【作者】 房目稳；

【导师】 谢涛；

【作者基本信息】 哈尔滨工业大学 ， 机械电子工程， 2010， 硕士

【摘要】 随着MEMS、微电子等低耗能电子产品的广泛应用,对便携式、移动式电源的需求越来越强烈,而以传统的化学电池为这些微电子器件供能存在许多明显的弊端,如体积大、供能寿命有限、需要定期更换等。为解决这个问题,人们开始致力于研究从环境中吸取能量并转化为电能的方法。基于压电能量转换的压电俘能器具有能量密度大、结构简单、能耗低、易微型化等优点,因此具有非常广阔的应用前景。以往对压电俘能器的研究,要么集中对压电俘能器中压电振子结构进行优化研究,要么集中对压电储能电路进行研究,而都没有将压电振子结构与储能电路耦合起来分析,同时压电俘能器现主要有两种典型的结构形式:悬臂梁式和圆盘式,因此本文将以典型的悬臂梁和圆盘式压电俘能器为研究对象,将压电振子结构与储能电路耦合起来分析,针对其发电性能的数学建模和仿真分析展开研究。本文首先针对悬臂梁式压电俘能器进行研究,利用弹性力学与压电理论建立压电振子结构与能量存储电路耦合作用的发电性能数学模型,并在该模型的基础上分析压电振子主要结构参数、压电材料参数和负载对压电俘能器输出性能的影响关系,为悬臂梁式压电俘能器的结构设计与优化提供理论研究。在理论分析的基础上,建立悬臂梁式压电俘能器的机电耦合作用有限元仿真分析模型,分析压电振子主要结构参数、压电材料参数和负载对压电俘能器输出性能的影响关系,验证理论模型的正确性。最后,本文对带中心质量的圆盘式压电俘能器进行研究,利用理论弹性力学与压电理论建立圆盘式压电俘能器输出性能的数学模型,分析压电俘能器在串联与并联连接两种情况下,压电振子振动频率和负载对压电俘能器低频时输出性能的影响关系,同时利用有限元方法建立圆盘式压电俘能器机电耦合作用分析模型,仿真验证理论模型的正确性。更多还原

【Abstract】 With using MEMS, micro-electronics and other low power electronic products more convenience, the need for portable, mobile power is more strongly. Many drawbacks of the traditional chemical battery which can not be ignored, such as big size, large quality, limited lifespan, periodic replacement. People begin to study the method that can harvest energy from environment and convert to electricity. The energy harvester based on piezoelectric has many advantages, such as big energy density, simple structure, low energy consumption, easy miniaturization, so it is very broad application prospects. Previous research on piezoelectric energy harvester, either focus on the piezoelectric structure optimization, or focus on energy storage circuit, they are ignored the coupling of the piezoelectric structure and storage circuit. There are two main forms of piezoelectric structures: cantilever and disc pattern, in this article two kinds of energy harvester will be studied, the coupling of the piezoelectric structure and storage circuit will be considered. Their mathematical model and simulation for power generation performance will be studied.In this paper, cantilever energy harvester is firstly studied. Using theory of elasticity and piezoelectric established piezoelectric structure and energy storage circuit coupled mathematical model of power generation performance, and based on the model analyze the impact of main structural parameters, piezoelectric material parameters and load on energy harvester’s output performance, for the cantilever piezoelectric energy harvester structure design and optimization provide a theoretical study.Based on theoretical analysis, the electro-mechanical coupling finite element simulation model of cantilever piezoelectric energy harvester is established. Use the model analyze the impact of main structural parameters of the energy harvester, piezoelectric material parameters and load on energy harvester’s output performance, Verify the correctness of theoretical model.Finally, disc piezoelectric energy harvester with a central-attached mass is studied, Using theory of elasticity and piezoelectric established the coupled mathematical model of power generation performance, Use the model analyze the impact of frequency and load on energy harvester’s output performance in both series connection and parallel connection, at the same time, the electro-mechanical coupling finite element simulation model of disc piezoelectric energy harvester is established, simulation verify the correctness of theoretical model.更多还原