含槽变截面悬臂式压电俘能器性能研究

Study on Performance of Variable-Sectional Cantilever Piezoelectric Energy Harvester with Groove

为了俘获更大的能量,提出了一种含槽变截面悬臂式压电俘能器。首先,梁形式采用给定的指数函数进行变化,并且在内部挖槽;其次,推导对应的振动方程,参考相关文献确定振型表达式,进而写出相应的特征方程,推导出电压和输出功率表达式,并根据电压和输出功率确定最优指数。结果表明,在保持梁长度不变的前提下,锥形梁的弯曲程度系数越大,则输出电压及功率越大,但系统的特征频率也将变大。

In order to capture more energy,a variable-sectional cantilever piezoelectric energy harvester with groove was proposed in this paper.Firstly,the beam form is changed according to a given exponential function,and the groove is dug inside the beam.Secondly,the corresponding vibration equation is deduced,and the expression of vibration mode is determined by referring to relevant literature,and then the corresponding characteristic equation is established,the expression of voltage and output power is derived,and the optimal exponent is determined according to the voltage and output power.The results show that under the premise of keeping the beam length unchanged,the larger the bending degree coefficient of the tapered beam,the larger the output voltage and power,but the larger the characteristic frequency of the system.