Vibration energy harvesting system with coupled bistable modules
Vibration energy harvesting system with coupled bistable modules
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DOI：
10.1117/12.2513933
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发表时间：
2019-03
期刊：
影响因子：
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通讯作者：
P. Dorin;Jin-Ki Kim;Kon-Well Wang
中科院分区：
文献类型：
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作者：
P. Dorin;Jin-Ki Kim;Kon-Well Wang
双稳态振动能量采集器已经被用于在宽的频率带宽上实现强的能量采集性能。能量采集器的性能取决于外部激励是否足够大以超过高能量的最小阈值或“快速通过”振荡。研究表明，通过辅助单元降低势能势垒是确保实现高能轨道的有效方法。最近的进展已经表明，直接从用于动态降低可再生能源采集器的势垒的辅助单元提取能量可以提高性能。然而，仍然存在通过将非线性并入辅助收集元件来进一步改进的未探索的机会。因此，为了推进现有技术，本研究介绍了一种由磁耦合到辅助非线性收集元件的悬臂梁收集器组成的能量收集系统。对系统势能的分析表明，耦合的收获元件的附加非线性特性可以使得能够定制势能分布，使得可以实现四稳态或多方向双稳态。所提出的设备的准静态势能轨迹的调查表明，通过考虑非线性收获单元的有效线性刚度，稳定状态的数量，势能势垒的高度，和快速通过振幅都可以定制。系统动力学的数值模拟表明，额外的非线性纳入耦合系统提高了宽带收获性能。
Bistable vibration energy harvesters have been used to achieve strong energy harvesting performance over a wide frequency bandwidth. Performance of bistable energy harvesters is dependent on whether the external excitation is large enough to surpass the minimum threshold to high energy, or ‘snap through’ oscillations. Studies have indicated that lowering the potential energy barrier via an auxiliary unit is an effective way to ensure that high energy orbits are achieved. Recent advancements have shown that directly extracting energy from an auxiliary unit used to dynamically lower the potential barrier of a bistable energy harvester can enhance performance. However, there remains an unexplored opportunity for further improvement by incorporating nonlinearity into the auxiliary harvesting element. Thus, to advance the state of the art, this research introduces an energy harvesting system composed of a bistable cantilever harvester magnetically coupled to an auxiliary nonlinear harvesting element. An analysis of the system potential energy indicates that the additional nonlinear characteristics of the coupled harvesting element can enable tailoring of the potential energy profile such that quad-stability, or multi-directional bistability, can be achieved. Investigation of the quasi-static potential energy trajectory of the proposed device indicates that the number of stable states, height of the potential energy barrier, and snap through amplitude may all be tailored through consideration of the effective linear stiffness of the nonlinear harvesting unit. Numerical simulations of the system dynamics indicate that the additional nonlinearity incorporated into the coupled system improves broadband harvesting performance.