Experimental validation of an impact off-resonance energy harvester
Experimental validation of an impact off-resonance energy harvester
复制标题
冲击非共振能量采集器的实验验证
DOI：
10.1140/epjst/e2019-800155-0
复制
发表时间：
2019
期刊：
影响因子：
--
通讯作者：
S. Adhikari
中科院分区：
文献类型：
--
作者：
G. Martínez;M. Friswell;H. Haddad Khodaparast;S. Adhikari
大多数压电能量收集研究都集中在开发工作在低频的非共振采集器上，尽管更高的频率可以产生更多的能量。此外，当激励频率远离共振时，传统的谐振采集器效率较低。由于在撞击过程中激发了高频，因此使用机械撞击有可能提高总体收获的能量。此外，冲击的存在降低了基本激励频率的影响和精确匹配谐振频率的要求。为了利用高频率响应，设计了一种冲击能量采集器，并进行了实验验证。收割机由一个悬臂梁组成，其基座上附着一个压电片，该压电片与一个坚硬的物体碰撞。利用有限元分析和赫兹接触定律对收割机进行了建模。该模型在实验室使用内部制造的演示器进行测试和验证。所得结果与实验数据吻合较好，为进一步优化收割机的几何形状和压电性能奠定了基础。
Most piezoelectric energy harvesting research has focused on developing on-resonance harvesters that work at low frequencies, even though higher frequencies can generate more power. In addition, conventional resonant harvesters have low efficiency when the excitation frequency is away from resonance. Using mechanical impacts has the potential to improve the overall harvested energy since high frequencies are excited during impacts. Also, the presence of impacts reduces the influence of the base excitation frequency and the requirement to exactly match the resonance frequency. To take advantage of the higher frequency response, an impact energy harvester is designed and validated experimentally. The harvester consists of a cantilever beam with a piezoelectric patch attached to its base which impacts with a stiff object. The harvester is modelled using finite element analysis and a Hertzian contact law. The model is tested and validated in the laboratory using an in-house manufactured demonstrator. Good agreement with the experimental data is obtained, setting the basis for future optimisation of the harvester geometry and piezoelectric properties.