【作者】 龚立娇；

【导师】 沈星；

【作者基本信息】 南京航空航天大学 ， 测试计量技术与仪器， 2008， 硕士

【摘要】 能量是发展科技的关键,历史上主要的技术发展都与新能源的利用或能源利用方法的改进相关。尤其是将自然环境中浪费掉的能量进行采集、存储并利用具有显著的环保意义,具有广阔的工程应用前景。本文首先分析了压电悬臂结构受简谐力激励下的能量输出,给出了一种压电陶瓷-金属复合结构压电发电器件的设计,并进行了制备;然后在此基础上进行了试验研究;最后研究了适合低频压电陶瓷-金属结构发电器件的能量采集电路。主要研究内容和结果包括:1.从压电方程入手,分析了压电发电元件在力作用下产生电荷,输出电压的原理,讨论了用于能量采集的压电元件等效电路模型。2.通过振动方程并结合力学边界条件,对悬臂压电梁能量采集进行了理论分析。结果表明:压电悬臂梁是一个高效率的能量采集结构,尤其适合应用在低频振动环境中。3.给出了压电陶瓷-金属层叠结构的悬臂式压电发电机设计方案并进行了工艺制备,构建了试验平台,进行了试件的试验研究,研究分析了激振力作用下产生的能量输出效果。4.给出了压电发电机功率转换与调整电路的设计并进行了实验评测。实验结果表明:悬臂式压电器件在振动稳定且持续的环境中具有较好的应用效果,电容储存的电能可提供微瓦功率量级负载使用,初步实现了电能的存储利用。更多还原

【Abstract】 Energy is the key to the technology development. Throughout history, major advancements in technology were always duo to the new energy’s discover or methods improvement for energy utilization. Harvesting, conserving and using the wasted energy in nature are very significant for environment protection, which has strong real application fields.In this paper, firstly, the energy output of the piezoelectric cantilever structure is analyzed under a sinusoidal excitation; then a design of the piezoelectric power generation element is given and the PZT-Metal composite structure is fabricated; finally, experimental study is carried on the base of that, and energy harvesting circuit which is appropriate to the low frequency application is studied. Main research contents and results are as the following:1. The basic principle of the electric charge’appearance and the voltage’s output is studied when the piezoelectric power generation element is the force inspirit. The equivalent circuit model used for the harvest of the energy is analyzed.2. Academic analysis of the energy harvest for the piezoelectric cantilever is made according to the vibration equation and the dynamic limit condition. Results show that piezoelectric cantilever is an efficient energy harvest structure. And it is very appropriate to be applied in the low frequency environment.3. The design scheme of one piezoelectric cantilever structure for energy harvest is given, and it is also fabricated. Experimental study is made to analyze the relation between the energy output and the inspired force.4. The circuit design of the PEG’s (PiezoElectric power Generators) power transition is given and the experimental test is also made. The results show that piezoelectric cantilever element has a good performance if it is applied in a steady and durative vibration environment. And the stored micro power in capacitance can be employed, which realized the fundamental aim in this research更多还原