折叠梁式振动能量采集器的设计  

Design of Energy Harvester Based on Folded Beams

作　　者：王海 史宁 张丽 杨春来 郑衍畅 文莉[2] WANG Hai;SHI Ning;ZHANG Li;YANG Chunlai;ZHENG Yanchang;WEN Li(School of Mechanical and Automotive Engineering,Anhui Polytechnic University,Wuhu Anhui 241000,China;University of Science and Technology of China,Hefei Anhui 231000,China)

机构地区：[1]安徽工程大学机械与汽车工程学院,安徽芜湖241000 [2]中国科学技术大学,安徽合肥230000

出　　处：《传感技术学报》2020年第9期1246-1253,共8页Chinese Journal of Sensors and Actuators

基　　金：国家自然科学基金项目(51275001,51375469,11705001);安徽省自然科学基金项目(1708085ME105,1808085QA12);安徽省教育促进计划科研总项目(TSK2015B04)。

摘　　要：单自由度压电能量采集器因其结构特点,其有效工作频带范围较窄,难以在实际的无线传感器网络节点和可穿戴设备等领域应用。本文提出一种基于折叠梁结构的压电振动能量采集器,以提高采集器的工作带宽。首先,对折叠梁式振动能量采集器进行理论建模及有限元分析,其次,分析不同质量块的质量对所提出的能量采集器的影响,最后,对所提出的能量采集器进行实验研究,实验结果表明,在频域为0~100 Hz,加速度为0.3 g的条件下,"L"型振动能量采集器的工作带宽为1 Hz,"Z"型振动能量采集器的工作带宽为3 Hz,扩增为"L"型带宽的300%,其次,"Z"型振动能量采集器在0.2 gn,0.25 gn,0.30 gn激励下的最佳匹配负载电阻分别为0.21 MΩ,0.27 MΩ以及0.21 MΩ,最大输出功率为509.122 mW,921.926 mW以及1331.230 mW,初步验证了折叠梁式能量采集器的性能。本文所提出的折叠梁式能量采集器可以兼顾降低谐振频率和增加低频段的谐振阶数的需求,有效提高了能量采集效率,为待供能设备提供充足的电能。Due to its structural characteristics,the single-degree-of-freedom piezoelectric energy harvester has a narrow effective operating frequency band range,which makes it difficult to be applied in practical wireless sensor network nodes and wearable devices.This paper proposes a piezoelectric vibration energy harvester based on a folded beam structure to improve the working bandwidth of the harvester.The theoretical model of the harvester was set up and simulated with the finite element analysis.The influence of the parameters of the harvester can be deduced from the above simulation.The experimental test system for the harvester was developed.Experimental results shows that the effective operation bandwidth of the"L"-type and"Z"-type structure were 1 and 3 Hz,respectively.The maximum output power of the"Z"-type structure is 509.122 mW,921.926 mW and 1331.230 mW,under 0.2 gn,0.25 gn,0.3 gn resonant frequency excitation respectively,which verified the improvement of the folded beam vibration energy harvester.The folded beam energy harvester proposed in this paper can meet the requirements of reducing the resonance frequency and increasing the resonance order of the low frequency band,which effectively improves the energy harvesting efficiency and provides sufficient power for the equipment to be powered.

关 键 词：谐振频率 谐振阶数 压电能量采集器 折叠梁 

分 类 号：TN384[电子电信—物理电子学]