压电等应变梁能量回收装置研究

Research on Uniform-strain Piezoelectric Energy Harvesting Mechanism

针对应变分布对悬臂梁能量回收装置输出的影响,提出一种变厚度等应变结构,并用多层金属片构成的阶梯梁对该理想等应变结构进行近似。制作了4层阶梯梁能量回收装置,其中能量转换压电片采用压电纤维复合物(MFC)。通过测量梁的应变分布和压电片输出,证明压电片能量在阶梯梁结构下是等截面梁结构下的2.89倍。

Based on a cantilever energy harvesting mechanism,the influence of the strain distribution of the cantilever beam on the performance of the piezoelectric element was investigated.A non-constant thickness beam was proposed and a stair-shaped beam was designed as an approximation.A stair-shaped beam was fabricated by bonding four copper alloy sheets together.Moreover,a macro fiber composite（MFC） was used as the piezoelectric element.The strain distribution of the beam and the corresponding output of the piezoelectric element were measured.It was proven experimentally that the electrical energy generated by the uniform-strain system was increased by a factor of 2.89 as compared to the uniform cross-section system.