Rainbow型压电换能结构的有限元分析与实验

摘要

A designing structure which can harvest multi-direction vibration energies was proposed by using the new Rainbow shape piezoelectric energy transferring elements. In order to analysis and test the electricity generation of the piezoelectric energy transferring elements, the finite element analysis and practical tests were performed. The simulation results indicate that the open circuit voltage of Rainbow shape piezoelectric energy transferring elements will be reduced with the increases of the width and thickness of a metal substrate, the width and length of a piezoelectric film and the initial curvature radii of energy transferring elements; and it will be increased with the increase of the length of the metal substrate and shows a maximum with the increase of the thickness of piezoelectric film.The experimental result demonstrates the validity of finite element analysis and emphasizes that the open circuit voltage of energy transferring elements will have a maximum when the thickness of piezoelectric film is 0. 25 mm. Furthermore,in the output power tests,the maximal output power of Rainbow shape piezoelectric energy transferring elements is about 7.75 μW. The results of simulation and experiment provide helps for designing, manufacturing and realizing the Rainbow shape piezoelectric energy transferring elements.%提出了一种换能部分采用新颖的Rainbow型压电结构的多方向振动能量收集装置.为了分析和测试Rainbow型压电换能结构的发电性能,对该装置进行了有限元分析和实验测试.有限元分析表明,金属基片的宽度与厚度、压电薄膜的宽度与长度及换能结构初始曲率半径的增大会引起换能结构输出开路电压的降低;金属基片长度的增大会引起换能结构输出开路电压的增加;压电薄膜厚度的增大会使得换能结构输出开路电压先增加后减小.实验显示,有限元分析与实验结果具有较好的一致性,且都在压电薄膜厚度为0.25 mm时换能结构的输出电压最大,得到的结果验证了有限元分析的可靠性.另外,在输出功率测试中,换能结构的输出功率达到了7.75μW.分析及测试结果为Rainbow型压电换能结构的设计、制作提供了指导性意见.