Multimodal piezoelectric devices optimization for energy harvesting
Multimodal piezoelectric devices optimization for energy harvesting
复制标题
用于能量收集的多模态压电器件优化
DOI：
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发表时间：
2013
期刊：
影响因子：
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通讯作者：
Leonardo Lorusso
中科院分区：
文献类型：
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作者：
G. Acciani;Antonietta Dimucci;Leonardo Lorusso
利用压电效应将环境振动转化为有用的电能是能量收集 (EH) 研究中研究最多的领域之一。本文提出了一种典型的悬臂式能量收集器装置，该装置可以轻松地将电输出与振动模态形状联系起来。压电陶瓷层中感应的动态应变会产生交流电压输出。前六种频率模式和梁的变形模式是根据 COMSOL Multiphysic® v3.5a 的 MEMS 模块进行的特征频率分析来进行的，以对模型进行有限元分析。随后，在拐点周围切割压电材料，以最大限度地减少材料中符号变化时发生的电压抵消效应。这项研究表明，设备产生的电压随着压电层中切口尺寸的变化而增加。这样的电压达到压电材料的最佳量并切断定位。这证明优化后的压电层比整个压电层的效率提高了16%。
The use of the piezoelectric effect to convert ambient vibration into useful electrical energy constitutes one of the most studied areas in Energy Harvesting (EH) research. This paper presents a typical cantilevered Energy Harvester device, which relates the electrical outputs to the vibration mode shape easily. The dynamic strain induced in the piezoceramic layer results in an alternating voltage output. The first six modes of frequencies and the deformation pattern of the beam are carried out basing on an eigenfrequency analysis conducted by the MEMS modules of the COMSOL Multiphysic® v3.5a to perform the Finite Element Analysis of the model. Subsequently, the piezoelectric material is cut around the inflection points to minimize the voltage cancellation effect occurring when the sign changes in the material. This study shows that the voltage produced by the device, increases in as the dimensions of the cuts vary in the piezoelectric layer. Such voltage reaches the optimum amount of piezoelectric material and cuts positioning. This proves that the optimized piezoelectric layer is 16% more efficient than the whole piezoelectric layer.