悬臂梁基底对压电俘能器输出响应的影响分析

Analysis of Influence of Cantilever Beam Substrate on Output Response of Piezoelectric Energy Harvester

悬臂梁的材料与结构对压电俘能器的输出响应具有重要影响。为了研究在1.5~5.8 m/s低风速环境下不同基底材料对接触式压电俘能器的影响,该文选择聚氯乙烯(PVC)、304不锈钢、1060铝和H68黄铜材料为基底的柔性聚偏氟乙烯(PVDF)压电悬臂梁结构,并进行了对比实验与分析。结果表明,以304不锈钢为基底的悬臂梁结构输出功率最大。通过计算不同基底材料梁的结构参数发现,在低风速工况下,梁的结构刚度与减幅因数是影响压电俘能器输出性能的主要因素。同等工况下,梁的结构刚度越小,接触式压电俘能器的启动风速越低,风致振动的激振力频率越高;减幅因数越小,悬臂梁的输出功率越大。

The material and structure of the cantilever beam have an important influence on the output response of piezoelectric energy harvester.In order to study the influences of different substrate materials on the contact piezoelectric energy harvesters under the low wind speed of 1.5~5.8 m/s.In this paper,the flexible PVDF piezoelectric cantilever beam structures with substrates of PVC,304 stainless steel,1060 aluminum and H68 brass are selected for comparative experiments and analysis.The results show that the output power of the cantilever structure based on 304 stainless steel substrate has the largest output power.Moreover,by calculating the structural parameters of beams with different substrate materials,it is found that the structural stiffness and amplitude reduction factor are the main factors affecting the output performance of piezoelectric energy harvester under low wind speed conditions.Under the same working conditions,when the structural stiffness of the beam is smaller,the starting wind speed of the contact piezoelectric energy harvester is lower,and the exciting force frequency of wind-induced vibration is higher.The smaller the amplitude reduction factor,the greater the output power of the cantilever beam.