Investigation of bistable piezo-composite plates for broadband energy harvesting
Investigation of bistable piezo-composite plates for broadband energy harvesting
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DOI：
10.1117/12.2009101
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发表时间：
2013-04
期刊：
影响因子：
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通讯作者：
D. Betts;C. Bowen;H. A. Kim;N. Gathercole;C. Clarke;D. Inman
中科院分区：
文献类型：
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作者：
D. Betts;C. Bowen;H. A. Kim;N. Gathercole;C. Clarke;D. Inman
为无线传感器网络等小型电子元件供电的需求，引发了人们对能够从环境振动中产生电能的能源收集技术的兴趣。由于机械到电能转换的简单性以及与静电和电磁等效物相比，它们的应变能密度较高，因此对压电材料和器件的研究一直受到特别的关注。为了了解双稳态非对称层合板的动态响应和发电特性，本文研究了一种安装在双稳态非对称层合板上的压电元件的布置。底层结构固有的双稳态被用于能量采集，因为从一种稳定构型到另一种稳定构型的“快速穿透”被用来使粘结在层合板上的压电材料产生应变并产生压电能。利用高速数字图像相关技术，对双稳态收割机的各种动态振荡模式进行了识别。研究了这种振动模式对频率和振幅变化的敏感性。电功率输出是针对可重复的突击事件进行测量的，并与振荡模式相关。产生的典型功率约为25 mW，与典型无线传感器节点应用的需求相当。
The need to power small electronic components, such as wireless sensor networks, has prompted interest in energy harvesting technologies capable of generating electrical energy from ambient vibrations. There has been a particular focus 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. This paper describes research on an arrangement of piezoelectric elements attached to a bistable asymmetric laminate 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 'snap-through' from one stable configuration to another is used to strain the piezoelectric materials bonded to the laminate and generate piezoelectric energy. Using high speed digital image correlation, a variety of dynamic modes of oscillation are identified in the bistable harvester. The sensitivity of such vibrational modes to changes in frequency and amplitude are investigated. Electrical power outputs are measured for repeatable snap-through events and are correlated with the modes of oscillation. The typical power generated is approximately 25mW and compares well with the needs of typical wireless senor node applications.