2022 Fiscal Year Final Research Report
Investigation of electromechanically coupled properties and increase in performance of piezoelectric vibration energy harvester by using multi-switching nonlinear circuit
| Project/Area Number |
20K04347
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Review Section |
Basic Section 20010:Mechanics and mechatronics-related
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| Research Institution | Kanazawa University |
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Principal Investigator |
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| Project Period (FY) |
2020-04-01 – 2023-03-31
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| Keywords | 振動発電 / 非線形圧電性 / マルチスイッチ非線形回路 |
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| Outline of Final Research Achievements |
This study was aimed at deriving a governing equation which can predict electromechanical properties of a piezoelectric vibration energy harvester accurately and achieving an increase in the power output and the frequency bandwidth by using a multi-switching nonlinear circuit which utilizes an increase in the electromechanical coupling. We demonstrated that a governing equation based on the nonlinear piezoelectricity considering the ferroelastic hysteresis replicates the experimental results well, and we developed a simple numerical methodology for the analysis coupled with the harvester and the nonlinear circuit. We also demonstrated an increase in the power output and the frequency bandwidth by revealing the relationship between the switching numbers and the frequency response properties.
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| Free Research Field |
機械力学
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| Academic Significance and Societal Importance of the Research Achievements |
従来、線形の圧電方程式を基にした支配方程式が振動発電の機械-電気特性の理解に広く利用されていたが、加振水準が変動すると実験を再現しなかった。強弾性ヒステリシスによる非線形圧電性を考慮した新しい支配方程式により、振動発電の正確な性能予測が可能となった。また、一部のスイッチ非線形回路との連成解析は、変位の４次方程式で簡略化される事を実証した。新しい支配方程式とマルチスイッチ非線形回路により、従来技術では実現できない振動発電素子の高出力・広帯域化への可能性を確認した。この新しい解析モデルにより、IoT電源用途の振動発電の設計が容易になると考えられる。
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