Abstract
A new stress-applied mode is proposed on piezoelectric circular diaphragm energy harvester. Differing from the usual mode used in previous researches, the mass stick at the center of the diaphragm (PZT-51) is designed into an annular hollow shape. In this case, stress of the mass is applied along the edge of the copper sheet. A screw bonded with the undersurface of the diaphragm transfers force from the vibrator to the diaphragm. This device has a cylindrical shape and its volume is ∼7.9 cm3. With this new stress-applied mode, the piezoelectric energy harvester (with an optimal load of 18 kΩ, a mass of 30 g) could generate a maximum power output of ∼20.8 mW under 9.8 m·s-2 at its resonant frequency of ∼237 Hz. Meanwhile, the greater the hardness ratio between the ceramic and the copper sheet, the greater the advantages of the new structure.
Highlights
Erturk and Inman built a distributed parameter electromechanical model based on cantilevered piezoelectric energy harvesters,[13] presenting the exact analytical solution of a cantilevered piezoelectric energy harvester with Euler-Bernoulli beam assumptions
With the mass bonded at the center of the piezoelectric ceramic, the power output could reach to ∼10.5 mW at the frequency of ∼155 Hz with the optimal load of approximately 26 kΩ
A new type of stress-applied mode is raised in this article, which could be realized by transforming the form of mass block into annular hollow
Summary
As a kind of transducer with excellent performance and convenient utilization, piezoelectric energy harvester has attracted much attention.[1,2,3,4,5,6,7,8,9,10] It is a potential candidate when collecting surplus mechanical energy. A novel bi-directional piezoelectric energy harvester is introduced by Su and Jean,[11] which can harvest vibration energy bi-directionally due to its composition of two sub-systems. Shen et al changed the form of PZT diaphragm into the double-sided spiral shape and tested its displacement and resonance behaviours.[12] Erturk and Inman built a distributed parameter electromechanical model based on cantilevered piezoelectric energy harvesters,[13] presenting the exact analytical solution of a cantilevered piezoelectric energy harvester with Euler-Bernoulli beam assumptions
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