一种涡致振动压电发电结构的仿真与实验分析

Simulation and Experimental Analysis of a Vortex Induced Vibration Piezoelectric Power Generation Structure

提出了一种新型的压电发电装置,将双压电片悬臂梁沿轴向放入柔性轻质圆管内部,圆管立于流体内,轴向与来流方向垂直,圆筒内悬臂梁平面与来流方向平行。该结构可利用流体绕流圆管时产生的涡致振动驱动圆管在垂直于来流方向产生有规律的弯曲振动,从而带动压电悬臂梁产生周期性振动,进而产生电压。首先进行数学建模分析,得到了振动响应曲线。通过在ADINA中对该结构的流固双向耦合仿真分析得到了涡致振动导致的悬臂梁位移变化曲线,其与数学分析得到的振动响应曲线基本一致。然后利用ANSYS将得到的悬臂梁最大位移(1.1×10-4 m)作为初始条件,进行了压电耦合仿真,得到了压电片上的电压分布曲线,其中最大电压为2.431 V。在此基础上采用Multisim软件进行了能量收集电路仿真,得到了能量转换效率为37.92%。最后进行实验测试,得到了发电结构的输出电压曲线,实测值与仿真结果比较接近。

A new piezoelectric power generation device was proposed.The piezoelectric cantilever beam was placed in the flexible lightweight round tube along the axial direction.The tube was in the fluid,and the axial direction was perpendicular to the direction of the flow.The plane of the cantilever beam in the cylinder was parallel to the flow direction.The structure can generate the regular bending vibration of the tube in the direction perpendicular to the flow direction by using the vortex induced vibration of the fluid flowing around the circular tube,thus driving the piezoelectric cantilever to produce periodic vibration,and then generate voltage.Firstly,the vibration response curve was obtained by mathematical modeling analysis.By analyzing the fluid structure interaction of the structure in ADINA,the displacement curve of the cantilever beam caused by the vortex induced vibration was obtained,which was basically consistent with the vibration response curve obtained by the mathematical analysis.Then,the piezoelectric coupling simulation was carried out by using the maximum displacement（1.1 x10-4 m）of the cantilever beam as the initial condition obtained by ANSYS,and the voltage distribution curve of the piezoelectric chip was obtained.The maximum voltage was 2.431 V.On this basis,the Multisim software was used to simulate the energy collection circuit,and the energy conversion efficiency was 37.92%.Finally,the output voltage curve of the power generation structure was obtained by the experimental test,and the measured value was close to the simulation results.