Long-term fatigue behavior of a cantilever piezoelectric energy harvester
Long-term fatigue behavior of a cantilever piezoelectric energy harvester
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DOI：
10.1177/1045389x16667552
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发表时间：
2017-05-01
影响因子：
2.7
通讯作者：
Soh, Chee Kiong
中科院分区：
文献类型：
--
作者：
Avvari, Panduranga Vittal;Yang, Yaowen;Soh, Chee Kiong
在过去的十年中，在新设计和新技术的进步中，压电能量收集引起了广泛的研究。悬臂形压电能量收集梁是最常用的设计之一，由于其简单和灵活性，进一步提高性能。悬臂式压电能量收集梁的应变分布是不均匀的，长期运行会引起悬臂梁根部的疲劳损伤。这一特殊问题在文献中很少被提及。本文对悬臂式压电能量收集梁在不同基底激励下的疲劳性能进行了实验研究。在实验研究的基础上，采用解析公式考察了应变水平，并采用有限元分析公式对带有宏纤维复合压电换能器的压电能量收集梁进行了建模。在三维模型的基础上建立了二维模型来研究压电能量收集梁的裂纹扩展。此外，采用机电阻抗技术对试件的损伤过程进行监测。从宏观光纤复合材料换能器中得到的阻抗值和电压的均方根偏差和相对均方根偏差为压电能量收集梁的损伤传播提供了深刻的反思。本研究通过分析输出电压、谐振频率、尖端位移、尖端速度和阻抗的变化，深入研究了均匀正弦基激励下压电能量收集梁在疲劳载荷下的行为。这将为今后基于疲劳的压电能量收集梁设计指南的研究铺平道路。
Piezoelectric energy harvesting has attracted extensive research in the advancement of new designs and techniques over the last decade. The cantilever shaped piezoelectric energy harvesting beam is one of the most employed designs, due to its simplicity and flexibility for further performance enhancement. The strain distribution along the cantilever piezoelectric energy harvesting beam is nonuniform, which would induce fatigue damage at the root of the cantilever on the long run. This particular issue has seldom been addressed in the literature. This article presents an experimental investigation on the fatigue behavior of a cantilever piezoelectric energy harvesting beam at different base excitation levels. The experimental study is augmented with analytical formulation to examine the strain levels and with finite element analysis formulation to model the piezoelectric energy harvesting beam with a macro fiber composite piezoelectric transducer. A two-dimensional model is developed based on the three-dimensional model to investigate crack propagation in the piezoelectric energy harvesting beam. Furthermore, the electromechanical impedance technique is employed to monitor the progression of damage in the experimental specimens. The root mean square deviation and relative root mean square deviation of the impedance values and voltage obtained from the macro fiber composite transducer provide a profound introspection into the damage propagation in the piezoelectric energy harvesting beam. This study provides an insight into the behavior of the piezoelectric energy harvesting beam undergoing fatigue loading due to a uniform sinusoidal base excitation by analyzing the output voltage, resonant frequency, tip displacement, tip velocity, and impedance variations. It will pave the way for future studies on the fatigue-based design guides for piezoelectric energy harvesting beams.