涡激振动作用下压电悬臂梁俘能器的仿真分析

Simulation Analysis of Piezoelectric Cantilever Beam Capacitor under Vortex-Induced Vibration

为了研究涡激振动作用下压电能量收集器与流体域之间的相互作用关系,基于ANSYS仿真软件,建立流-固-压电三场耦合模型,对置于圆柱钝体后一个圆柱直径位置处的压电悬臂梁在风场中的发电情况进行数值仿真分析。仿真结果表明,在卡门涡街的作用下,压电悬臂梁因两侧压力不同而发生振动,压电悬臂梁所发出的电压趋近于正弦信号,最大电压值为20 V。同时,输出电压的相位与压电悬臂梁发生形变的相位一致,与涡街脱落的相位相差180°。该研究证明了仿真计算的可行性,为俘能器的设计提供了理论依据。

In order to study the interaction between the piezoelectric energy harvester and the fluid domain under vortex-induced vibration,a fluid-solid-piezoelectric three-field coupling model is established based on the ANSYS software.The energy harvester of the piezoelectric cantilever beam placed at the position of a cylindrical diameter behind the blunt body of the cylinder is simulated.The results show that under the action of Karman vortex street,the piezoelectric cantilever beam vibrates due to different pressures on both sides.The voltage generated by the piezoelectric cantilever beam approaches the sinusoidal signal,and the maximum voltage value is 20 V.At the same time,the phase of the output voltage is consistent with the phase of the deformation of the piezoelectric cantilever beam,and is 180°out of phase with the vortex shedding.This study verifies the feasibility of simulation calculation and provides a theoretical basis for the design of the energy harvester.