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標題: 利用樑與薄膜結構之鋯鈦酸鉛換能器
Feasibility Study of PZT Transducer Using Beam-Membrane Structure
作者: 陳麗同
Chen, Li-Tong
關鍵字: low frequency;低頻;piezoelectric generate device;transformer;壓電發電裝置;變壓器
出版社: 機械工程學系所
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本文主要是探討低於頻率1 kHz下壓電換能器。目前以薄膜-樑結構作為發電機與變壓器。而發電機發電原理以貼附在樑上PZT塊材做為激振器,當樑被激振產生擺動與共振時,將振動能量傳送到薄膜,使貼附在薄膜上PZT塊材因振動產生電壓。且在設計貼附壓電陶瓷材料,輸入為一個電極在輸出方面為多個電極形式增加輸出電壓量。壓電變壓器設計構想使樑-薄膜兩結構頻率相近,讓效能發揮最大。
將設計好的結構進行振動量測得到實驗頻率,其驗證頻率方面可藉由有限元素法及相關理論公式比較驗證,結果三組頻率驗證都很接近,誤差在10%內。尺寸探討第一組:薄膜尺寸15cm×15cm×4mm,樑尺寸 2.54cm×2.4mm×2.4mm,發電量為37.6 mV。第二組為了發電量增大,增加樑尺寸擺動力增大:薄膜尺寸:15cm×15cm×4mm,樑尺寸: 5cm×8mm×8mm ,發電量為88 mV。為了讓發電量到達最佳值探討尺寸優化部份,探討樑寬度、長度與薄膜厚度以及PZT塊材擺放位置對電壓關係式,其優化尺寸:薄膜尺寸:15cm×15cm×3mm,樑尺寸:15cm×8mm×8mm,電壓輸出效應為110 mV,是原先第一組設計高出3倍

The main objective of this thesis is to study piezoelectric transducers at frequency below 1 kHz. A piezoelectric generator and a piezoelectric transformer are designed and developed. A piezoelectric generator is driven by mechanical vibration at a specific frequency close to a resonance frequency of structure and produced an output voltage at the same frequency. The energy flows from the mechanical fields of vibration to the output electric energy. A beam-membrane structure; a cantilever beam with a PZT ceramic and one pair of input electrodes on the center of a membrane with a PZT ceramic and more than one pair of output electrodes; has been used to develop the piezoelectric generator. The voltage is generated from the PZT ceramic on chromium-copper membrane when chromium-copper cantilever beam is stretched by ambient vibration or is driven by PZT ceramic. In the other hand, a piezoelectric transformer is driven by an input voltage near a resonance of structure to generate mechanical vibration and produce an output voltage under mechanical loads at the same frequency. The energy flows from the electrical energy of the input to the mechanical fields of vibration, then back to the output electric energy.

Typically, deign resonance frequencies and output voltage of piezoelectric generator and transformer is crucial to its performance. This thesis used theoretical and numerical analysis to calculate the resonance frequencies of beam-membrane piezoelectric transducers. In the meantime, resonance frequencies and relative mode shapes of transducers are also measured experimentally. Resonance frequencies from theoretical model and from finite element model agree very well with experimental results, and error is less than 10%. Using theoretical and finite element model, geometry of beam-membrane piezoelectric generator is designed to get better output voltage. Three different sizes of piezoelectric transducer are developed in this thesis. The three sizes of beam-membrane generators are 25.4mm2.4mm2.4mm, 50mm8mm8mm, and 150mm8mm8mm, respectively, for cantilever beams and 150mm150mm4mm, 150mm150mm4mm, 150mm150mm3mm for membranes, respectively. The output voltage from third design of transducer is three times larger than first design of transducer.
其他識別: U0005-0708200920395700
Appears in Collections:機械工程學系所

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