摘要
为提高环境适应性和可靠性,提出一种基于组合换能器的磁耦合式压电振动发电机,该发电机由纵振的耦合器和横摆的组合换能器构成。建立了组合换能器和磁力的COMSOL有限元模型,并进行了仿真分析,获得了组合换能器簧片长度比、厚度比及磁铁间距对发电机输出性能的影响。在此基础上,选取较佳的结构参数(长度比为0.57、厚度比为2),设计制作了样机并进行了试验测试,获得了激励磁铁和受激磁铁间横向距离L_(x)、纵向距离L_(y)、竖向距离L_(z)及负载电阻对发电机输出性能的影响规律。结果表明:激励频率f<20 Hz时,存在两个较佳谐振频率(由小到大分别记为f_(n1)和f_(n2)),使输出电压出现峰值。谐振频率及其所对应的电压峰值均随L_(x),L_(y)及L_(z)的变化而变化,故合理选择激励磁铁和受激磁铁间距可降低f_(n1)、提高f_(n2)及增大输出电压,有效提高发电机的带宽和环境适应性。存在最佳负载电阻使发电机输出功率达到最大,f=11 Hz,R=540 kΩ时所获得的最大输出功率达0.19 mW。
To improve environmental adaptability and reliability of piezoelectric harvester,a magnetically coupled piezoelectric vibration energy harvester(PVEH)based on a combined transducer is proposed in this paper.The PVEH is mainly composed of a coupler subjected to longitudinal vibration and a combined transducer subjected to transverse oscillation.The finite element model of the combined transducer and magnetic force is established using the COMSOL software,and the simulation analysis is carried out.Thus,the influence of the reed length ratio,thickness ratio and magnetic distance of the combined transducer on the PVEH performance is obtained through the simulation.On this basis,an optimal structural parameter(length ratio of 0.57 and thickness ratio of 2)is chosen to make the prototype and the characteristic experiments are performed.The experimental results shows the influence of the transverse distance L_(x),longitudinal distance L_(y),vertical distance L_(z) of the exciting magnet and the excited magnet on the PVEH performance.When the excitation frequency f is less than 20 Hz,there are two natural frequencies(denoted as f_(n1)and f_(n2)respectively,f_(n1)<f_(n2)),corresponding to the peak output voltages.Both the natural frequencies and their corresponding peak voltages are changed with the values of L_(x),L_(y) and L_(z).It is demonstrated that the adjustment of magnetic distance could reduce the first natural frequency f_(n1),increase the second natural frequency f_(n2),enhance the output voltage,and effectively improve the bandwidth and environmental adaptability of the PVEH.The load characteristics show that the maximum output power of 0.19 mW is achieved under the optimal load resistance of 540 kΩ at the excitation frequency of 11 Hz for the PVEH.
作者
阚君武
王凯
王进
张忠华
费翔
王淑云
KAN Jun-wu;WANG Kai;WANG Jin;ZHANG Zhong-hua;FEI Xiang;WANG Shu-yun(Institute of Precision Machinery and Inelligent Structure,Zhejiang Normal University,Jinhua 321004,China;Key Laboratory of Urban Rail Transit Inelligent Operation and Maintenance Technology and Equipment of Zhejiang Province,Jinhua 321004,China)
出处
《振动工程学报》
EI
CSCD
北大核心
2022年第4期887-894,共8页
Journal of Vibration Engineering
基金
国家自然科学基金资助项目(51877199,52077201)
浙江省重点研发计划项目(2021C01181)
浙江省自然科学基金资助项目(LY20F010006)
国家级大学生创新创业训练计划(201810345037)。
关键词
磁耦合
组合换能器
间接激励
压电
振动发电机
magnetic coupling
combined transducer
indirect motivation
piezoelectric
vibration energy harvester
