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Influence of effective electrode coverage on the energy harvesting performance of piezoelectric cantilevers
Energy Conversion and Management ( IF 10.4 ) Pub Date : 2021-09-28 , DOI: 10.1016/j.enconman.2021.114758
Kun Hu 1, 2 , Bin Zhou 2 , Fei Wang 3 , Zhengbao Yang 4 , Min Wang 3
Affiliation  

Cantilevers are widely used for piezoelectric vibration energy harvesters (PEHs), thanks to the low resonance frequency and large mechanical strain under weak excitations. Electrode coverage optimization is essential for maximizing output power. In this study, bimorph cantilevers with segmented electrodes are developed to investigate the correlation between effective electrode coverage (EEC) and the harvesting behavior of piezoelectric cantilevers. A nonlinear electromechanical model is established using Hamilton's principle, numerically solved with the method of harmonic balance, and further validated by experimental measurements. Equivalent linear stiffness and equivalent mechanical damping ratio are firstly introduced for evaluating the equivalent effective electromechanical coupling coefficients and identifying strong and weak coupling harvesters. Both harvesters fabricated with and without proof mass behave mainly as strongly coupled systems and can obtain the maximum possible power at a very low EEC. Variation of EEC in higher range acquires almost constant maximum power on dramatically changing resistance. A comprehensive EEC design principle for acquiring the maximum output power is obtained for cantilevered PEHs. An optimal EEC obtaining the maximum effective electromechanical coupling coefficient is needed for acquiring the unique maximum power pick for weakly coupled harvesters, whereas a wide range of EEC can be used to maximize output power for harvesters those mainly behave as strongly coupled systems.



中文翻译:

有效电极覆盖率对压电悬臂梁能量收集性能的影响

由于低共振频率和弱激励下的大机械应变,悬臂被广泛用于压电振动能量收集器(PEH)。电极覆盖优化对于最大化输出功率至关重要。在这项研究中,开发了具有分段电极的双压电晶片悬臂,以研究有效电极覆盖率 (EEC) 与压电悬臂的采集行为之间的相关性。利用哈密顿原理建立非线性机电模型,用谐波平衡法进行数值求解,并通过实验测量进一步验证。首先引入等效线性刚度和等效机械阻尼比来评价等效有效机电耦合系数和识别强弱耦合收割机。带有和不带有检测质量的两种采集器都主要表现为强耦合系统,并且可以在非常低的 EEC 下获得最大可能的功率。更高范围内的 EEC 变化在急剧变化的电阻上获得几乎恒定的最大功率。对于悬臂式 PEH,获得了获得最大输出功率的综合 EEC 设计原则。获得最大有效机电耦合系数的最佳 EEC 需要为弱耦合采集器获得唯一的最大功率选择,

更新日期:2021-09-29
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