面向负载功率的压电悬臂梁研究

基于电路负载阻抗匹配原理,为最大程度利用压电悬臂梁发电装置收集环境振动能量,保证压电悬臂梁外接负载能够正常工作,需要研究压电悬臂梁结构参数对其最佳输出功率以及相对应外接负载匹配阻值的影响。该文通过压电电路分析,研究了基板和压电陶瓷片的长度、厚度、宽度和质量块质量对压电悬臂梁最佳输出功率以及相对应负载匹配阻值的影响。结果表明,一定范围内,增加基板长度、压电陶瓷片厚度、质量块质量可以增加压电悬臂梁外接负载匹配阻值,增加基板厚度、压电陶瓷片长和宽可降低压电悬臂梁外接负载匹配阻值;随着基板长度、压电陶瓷片宽和长、质量块质量的增加,压电悬臂梁最佳输出功率得到显著提高,基板宽度对压电悬臂梁最佳输出功率基本无影响,增加压电陶瓷片的厚度,压电悬臂梁最佳输出功率先增加后降低,存在一个最佳输出功率。

Research on Piezoelectric Cantilever Beam for Load Power

In order to maximize the use of piezoelectric cantilever beam generator for collecting environmental vibration energy and ensure that the piezoelectric cantilever beam external load can work properly based on the principle of circuit load impedance matching, it is necessary to study the effect of the structure parameters of the piezoelectric cantilever beam on its optimal output power and the corresponding external load matching resistance. In this paper, the influences of the length, thickness, width and mass quality of the substrate and the piezoelectric ceramic piece on the optimal output power of the piezoelectric cantilever beam and the corresponding load matching resistance are studied by means of piezoelectric circuit analysis. The results show that the external load matching resistance of the piezoelectric cantilever beam can be increased significantly with the increase of the length of the substrate, the thickness of the piezoelectric ceramic piece and the quality of the mass within a certain range, and the external load matching resistance of piezoelectric cantilever beam can be reduced significantly with the increase of the thickness of the substrate, the length of the piezoelectric ceramic piece and the width of the piezoelectric ceramic piece. With the increase of the length of the substrate, the width and length of the piezoelectric ceramic piece, and the quality of the mass, the output power of the piezoelectric cantilever beam is improved significantly, the width of the substrate has no effect on the output power of the piezoelectric cantilever beam, with the thickness of the piezoelectric ceramic piece increasing, the optimum power of the piezoelectric cantilever beam increased first and then decreased, and there is a maximum optimal output power.