Uncertainty in performance for linear and nonlinear energy harvesting strategies
Uncertainty in performance for linear and nonlinear energy harvesting strategies
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DOI：
10.1177/1045389x12439639
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发表时间：
2012-09-01
影响因子：
2.7
通讯作者：
Owens, Benjamin A. M.
中科院分区：
文献类型：
--
作者：
Mann, Brian P.;Barton, David A. W.;Owens, Benjamin A. M.
振动能量收集器通常是线性质量弹簧阻尼器类型的设备，其谐振频率调整到其宿主环境的主要振动频率。因此，它们对不确定性高度敏感，这些不确定性可能源于宿主环境的不精确表征，或者源于制造缺陷和公差。此前有人声称，使用非线性能量收集器可能是缓解这些不确定性问题的一种方法。本文介绍了原型电磁能量收集器的系统不确定性传播研究。更具体地说，将存在参数不确定性的线性采集器的响应与包含一些常见形式的非线性（即硬化、软化或双稳态）的采集器的响应进行比较。分析解决方案与参数不确定性的假定水平结合使用，以量化功率输出中产生的不确定性。因此，这些研究可以确定参数空间中非线性策略可能优于更传统的线性方法的区域。
Vibrational energy harvesters are often linear mass-spring-damper-type devices, which have their resonant frequency tuned to the dominant vibration frequency of their host environment. As such, they can be highly sensitive to uncertainties, which may arise from the imprecise characterization of the host environment or, alternatively, from manufacturing defects and tolerances. It has previously been claimed that the use of nonlinear energy harvesters may be one way to alleviate the problems of these uncertainties. This article presents a systematic uncertainty propagation study of a prototypical electromagnetic energy harvester. More specifically, the response of a linear harvester in the presence of parametric uncertainty is compared to the response of harvesters containing some common forms of nonlinearity, that is, hardening, softening, or bistability. Analytical solutions are used in combination with presumed levels of parametric uncertainty to quantify the resulting uncertainty in the power output. Consequently, these studies can determine the regions in the parameter space where a nonlinear strategy may outperform a more traditional linear approach.