Improving the performance of a two-sided vibro-impact energy harvester with asymmetric restitution coefficients
Improving the performance of a two-sided vibro-impact energy harvester with asymmetric restitution coefficients
复制标题
DOI：
10.1016/j.ijmecsci.2021.106983
复制
发表时间：
2022-01-10
影响因子：
7.3
通讯作者：
Yurchenko, Daniil
中科院分区：
文献类型：
--
作者：
Dulin, Sam;Lin, Kailee;Yurchenko, Daniil
研究了双边碰撞振动能量采集器（VI-EH）模型中非对称恢复系数的影响，考虑了能量输出的动力学行为和影响.在VI-EH中，球在强制圆柱体内自由移动，并与两端的顺应性介电聚合物碰撞，从而将运动转换为输出电压。我们开发（半）分析结果为1：1周期性的解决方案，与交替的影响两端，专注于非对称的恢复系数的情况下的顶部和底部的圆柱体。新类型的1：1周期解被发现，与能量输出明显不同于对称设置。该分析涵盖了非直观的结果，包括非单调依赖的能量输出的非对称恢复系数。我们发现意想不到的参数范围与改进的能量输出水平，以及稳定性结果表明，这种输出是强大的参数波动或外部扰动。此外，通过识别参数组合，通过不对称性限制性能，我们展示了如何不对称的恢复系数可以抵消这些不利影响。分析是基于映射的动态之间的影响，导致一系列的条件稳定的1：1周期性的解决方案的系统参数。我们比较了稳定性和分岔结构得到的解析和数值。分析表明，不同的行为，可能无法捕获的数值方法之间的双稳定性的可能区域。
We study the influence of asymmetric restitution coefficients in a model of a two-sided vibro-impact energy harvester (VI-EH), considering the dynamical behavior and the implications for energy output. In the VI-EH, a ball moves freely within a forced cylinder and collides with a compliant dielectric polymer on either end, thus converting the motion into output voltage. We develop (semi-)analytical results for 1:1 periodic solutions, with alternating impacts on either end, focusing on the case of asymmetric restitution coefficients on the top and bottom of the cylinder. New types of 1:1 periodic solutions are found, with energy output clearly different from the symmetric setting. The analysis covers non-intuitive results, including the non-monotonic dependencies of the energy output on the asymmetric restitution coefficients. We find unexpected parameter ranges with improved levels of energy output, as well as stability results indicating that this output is robust to parameter fluctuations or external perturbations. Furthermore, by identifying parameter combinations that limit performance through asymmetries, we show how asymmetric restitution coefficients can counteract these detrimental effects. The analysis is based on maps for the dynamics between impacts, leading to a series of conditions for stable 1:1 periodic solutions in terms of the system parameters. We compare stability and bifurcation structure obtained analytically and numerically. The analysis shows possible regions of bi-stability between different behaviors that may not be captured by numerical approaches.