Reversible Nonlinear Energy Harvester Tuned by Tilting and Enhanced by Nonlinear Circuits
Reversible Nonlinear Energy Harvester Tuned by Tilting and Enhanced by Nonlinear Circuits
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DOI：
10.1109/tmech.2016.2530619
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发表时间：
2016-02
期刊：
影响因子：
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通讯作者：
Zhengbao Yang;J. Zu;Zhuo Xu
中科院分区：
文献类型：
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作者：
Zhengbao Yang;J. Zu;Zhuo Xu
非线性振动能够有效地扩展能量采集器的频带宽度。硬化或软化非线性已被用于各种设计中，以实现宽带能量收集。在本文中，我们提出了一种新的方法来实现可逆的滞回响应，即，硬化和软化非线性响应，机械上没有额外的磁相互作用。这种可调的非线性赋予能量采集器对环境的极大适应性。该能量采集器由一个弯曲中心和两个质量块组成，由一对固定在振动基座上的弹性杆支撑。通过以不同角度倾斜固定-固定弹性杆来引起不同的非线性响应。建立了非线性机电耦合系统的集总参数模型，并利用高阶摄动法进行了解析求解。在不同的频率和加速度下的动态响应进行了分析，其特征在于，并与从制造的原型测量的实验数据进行了比较。此外，一个非线性调理电路（自供电串联同步开关收获电感）的构建和测试与建议的非线性能量采集器，其性能提高约200%的电阻性负载和电容性负载。
Nonlinear vibration is capable of effectively extending the frequency bandwidth of energy harvesters. Either hardening or softening nonlinearity has been used in various designs to achieve broad-bandwidth energy harvesting. In this paper, we propose a new method to achieve reversible hysteretic responses, i.e., both hardening and softening nonlinear responses, mechanically without additional magnetic interactions. This tunable nonlinearity endows energy harvesters with a great adaptability to environment. The proposed energy harvester is composed of a flexural center and two mass blocks, supported by a pair of elastic rods that are fixed on a vibration base. Different nonlinear responses are invoked by tilting the fixed-fixed elastic rods at different angles. A lumped-parameter model is developed to simulate the nonlinear electromechanical coupling system, and that is analytically solved by virtue of the high-order perturbation technique. The dynamic responses under different frequencies and accelerations are analytically characterized and compared well with the experimental data measured from a fabricated prototype. Furthermore, a nonlinear conditioning circuit (self-powered series synchronized switch harvesting on inductor) is constructed and tested with the proposed nonlinear energy harvester, with which the performance is enhanced about 200% for both resistive loads and capacitive loads.