A multiple-degree-of-freedom piezoelectric energy harvesting model
A multiple-degree-of-freedom piezoelectric energy harvesting model
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DOI：
10.1177/1045389x12449920
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发表时间：
2012-09-01
影响因子：
2.7
通讯作者：
Yang, Yaowen
中科院分区：
文献类型：
--
作者：
Tang, Lihua;Yang, Yaowen
传统的振动能量采集器通常是作为单自由度模型来研究的。这种采集器仅在接近唯一共振时有效的事实限制了它们在频率变化或随机振动情况下的适用性。提出了一种新型的多自由度压电能量采集模型。首先，分析了一个两自由度的模型，其两个配置的特点。在第一配置中，压电元件被放置在一个质量块和基部之间，并且在第二配置中，压电元件被放置在两个质量块之间。结果表明，前者是优于后者，因为与总重量的单自由度模型略有增加，我们可以实现两个接近的和有效的功率响应峰值或一个有效的峰值与显着增强的幅度。第一个配置，然后推广到一个n-度的自由度模型，并推导出其解析解。该解为多自由度压电能量采集模型的参数化研究和设计提供了方便的工具。最后，提出的n自由度压电能量收集模型的等效电路模型，通过机械和电气域之间的类比。利用该等效电路模型，可以进行系统级电气仿真，以评估系统在附加复杂接口电路时的性能。
Conventional vibration energy harvesters have been usually studied as single-degree-of-freedom models. The fact that such harvesters are only efficient near sole resonance limits their applicability in frequency-variant or random vibration scenarios. In this article, a novel multiple-degree-of-freedom piezoelectric energy harvesting model is presented. First, a two-degree-of-freedom model is analyzed, and its two configurations are characterized. In the first configuration, the piezoelectric element is placed between one mass and the base, and in the second configuration, it is placed between the two masses. It is shown that the former is advantageous over the latter since with a slight increase of overall weight to the single-degree-of-freedom model, we can achieve two close and effective peaks in power response or one effective peak with significantly enhanced magnitude. The first configuration is then generalized to an n-degree-of-freedom model, and its analytical solution is derived. This solution provides a convenient tool for parametric study and design of a multiple-degree-of-freedom piezoelectric energy harvesting model. Finally, the equivalent circuit model of the proposed n-degree-of-freedom piezoelectric energy harvesting model is developed via the analogy between the mechanical and electric domains. With the equivalent circuit model, system-level electric simulation can be performed to evaluate the system performance when sophisticated interface circuits are attached.