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    題名: 彈性元件耦合多頻寬壓電獵能器設計、製作與性能測試;Design, fabrication and performance evaluation for the elastic elements coupled multi-frequency piezoelectric harvester
    作者: 賴俊俊;LAI,CHUN-CHUN
    貢獻者: 機械工程學系在職專班
    關鍵詞: 彈性元件;壓電;獵能器;懸臂樑
    日期: 2015-07-08
    上傳時間: 2015-09-23 14:51:07 (UTC+8)
    出版者: 國立中央大學
    摘要: 本論文中,設計與製作了三種型態的彈性元件耦合多頻寬壓電獵能器,作為振動能量獵能器的應用。透過特徵頻率和阻抗匹配的實驗,以評估三種型態獵能器相關之輸出功率。
    A結構型態,以三個螺旋彈簧來支撐壓電懸臂樑,取代傳統的由剛體支持的單自由度壓電懸臂樑獵能器。在振動加速度1.5g時最佳共振頻率為105 Hz,且在最佳負載電阻9.1kΩ時獲得最高的輸出功率10.7 W(瓦)。在振動加速度0.5g時110 Hz被選為最佳共振頻率,且在最佳負載電阻8.2kΩ時獲得最高的輸出功率0.01 mW(毫瓦)。
    B結構型態,選用具有回彈性質的金屬薄板,設計其機構特性成為多種彈性體組合而成的可撓性結構,成為多頻寬壓電懸臂樑獵能器。在振動加速度1.5g時有三個最佳共振頻率為30、65和95 Hz時,且在最佳負載電阻68kΩ時獲得最高的輸出功率0.54 W。在振動加速度0.5g時分別在頻率30和65 Hz時出現兩個最佳共振頻率,且在最佳負載電阻91kΩ時獲得最高的輸出功率116.8 mW。
    C結構型態,外部使用3D列印技術作成圓柱形的上蓋和底座加以包覆,內部固定鈕扣型大小的環形壓電懸臂樑,也結合彈性螺旋彈簧成為多頻寬壓電懸臂樑獵能器。在振動加速度1.5g時出現一個連續寬峰最佳共振頻率為55至80 Hz,且在最佳負載電阻68kΩ時獲得最高的輸出功率0.41 mW。在振動加速度0.5g時最佳共振頻率為25 和110 Hz時,且在最佳負載電阻100kΩ時獲得最高的輸出功率1.40 mW。
    這三種結構型態的壓電獵能器都是兩自由度以上振動體,且實驗結果都獲得多頻寬的共振輸出。因此,可以認定彈性元件的耦合,可提供較寬範圍的共振頻率頻寬。使壓電懸臂獵能器成為多頻寬壓電獵能器,也增強了其獵能性能和頻率的靈活性。
    ;In this study, three models of elastic elements coupled multi-frequency piezoelectric harvester have been designed and developed as the application of vibration-based energy harvester. Through electrical tuning of the characteristic frequency and impedance matching, the output power of the three models of the harvester has been evaluated.
    The Type A model, a new piezoelectric cantilever generator using elastic spiral springs as a supporting mechanism, was fabricated for vibration-based energy harvester application to replace the basic of single-degree-of-freedom (DOF) cantilever generator system supported by a rigid metal bar. Under a base acceleration magnitude of approximately 1.5g, the strongest output power 10.7W was obtained at an optimum load resistance of 9.1kΩ. Under a base acceleration magnitude of approximately 0.5g, the strongest output power 0.01mW was obtained at a optimum load resistance of 8.2kΩ.
    The Type B model, a new piezoelectric cantilever generator using elastic metal sheet, was fabricated with multiple flexible materials to provide elastic elements coupled multi-frequency piezoelectric harvester. Under a base acceleration magnitude of approximately 1.5g, the strongest output power 0.54W was obtained at an optimum load resistance of 68kΩ. Under a base acceleration magnitude of approximately 0.5g, the strongest output power 116.8mW was obtained at an optimum load resistance of 91kΩ.
    The Type C model, a new piezoelectric cantilever generator using 3D printing to produce a cylinder where the circle cantilever beam is mounted in, was fabricated with elastic spiral spring to provide multi-frequency piezoelectric harvester. Under a base acceleration magnitude of approximately 1.5g, the strongest output power 0.41mW was obtained at an optimum load resistance of 68kΩ. Under a base acceleration magnitude of approximately 0.5g, the strongest output power 1.40mW was obtained at an optimum load resistance of 100kΩ.
    The generator could be a 2-DOF vibrating body, which can offer a wide resonance frequency bandwidth. Therefore, it is considered that the elastic spring enhanced the performance and frequency flexibility of the piezoelectric cantilever generator for broadband energy harvesting.
    顯示於類別:[機械工程學系碩士在職專班 ] 博碩士論文

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