刚柔复合梁压电风能采集器的试验测试与分析

Test and analysis of piezoelectric wind energy harvester based on rigid-flexible composite beam

为满足弱风时微功率传感监测系统的自供电需求,提出一种由压电梁与其端部柔性梁构成的刚柔复合梁风能采集器,介绍了其结构及原理,并进行了理论分析与试验研究。结果表明,柔性梁厚度h2/长度l2、迎风角α及风速v对风能采集器输出电压Vg都有较大影响,各要素合理匹配可有效地提升发电能力。其它条件确定时,Vg与v（0-9.45m/s）呈较好的线性关系;存在最佳柔性梁长度l＊2和最佳迎风角α＊使输出电压最大（V＊g）,且随h2增加l＊2增加、V＊g降低,h2为0.1 mm/0.2 mm/0.3 mm时l＊2为45 mm/60 mm/150 mm、V＊g为57.6 V/39.2 V/33.6 V;h2对α＊影响不大,h2为0.1mm/0.2 mm/0.3 mm时的α＊均为35°左右。

To meet the energy demand of self-powered monitoring system under low-speed wind,a piezoelectric energy harvester（ PEH） was presented. The PEH was comprised of a rigid piezoelectric beam and a flexible beam strung together in series. The structure and principle of the PEH were introduced. The influential factors on the harvester properties were ananlysed and proof experiments were carried out. The results show that the thickness（h2） /length（l2） of the flexible beam,the attack angle（ α） and the wind velocity（ v） exert great influence on output voltage（Vg）,which can be improved effectively by reasonably matching the above parameters. With the other parameters given,Vgis in direct proportion to v（ 0- 9. 45 m / s）. There is an optimal length of the flexible beam（ l＊2） and an optimal attack angle（ α＊）for the PEH to achieve the maximal voltage（ V＊g）. With the increasing of h2,l＊2increases,and V＊gdecreases. Under h2= 0. 1 mm /0. 2 mm /0. 3 mm,l＊2 are equal to 45 mm /60 mm /150 mm and V＊ gare equal to 57. 6 V /39. 2 V /33. 6 V respectively. α＊remains almost the same（ 35°） with the increasing of h2 from 0. 1 mm to 0. 3 mm.