本文選題：壓電微換能器　切入點：靜態(tài)特性　出處：《南京理工大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：l本論文對單層壓電微換能器的特性進行了研究,包括靜態(tài)特性及動態(tài)特性。本文所研究的換能器是懸臂梁式,并為層合梁,包含壓電層、被動層及上下電極層,前者的厚度在微尺度下。首先強電場激勵下壓電層發(fā)生彎曲時,必須要考慮壓電材料的電致伸縮效應(yīng),這將使得壓電方程中出現(xiàn)非線性項,即電場強度的平方項。其非線性隨電場強度而改變,電場增大則相應(yīng)增大。實驗表明：當(dāng)結(jié)構(gòu)的特征尺寸在微尺度時,其力學(xué)特性對特征尺寸有著很大的依賴性,與宏觀尺寸下顯著不同,這種特性被稱為尺度效應(yīng)。因此在這篇文章中將會運用偶應(yīng)力理論來研究該換能器在尺度效應(yīng)下的靜態(tài)應(yīng)變。最后,由于懸臂梁式的彎曲換能器一般工作在其彎曲振動的諧振頻率附近,因此,為了得到換能器的最佳性能,需要深入研究其動態(tài)特性。本文中運用模態(tài)分解來分析換能器動態(tài)機電響應(yīng),并使用MATLAB軟件對該響應(yīng)進行數(shù)值模擬。結(jié)果顯示：當(dāng)壓電層的厚度處在微米尺度時,換能器壓電層的無量綱剛度會發(fā)生顯著增加,這將影響換能器的諧振頻率,導(dǎo)致?lián)Q能器一階模態(tài)下的電荷和電壓輸出相應(yīng)的減少。
[Abstract]:In this paper, the characteristics of single-layer piezoelectric microtransducer are studied, including static and dynamic characteristics. The transducer studied in this paper is cantilever beam, and laminated beam, including piezoelectric layer, passive layer and upper and lower electrode layer. The thickness of the former is in the microscale. Firstly, when the piezoelectric layer bends under the strong electric field, the electrostrictive effect of the piezoelectric material must be considered, which will lead to the nonlinear term in the piezoelectric equation. That is, the square term of electric field intensity. Its nonlinearity changes with the electric field intensity, and the electric field increases accordingly. The experimental results show that when the characteristic size of the structure is in the micro scale, the mechanical properties of the structure are greatly dependent on the characteristic size. In this paper, the static strain of the transducer under the scale effect will be studied by using the theory of couple stress. Because the cantilever beam type bending transducer generally works near the resonant frequency of its bending vibration, therefore, in order to obtain the best performance of the transducer, In this paper, modal decomposition is used to analyze the dynamic electromechanical response of the transducer, and a numerical simulation is carried out by using MATLAB software. The results show that when the thickness of the piezoelectric layer is in the micron scale, The dimensionless stiffness of the piezoelectric layer of the transducer will increase significantly, which will affect the resonant frequency of the transducer, resulting in the corresponding reduction of the charge and voltage output in the first mode of the transducer.
【學(xué)位授予單位】：南京理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TB552

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