【作者】 赵林；

【导师】 崔岩；

【作者基本信息】 大连理工大学 ， 机械电子工程， 2012， 硕士

【摘要】 在面临能源紧缺的世纪,寻找和利用新型能源是各国面临的重大问题,在各种能量采集技术中,压电式能量采集技术已成为一个重要的研究领域并且发展迅速。人们对新型能源解决方案需求殷切,需要更省电的方式驱动微芯片,关键挑战是将压电材料所产生的电力放大,并且能够和低成本、小型化的系统进行整合。在众多的压电式能量采集技术当中,利用非线性技术可以获得宽频带和高的输出电压。在宏观结构压电式能量采集器的基础上,国内外很多学者开始关注并采用MEMS技术制作微能量采集器件。本文设计、制作和测试了两种结构的非线性压电式能量采集器,分别基于压电双晶片结构和压电微悬臂梁结构。介绍了相关背景知识,包括压电理论、非线性振动理论、压电式能量采集等,并且介绍了压电式MEMS能量采集器的制作工艺。在激振加速度为20m/s2时,基于压电双晶片的压电式能量采集器的最大输出电压峰值从65V提高到104V,最优输出功率约为0.48mW,其共振频率变化范围达到18Hz,得到结论,可以使用非线性技术小范围改变压电式能量采集器的共振频率,同时提高其输出电压。另外,对于非线性压电式MEMS能量采集器,在激振台的输入电压为7.2V时,压电式MEMS能量采集器的最大输出电荷为18pC,其输出电荷与同类型的线性压电式MEMS能量采集器相比提高了4倍,其最大输出功率为0.0106nW,并且得到结论,导致其输出电荷提高的主要因素是压电微悬臂梁所承受的弯矩。更多还原

【Abstract】 The world moves toward greater find and utilize of new type energy sources in this energy-shortage-century. Among of the various energy harvesting technologies, the piezoelectric energy harvester has emerged as a prominent research area and continues to grow at a rapid pace. With the drive for alternative energy solutions, people need to find more efficient ways to power microchips. The key challenge will be amplifying the electrical energy generated by the piezoelectric materials and enable them to be integrated into low-cost and compact structures. Using nonlinear techniques, the piezoelectric energy harvester can obtain a wide vibration frequency and a higher output voltage. Based on the macro-structure of piezoelectric energy harvesting device model, the fabrication of the micro-energy harvester using MEMS technology has been paying more attention by many researchers.The nonlinear piezoelectric energy harvesters were design and investigated, which were based on the bimorph and the piezoelectric micro-cantilever respectively. The relevant background knowledge was introduced, including the piezoelectric theory, the nonlinear vibration theory and the piezoelectric harvesting theory. The fabrication processes of the nonlinear piezoelectric MEMS energy harvester were presented.As the nonlinear piezoelectric energy harvester which was based on the bimorph. the maximum output peak voltage improved from65V to104V under vibration acceleration of20m/s\the maximum output power was about0.48mW, and the resonant frequency various range was18Hz, it obtained that the resonant frequency of the nonlinear piezoelectric energy harvester can be changed in the small scope, and the output voltage was improved too. However, the bending moment is the main factor that led the output charge improved for the piezoelectric MEMS energy harvester, which maximum output charge was18pC under input excitation voltage of7.2V, the maximum output charge was increased by four times compared to the similar case of the linear piezoelectric MEMS energy harvester, its output maximum power was0.0106nW.更多还原