本研究探討巨集型壓電纖維平板於水中、空氣中元件之結構耦合三維流場並造成結構振動的量測與模擬分析，結構利用壓克力圓管以不同幾何外型設計使流場產生渦流擾動，透過多種實驗量測及計算流體力學之數值模擬的研究方法得知巨集型壓電纖維平板於不同流體介質、不同邊界條件和不同前端幾何設計作動的共振頻率及共振模態。研究主要探討巨集型壓電纖維平板在與空氣和水耦合作動下影響的流固耦合振動特性，並配合不同流速大小的三維流場進行比較，幾何設計利用壓克力圓管複合巨集型壓電纖維平板以固定邊界的形式，透過前端壓克力圓管的設計使流場產生渦流振動，進而讓巨集型壓電纖維平板產生振動。本研究之壓電元件與流體耦合的振動特性使用兩種量測設備進行實驗量測，包括全域式電子斑點干涉術(Electronic Speckle Pattern Interferometry, ESPI)，同時對巨集型壓電纖維平板於流體中的面外振動模態進行即時量測，並紀錄與流體耦合作用下的共振頻率與振動模態。雷射都卜勒振動儀(Laser Doppler Vibrometer, LDV)以單點量測壓電材料與空氣耦合的面外振動位移，並可使用穩態掃頻的方式獲得面外共振頻率。鋼珠落擊，以鋼珠敲擊單邊固定之巨集型壓電纖維平板，使用LDV將變化紀錄訊號後再利用Matlab程式進行快速傅立葉轉換(Fast Fourier Transform, FFT)，得到結構共振頻率。本研究對巨集型壓電纖維平板耦合不同流體的振動特性進行研究，將結構自然共振頻率之實驗量測結果與流固耦合的有限體積數值計算進行分析比較，無論在共振頻率或振動模態皆可相互對應，對於壓電材料的動態特性於實驗量測與數值分析皆進行比較，成功獲得壓電元件於流體內的振動特性。最後，分析高低流速下的流體致振機制，本研究運用流場可視化的實驗裝置，將低流速下的流場粒子流經結構邊界層時的動態特性拍攝記錄，並運用數值模擬的方法將流速流線(streamline)圖與之對應，分析流場在高低流速下的渦旋(vortex)產生原理，並將結果進行分析和討論。

The flow induced vibration characteristics of macro fiber composite piezoelectric strip was investigated on energy harvester. We design the different geometric structure, to produce three dimentional flow field appearing the vortex-induced vibration. Experimental measurements and finite volume numerical calculations were used to determine the resonant frequencies and mode shapes for macro fiber composite piezoelectric strip, which could be used to be piezoelectric vibrators of energy harvester in the fluids of air and water. Varying different velocity of three dimensional flow field were designed to verify the solid-liquid coupled vibrations of piezoelectric elements bonded to acrylic structure under fix-end boundary. Two experimental techniques were used to determine the solid-liquid coupled vibration characteristics. Electric speckle pattern interferometry (ESPI) was used to measure the resonant frequencies and mode shapes associated with out-of-plane vibrations of macro fiber composite piezoelectric strip interacting with fluids. Second, a laser Doppler vibrometer (LDV) was used to obtain the frequency spectrum of vibrating displacement using dynamic signal swept-sine analysis. The vibration coupling characteristics of macro fiber composite piezoelectric strip coupled with different fluids were determined by finite volume numerical calculation and the results were verified with experimental measurements. In this fluid-structure coupled system, the dynamic characteristics of the macro fiber composite piezoelectric materials have a good consistence between experimental and numerical results. Finally, we analyze the flow induced vibration mechanism at high and low flow rate. In this study, the flow visualization experimental device was used to record the dynamic characteristics of the flow particles flowing through the structural boundary layer at low flow rate. The experimental result corresponds with the velocity streamline diagram by numerical simulation method. We observe the principle of vorterx generation in the flow field at high and low flow rates and the results are also discussed.

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