Abstract
A piezoelectric energy harvester based on the standing wave vibration of a piezoelectric laminated annular plate is proposed in this article. It can convert the rotary energy into the standing wave vibration energy of the piezoelectric laminated annular plate, and then the standing wave vibration of the thin plate can be directly converted to electrical energy through direct piezoelectric effect of the piezoelectric ceramics. The idea of utilizing the standing wave vibration of the thin plate for rotary energy harvesting is novel according to the existing literature. The proposed structure is particularly suitable for rotating mechanical energy harvesting for its simple structure, convenient installation and high power density. In this article, the energy harvesting structure is introduced in details, the analytical modeling is established to predict the steady-state output features of the energy harvester, and is verified by the finite element analysis (FEA) results as well.
Highlights
Energy harvesting attracts the worldwide attention since it can provide an effective solution to power source for wireless sensor network (WSN) nodes
A piezoelectric laminated annular plate for rotary energy harvesting is creatively proposed in this paper, and this structure is based on the standing wave vibration of the plate
Mode (0, 2) is chosen as the target mode shape and the corresponding layout of the piezoelectric layer with consideration of avoiding charge cancellation for this mode shape is introduced in detail in the paper
Summary
Energy harvesting attracts the worldwide attention since it can provide an effective solution to power source for wireless sensor network (WSN) nodes. In 2009, Erturk et al proposed an approach to avoid charge cancellation by using segmented electrode pairs with consideration to the effects of both electrode configurations and strain nodes of the cantilever beam piezoelectric energy harvester with various boundary conditions [37]. In 2018, Krishnasamy developed two distributed parameter models for a cantilever piezoelectric energy harvester in which the piezoelectric layers were segmented according to the strain nodes of the concerned vibration mode They proposed two models to deal with different interfaces with the resistive loads [38]. The electromechanical conversion efficiency and the power density of the harvester are improved by suitable partition and polarization of the piezoelectric layer, as well as corresponding electrode configuration matching with the standing wave vibration mode This structure can be installed on the shaft of rotating mechanisms to supply power for the health monitoring electronics
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