Statistical quantification of DC power generated by bistable piezoelectric energy harvesters when driven by random excitations
Statistical quantification of DC power generated by bistable piezoelectric energy harvesters when driven by random excitations
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DOI：
10.1016/j.jsv.2018.11.032
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发表时间：
2019-03
影响因子：
4.7
通讯作者：
Chunlin Zhang;R. Harne;Bing Li;K. W. Wang
中科院分区：
文献类型：
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作者：
Chunlin Zhang;R. Harne;Bing Li;K. W. Wang
振动能量收集提供了利用转换的能量来实现自供电电子设备的突出潜力。为了满足电子和可充电电池在实际应用中对直流电压的需求，高性能的非线性电能采集器被认为与标准整流电路接口，以从类似环境的随机基础加速度中提取直流功率。为了给系统开发提供一套有效的设计准则，本研究提出了一种理论方法来表征白色噪声加速度下的平稳随机动态响应和能量收集性能。考虑到多个振动区域导致能量采集性能差异很大，提出了一种基于理论预测的系统能量概率密度函数（PDF）的状态概率估计方法，对随机振动处于跳穿或井内状态的稳态概率进行统计分类.通过研究基底加速度强度和系统参数对系统动态响应和采集直流功率的影响，揭示了低系统阻尼和合适的系统参数（如适中的耦合常数和负载电阻）可以获得高的能量采集性能。理论预测与数值模拟和实验结果进行了比较，以验证所提出的理论方法的有效性。
Vibration energy harvesting provides prominent potential on leveraging the converted energy to realize self-powered electronics. To satisfy the demand of electronics and rechargeable batteries for DC voltages in practical applications, the high-performing, nonlinear bistable energy harvesters are considered to be interfaced with standard rectifying electrical circuits to extract DC power from environment-like, random base accelerations. To lead to an effective and efficient set of design guidelines for system development, this research proposes a theoretical method to characterize the stationary stochastic dynamic responses and the energy harvesting performance under white noise accelerations. Considering that the bistable harvesters possess multiple vibration regimes which induce drastically different energy harvesting performances, a novel state-probability estimation approach is presented based on the theoretically predicted probability density function (PDF) of system energy to statistically classify the stationary probability of the stochastic vibrations being in the snap-through or intrawell states. Via investigating the effects of the base acceleration strength and system parameters on the dynamic responses and harvested DC power, it is revealed that high energy harvesting performance would be achieved via low system damping and suitable system parameters, such as moderate coupling constant and load resistance. The theoretical predictions are compared with numerical simulations and experimental results to validate the effectiveness of the proposed theoretical method.