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Open AccessArticle

Piezoelectric Vibration-Based Energy Harvesting Enhancement Exploiting Nonsmoothness

CEFET/RJ, Department of Mechanical Engineering, 20.271.110 Rio de Janeiro, Brazil
Universidade Federal do Rio de Janeiro, COPPE - Ocean Engineering Program, 21.945.970 Rio de Janeiro, Brazil
Universidade Federal do Rio de Janeiro, COPPE - Department of Mechanical Engineering, Center for Nonlinear Mechanics, 21.941.972 Rio de Janeiro, Brazil
Author to whom correspondence should be addressed.
Actuators 2019, 8(1), 25;
Received: 7 February 2019 / Revised: 1 March 2019 / Accepted: 6 March 2019 / Published: 10 March 2019
Piezoelectric vibration-based energy harvesting systems have been used as an interesting alternative power source for actuators and portable devices. These systems have an inherent disadvantage when operating in linear conditions, presenting a maximum power output by matching their resonance frequencies with the ambient source frequencies. Based on that, there is a significant reduction of the output power due to small frequency deviations, resulting in a narrowband harvester system. Nonlinearities have been shown to play an important role in enhancing the harvesting capacity. This work deals with the use of nonsmooth nonlinearities to obtain a broadband harvesting system. A numerical investigation is undertaken considering a single-degree-of-freedom model with a mechanical end-stop. The results show that impacts can strongly modify the system dynamics, resulting in an increased broadband output power harvesting performance and introducing nonlinear effects as dynamical jumps. Nonsmoothness can increase the bandwidth of the harvesting system but, on the other hand, limits the energy capacity due to displacement constraints. A parametric analysis is carried out monitoring the energy capacity, and two main end-stop characteristics are explored: end-stop stiffness and gap. Dynamical analysis using proper nonlinear tools such as Poincaré maps, bifurcation diagrams, and phase spaces is performed together with the analysis of the device output power and efficiency. This offers a deep comprehension of the energy harvesting system, evaluating different possibilities related to complex behaviors such as dynamical jumps, bifurcations, and chaos. View Full-Text
Keywords: energy harvesting; piezoelectricity; nonsmooth systems; nonlinear dynamics; impact; vibration energy harvesting; piezoelectricity; nonsmooth systems; nonlinear dynamics; impact; vibration
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MDPI and ACS Style

Ai, R.; Monteiro, L.L.S.; Monteiro, P.C.C., Jr.; Pacheco, P.M.C.L.; Savi, M.A. Piezoelectric Vibration-Based Energy Harvesting Enhancement Exploiting Nonsmoothness. Actuators 2019, 8, 25.

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