Study in circular auxetic structures for efficiency enhancement in piezoelectric vibration energy harvesting

Abstract

Piezoelectric (PZT) components are one of the most popular elements in vibration sensing and also energy harvesting. They are very well established, cost effective and available in different geometries however there are still several challenges in their application particularly in vibration energy harvesting. They are normally narrow-band elements and work in high-frequency range. Their efficiency and power extraction density are also generally low compared with different electromagnetic techniques. Auxetic structures are proposed here to enhance efficiency of the piezoelectric circular patches in vibration energy harvesting. These kinds of patches namely PZT buzzers are inexpensive (less than 10 USD) elements and easily available. Two novel circular auxetic substrates are proposed to improve power extraction capacity of the conventional piezoelectric buzzers. Negative Poison’s ratio of the proposed meta-structure helps in efficiency enhancement. The concept is introduced, analyzed and verified through the finite element modeling and experimental testing. The idea is proved to work by comparing the harvested electrical power in the auxetic design against the conventional plain system. A parametric study is then carried out and effects of important electrical and geometrical parameters as well as the material property on the power extraction efficiency are assessed to arrive at optimum parameters. It is shown that by employing the auxetic design, a remarkable improvement in the harvested power is achievable. It is shown that for the two proposed auxetic designs, at the resonance frequency, we could reach to 10.2 and 13.3 magnification factor with respect to the plain energy harvester. Another important feature is that the resonant frequency in these new designs is very much lower than the conventional resonators. Results of this study can open a new path to application of inexpensive PZT buzzers in large-scale vibration energy harvesting.

Design and engineering of high‐performance triboelectric nanogenerator for ubiquitous unattended devices

“…The direct mechanical wear between triboelectric materials leads to TENG devices' poor stability with unstable outputs. Studies have shown that increasing the porosity of materials and decreasing the effective Young's modulus make the triboelectric materials more deformable and increase the effective contact area, resulting in an improved TENG performance and mechanical stability, 94,119,145,146,157 through introducing 3D printed metastructure, [158][159][160] auxetic structures, [161][162][163] and so forth. For instance, Matlack et al 158 suggested that the 3D-printed meta-structure with embedded resonators could not only reduce the overall mass of the device but also expand and reduce the Bragg gap, which has a unique advantage for the absorption of low-frequency vibration energy.…”

Recent acoustic energy harvesting methods and mechanisms: A review

“…The new concept of enhancing efficiency of energy harvesting devices is the auxetic resonator-based model presented by Eghbali et al 71 The model consists of a quarter wavelength tube as well, over which the cantilever of the auxetic substrate and plain plate is mounted Figure 25. In this article, the analysis of plain and cellular auxetic plates is observed.…”

“…Figure 25. Plain cantilever is mounted over the quarter wavelength tube and auxetic plate cantilever 71. …”

Rancang Bangun Purwarupa Energy Harvesting menggunakan Piezoelektrik sebagai Pembangkit Energi Listrik

“…Salah satu bentuk memanen energi yang aktif dilakukan adalah dengan Penulis Korespondensi: Telp : +62-813-1370-4872 e-mail : koes_kusnandar@yahoo.com memanfaatkan getaran. Konversi energi getaran menjadi energi listrik dilakukan melalui tiga metode populer yaitu elektromagnetik, triboelektrik, dan piezoelektrik (Eghbali et al, 2020). Diantara ketiga metode tersebut, piezoelektrik paling banyak digunakan untuk memanen energi getaran.…”

“…Diantara ketiga metode tersebut, piezoelektrik paling banyak digunakan untuk memanen energi getaran. Namun demikian, masalah efisiensi dan daya yang relatif kecil menjadi tantangan dalam membangun pemanen energi berbasis piezoelektrik (Varadha & Rajakumar, 2018;Eghbali et al, 2020;Wang et al, 2020). Beberapa penelitian telah dilakukan dalam konteks pemanenan energi getaran menggunakan piezoelektrik (Afif & Rini, 2017;Büyükkeskin et al, 2019;Nechibvute et al, 2012;Niasar et al, 2020;Pratama dkk., 2015;Xu et al, 2018;Yuliana dkk., 2020;Zebua dkk., 2019).…”