不同形状压电振子的振动发电行为研究  

Study on Vibration Energy Harvesting Behaviors of Piezoelectric Cantilevers with Different Geometries

作　　者：邓冠前[1] 陈仲生[1] 陶利民[1] 

机构地区：[1]国防科技大学机电工程与自动化学院,湖南长沙410073

出　　处：《压电与声光》2010年第3期440-443,446,共5页Piezoelectrics & Acoustooptics

基　　金：武器装备预研基金资助项目;国防基础科研基金资助项目;国家自然科学基金资助项目(50805142)

摘　　要：利用压电振子将环境振动能量转化为电能是无线传感器自供电领域的一个研究热点,而压电振子的几何形状是影响其振动发电的重要因素之一。该文针对矩形、梯形、三角形3种形状的压电振子,首先从理论上推导了它们的应变表达式,然后对3种压电振子分别进行了有限元建模和静力学仿真分析,最后进行了实验验证。仿真和实验结果表明,在相同条件下,三角形压电振子明显改善了应变分布,产生的电压最大,梯形压电振子次之,而矩形压电振子最小,可用于指导实际中压电振子结构形状的优化设计。Acquiring the electric energy from ambient environment vibrations for self-powering wireless sensors has been a research hot-spot based on piezoelectric vibrators and the geometry of a piezoelectric cantilever beam will greatly affects its vibration energy harvesting ability.As to three of rectangular,trapezoidal and triangular piezoelectric cantilevers,their strain formulations are deduced theoretically respectively in this paper.Then their finite element models and static simulating analysis are presented.In the end experiments are done to test the results.Simulation and experiment results demonstrate that under the same conditions using the triangular cantilever beams can improve the strain distribution and generate more voltage than the trapezoidal and rectangular,and the least is rectangular ones.Thus the proposed method can provide theoretical principles of optimal designing piezoelectric cantilever beams for vibration energy harvesting in practice.

关 键 词：压电振子 悬臂梁 振动能量捕获 有限元仿真 

分 类 号：TN384[电子电信—物理电子学] TB123[理学—工程力学]