圆盘型压电振动能量收集器的设计和仿真

发布时间：2018-05-28 01:41

本文选题：微机电系统 + 振动能量收集　；参考：《南京邮电大学》2017年硕士论文

【摘要】：随着微机电系统技术和集成电路技术日趋发展,小尺寸、低功耗的微传感器和微执行器的研发取得了巨大的进步,在人体健康检测系统[1]、结构安全检测系统[2]、嵌入式系统等等方面都取得了广泛的应用。但是这些系统设备通常需要微型电池作为供电材料,虽然这些电池能起到很好的供能作用,但是也存在着明显的缺陷,比如电池寿命有限需要不断更换、尺寸较大、受环境影响、化学毒性比较严重。这些都制约着微型器件的发展,国内外研究者提出从环境周围中收集能量,并将其转换成电能供给设备使用。但是目前在研究中存在许多问题,比如由于能量收集装置的尺寸导致输出功率太小,并且大多数装置只有一个共振频率,频率范围太小,导致可以应用的场合单一和能量收集的效率低下。本论文针对目前能量收集装置存在的输出功率过低,工作频率范围太窄等问题,提出了一种圆盘形压电式能量采集结构。本文首先对压电能量收集器的工作原理做了详细的分析,包括材料的选择、材料将振动能转化为电能的过程、压电悬臂梁模型的分析、压电悬臂梁机电耦合理论分析,为器件的设计提供了理论依据。然后利用ANSYS有限元模型对器件的性能进行仿真分析,研究器件各类参数对性能的影响。最后通过研究的器件各类参数对性能的影响,优化器件结构设计,并设计了一种新的结构,用来提高器件的输出特性,并拓宽器件工作频率范围。
[Abstract]:With the development of MEMS and IC technology, the research and development of micro sensors and microactuators with small size and low power consumption have made great progress. It has been widely used in human health detection system, structural safety detection system, embedded system and so on. But these systems often require miniature batteries as the power supply materials. Although these batteries can provide good energy, they also have obvious drawbacks, such as the limited life of the batteries, which need to be constantly replaced, and the size of the batteries is large. Under the influence of environment, the chemical toxicity is more serious. All these restrict the development of micro devices. Researchers at home and abroad proposed to collect energy from the environment and convert it into power supply equipment. But at present there are many problems in the research, for example, the output power is too small because of the size of the energy collection device, and most devices have only one resonance frequency, and the frequency range is too small. Results in the application of single and inefficient energy collection. In order to solve the problems of low output power and narrow frequency range, a disk piezoelectric energy acquisition structure is proposed in this paper. In this paper, the working principle of piezoelectric energy collector is analyzed in detail, including the selection of material, the process of material converting vibration energy into electric energy, the analysis of piezoelectric cantilever model, and the analysis of electromechanical coupling theory of piezoelectric cantilever beam. It provides a theoretical basis for the design of the device. Then the ANSYS finite element model is used to simulate and analyze the performance of the device, and the influence of various parameters on the performance is studied. Finally, by studying the influence of various parameters on the performance of the device, the structure design of the device is optimized, and a new structure is designed to improve the output characteristics of the device and broaden the operating frequency range of the device.
【学位授予单位】：南京邮电大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM619

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