設施農業：智慧感測【機械工程學系/吳嘉哲副教授】
| 論文篇名 | An Electromechanical Model for Clamped-Edge Bimorph Disk Type Piezoelectric Transformer |
| 期刊名稱 | SENSORS |
| 發表年份,卷數,起迄頁數 | 2022,22(6), 2237 |
| 作者 | Chen, Shao-En; Gunawan, Hadi; Wu, Chia-Che(吳嘉哲)* |
| DOI | 10.3390/s22062237 |
| 英文摘要 | In this paper, an analytical solution for a clamped-edge bimorph disk-type piezoelectric transformer with Kirchhoff thin plate theory is proposed. The electromechanical equations for transient motions are first derived, and coupled expressions for mechanical response and voltage output are obtained. For the case of excitation around the first resonant frequency, the resulting equations are further simplified. There are analytical solutions for a mechanical response, voltage, current, and power outputs. According to the analytical model, the output voltage is affected by the inner radius of the input and output electrodes, the radius of the piezoelectric transformer (PT), and the thickness ratio between the lead zirconate titanate (PZT) layer and the substrate. When the inner radius of the input electrode approaches zero (electrode becomes circular shape), it achieves maximum output voltage at the first resonance frequency excitation. On the contrary, when the inner radius of the output electrode approaches zero, the output voltage reaches its minimum value. Voltage ratios remain constant as the disk radius changes, and the first resonance frequency is inversely proportional to the square of the disk radius. The voltage ratio is fixed even with the miniaturization of the PT. |
| 發表成果與本中心研究主題相關性 | 本論文提出一邊緣固定式雙層圓盤壓電變壓器，此變壓器之結構以兩層相同的壓電材料與環狀電極設計於外露之表面，外徑電極的尺寸與結構之直徑相同，兩層壓電層具有同樣的厚度而兩者之間絕緣，並此壓電層之邊緣完全被固定住。本研究藉由解析解和有限元素法之輔助進行變壓器結構之模態分析來驗證實驗結果而最後數學模型以及試驗值可以達到誤差小於 10%為目標。本研究的技術可應用牧場廢棄物監控的廢水排放品質監測系統中，經由變壓器的設計可以大幅降低大陽能儲能轉換的能耗，降低各監測系統中的電源供應能耗。將所產生的廢棄物就地處理，以達永續農業之目的。 |
