梯形梁压电俘能器的特性研究

传统悬臂梁压电俘能器通常采用矩形梁结构,其压电片宽度为定值,对于压电片的利用效率有限。该文设计了一种梯形梁结构,将悬臂梁及其上附着的压电层设计为梯形,压电片宽度沿梁长方向逐渐变窄,并针对梯形梁结构的压电俘能器进行理论研究、仿真计算与实验分析,同时与传统矩形梁俘能器进行了对比。结果表明,同样的谐振状态下,梯形压电片中应力分布比矩形压电片中更均匀,且梯形梁压电俘能器具有更高的电压输出。

Study on the Characteristics of Trapezoidal Cantilever Piezoelectric Energy Harvester

The rectangular cantilever structure is widely used in conventional cantilever piezoelectric energy harvester, due to the width of the piezoelectric plate is constant, the utilization efficiency of the piezoelectric material is limited. A trapezoidal cantilever structure is designed in this paper, in which the cantilever and the piezoelectric layer adhering to it is designed to be trapezoidal. The width of piezoelectric layer is gradually narrowed along the beam length direction. The designed structure is analyzed by the means of theoretical analysis, simulation and experiment. And at the same time a comparison between rectangular cantilever piezoelectric energy harvester and trapezoidal cantilever piezoelectric energy harvester has been performed. The result shows that under resonant state, the stress distribution in trapezoidal piezoelectric layer is more uniform than that in the rectangular piezoelectric layer and trapezoidal cantilever piezoelectric energy harvester has a higher output voltage.