本文選題：能量回收 + 壓電效應��； 參考：《安徽大學》2017年碩士論文

【摘要】：隨著低功耗無線電子設備的迅猛發(fā)展,如何為這些微型電子設備供能也得到了研究人員的廣泛關注。目前,無線電子設備多利用電池供電,但傳統(tǒng)的化學電池存在使用壽命有限,某些場合還存在更換難度較大的弊端。尋求新型供能方式已成為當務之急。振動機械能普遍存在于周圍環(huán)境中,若能得到較好的回收利用就可將其作為一種潛在的能量替代方式,實現(xiàn)電子設備的自我供能,那么就可以一勞永逸地解決微電子設備對外部電源的依賴問題。本文首先論述生活中比較常見且能夠回收利用的各種能量源及能量回收的方式。其次介紹了壓電振動能量回收和近年來國內外的研究成果與現(xiàn)狀,分析總結了各種優(yōu)化方式及其可借鑒之處。這些方式中,基于壓電效應的振動能量回收以其能量密度高、結構簡單、無電磁污染、易于微型化等優(yōu)點,有著十分光明的應用前景。接下來從壓電材料出發(fā),結合壓電材料的本構方程和振動模式的基本理論,分析了壓電振動能量回收過程的機電轉換機理,得出了理論上懸臂梁結構輸出功率表達式并簡要討論了影響其輸出功率的因素�；谝陨戏治�,我們對所提出的直角復合懸臂梁進行了建模仿真與結構優(yōu)化。利用有限元的方法,結合ANSYS軟件對其進行了模態(tài)仿真,提取了前四階振動模態(tài)結果和應變分布情況。在此基礎之上,得到了結構的一階固有頻率為23.121Hz、三階固有頻率為67.898Hz。此外還進行了結構的諧響應分析,在1～100Hz激勵頻率范圍內,每隔1Hz進行掃頻,載荷選擇正弦振動激勵,并且忽略振型阻尼,按照固有頻率收斂顯示結構中直梁根部壓電陶瓷片上應變的頻率響應。隨后討論了在結構設計過程中,所加載的質量塊大小、結構副梁長度、副梁厚度等因素對直角復合懸臂梁諧振頻率的影響,以此來指導實驗測試中直角復合懸臂梁的實物制作。隨后結合上述研究基礎,詳細闡述了直角復合懸臂梁的制作流程,測試了它的電壓頻率響應和功率輸出表現(xiàn),并將其與傳統(tǒng)的懸臂梁進行對比測試,驗證了仿真分析的有效性。結果表明,在最大加速度為0.08g的正弦振動激勵下,其最大輸出功率可以達到3.4mW,而對比的傳統(tǒng)懸臂梁為2.2mW,即本文提出的直角復合懸臂梁的發(fā)電性能要優(yōu)于同樣激勵條件下的對比傳統(tǒng)懸臂梁。綜上所述,本文的研究有利于減小壓電振動能量回收裝置的體積并提高系統(tǒng)的轉換效率,對微型傳感器等電子設備實現(xiàn)自主供能具有重要意義。
[Abstract]:With the rapid development of low power wireless electronic devices, researchers pay more attention to how to power these micro electronic devices. At present, the wireless electronic equipment mostly uses the battery to supply power, but the traditional chemical battery has the limited service life, some occasions also has the shortcoming which the replacement is difficult. It is urgent to seek new energy supply methods. Vibration mechanical energy generally exists in the surrounding environment. If it can be recycled, it can be used as a potential energy substitute to realize the self-supply of energy for electronic equipment. Then the dependence of microelectronic devices on external power can be solved once and for all. This paper first discusses the various energy sources and ways of energy recovery, which are common in life and can be recycled. Secondly, the paper introduces the energy recovery of piezoelectric vibration and the research results and present situation at home and abroad in recent years, and analyzes and summarizes all kinds of optimization methods and their references. Among these methods, vibratory energy recovery based on piezoelectric effect has a bright future because of its advantages of high energy density, simple structure, no electromagnetic pollution and easy miniaturization. Then, starting from piezoelectric material, combining the constitutive equation of piezoelectric material and the basic theory of vibration mode, the mechanism of electromechanical conversion of piezoelectric vibration energy recovery process is analyzed. The expression of the output power of cantilever beam structure is obtained theoretically and the factors influencing the output power are discussed briefly. Based on the above analysis, we model and simulate the right angle composite cantilever beam and optimize its structure. The modal simulation is carried out by using finite element method and ANSYS software. The first four vibration modal results and strain distribution are extracted. On this basis, the first-order natural frequency of the structure is 23.121 Hz and the third-order natural frequency is 67.898Hz. In addition, the harmonic response of the structure is analyzed. In the range of 1~100Hz excitation frequency, every frequency sweep is carried out at 1Hz intervals, the load selects sinusoidal vibration excitation, and the mode damping is ignored. The frequency response of the strain on the piezoelectric ceramic plate at the root of the straight beam is displayed according to the natural frequency convergence. Then, the influence of the size of the mass block, the length of the auxiliary beam and the thickness of the auxiliary beam on the resonant frequency of the right-angle composite cantilever beam is discussed in the course of the structural design, so as to guide the physical fabrication of the right-angle composite cantilever beam in the experiment. Then, based on the above research basis, the fabrication process of the rectangular composite cantilever beam is described in detail, its voltage frequency response and power output performance are tested, and compared with the traditional cantilever beam, the validity of the simulation analysis is verified. The results show that under the sinusoidal vibration excitation with the maximum acceleration of 0.08g, The maximum output power can reach 3.4 MW, while the conventional cantilever beam compared with the conventional cantilever beam is 2.2 MW, that is, the power generation performance of the rectangular composite cantilever beam proposed in this paper is better than that of the conventional cantilever beam under the same excitation conditions. To sum up, the research in this paper is helpful to reduce the volume of piezoelectric vibration energy recovery device and improve the conversion efficiency of the system. It is of great significance to realize the independent energy supply for electronic devices such as micro sensors.
【學位授予單位】：安徽大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TM619;TN384

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本文編號：1911170