these energy-recovering processes, this study conducts a global sensitivity analysis of bistable energy harvesting systems, to identify which parameters most affect harvested power. Different models are evaluated, first the classic Duffing like bistable system, then considering a nonlinear piezoelectric constitutive relationship, and finally, considering geometric and dynamic asymmetries. A variance decomposition technique, which employs Sobol indices to measure the sensibility of the harvested power concerning the system parameters is used to access the sensibility, being able to quantify the contribution of each individual or joint variable concerning the total variance. The results show that the excitations parameters, dynamic asymmetry, and piezoelectric from the electrical domain are the most important parameters that most affect the mean power output. It has also been shown that the order of importance of the parameters can change depending on stability conditions. Besides, the damping ratio, piezoelectric constant from the mechanical domain, and geometric asymmetry present no sensitivity. In this way, crucial questions can be answered, like when and how variations in physical parameters affect the average power harvested, being fundamental knowledge to explore dynamic characteristics and optimization design.
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Dates et versions

hal-03347052 , version 1 (16-09-2021)

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  • HAL Id : hal-03347052 , version 1

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João Pedro C V Norenberg, Americo Cunha Jr, Samuel da Silva, Paulo Sergio Varoto. Global sensitivity analysis of bistable energy harvesting systems via Sobol indices. Stochastic Resonance 40 years (SR40), Sep 2021, Perugia, Italy. ⟨hal-03347052⟩

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