Nonlinear dynamics of a bistable piezoelectric-composite energy harvester for broadband application
Nonlinear dynamics of a bistable piezoelectric-composite energy harvester for broadband application
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DOI：
10.1140/epjst/e2013-01944-6
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发表时间：
2013-09-01
影响因子：
2.8
通讯作者：
Inman, D. J.
中科院分区：
文献类型：
--
作者：
Betts, D. N.;Bowen, C. R.;Inman, D. J.
近年来，对诸如无线传感器网络之类的小型电子部件的降低功率要求的持续需求促使人们对能够从环境振动捕获能量的能量收集技术重新产生兴趣。一个特别的焦点已经放在压电材料和设备由于简单的机械电能转换和它们的高应变能密度相比，静电和电磁等效。本文对非对称层合板上压电层的布置进行了实验研究，以了解结构的动力响应和发电特性。由于从一个稳定配置到另一个稳定配置的过渡，或“快速通过”，用于重复应变的表面结合的压电和产生电能，因此利用底层结构的固有双稳态进行能量收集。这种方法已被证明在很宽的振动频率范围内表现出高水平的功率提取。利用高速数字图像相关技术，在采集器中识别出各种动态振荡模式。这种模式的振动频率和振幅的变化的灵敏度进行了研究。针对装置的可重复快速通过事件测量功率输出，并且将功率输出与所测量的振荡模式相关联。所产生的典型功率约为3.2 mW，与典型无线传感器节点应用的需求相当。
The continuing need for reduced power requirements for small electronic components, such as wireless sensor networks, has prompted renewed interest in recent years for energy harvesting technologies capable of capturing energy from ambient vibrations. A particular focus has been placed on piezoelectric materials and devices due to the simplicity of the mechanical to electrical energy conversion and their high strain energy densities compared to electrostatic and electromagnetic equivalents. In this paper an arrangement of piezoelectric layers attached to a bistable asymmetric laminate is investigated experimentally to understand the dynamic response of the structure and power generation characteristics. The inherent bistability of the underlying structure is exploited for energy harvesting since a transition from one stable configuration to another, or "snap-through", is used to repeatedly strain the surface bonded piezoelectric and generate electrical energy. This approach has been shown to exhibit high levels of power extraction over a wide range of vibrational frequencies. Using high speed digital image correlation, a variety of dynamic modes of oscillation are identified in the harvester. The sensitivity of such modes to changes in vibration frequency and amplitude are investigated. Power outputs are measured for repeatable snap-through events of the device and are correlated with the measured modes of oscillation. The typical power generated is approximately 3.2 mW, comparing well with the needs of typical wireless senor node applications.