Piezoelectric energy harvesting from broadband random vibrations
Piezoelectric energy harvesting from broadband random vibrations
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DOI：
10.1088/0964-1726/18/11/115005
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发表时间：
2009-11-01
影响因子：
4.1
通讯作者：
Inman, D. J.
中科院分区：
文献类型：
--
作者：
Adhikari, S.;Friswell, M. I.;Inman, D. J.
用于为低功率电子传感器系统供电的能量收集在过去几年中受到了爆炸性的关注。大多数作品使用确定性的方法，集中在使用压电效应，以收获环境振动能量集中在悬臂梁共振使用谐波激励。在这里，使用随机方法，我们专注于使用堆栈配置和收获宽带振动能量，更实际的环境源。假设环境基本激励是平稳高斯白色噪声，其在所考虑的频率范围内具有恒定的功率谱密度。利用随机振动理论推导了压电振动能量采集器在随机激励下的平均功率。已经考虑了两种情况，即有和没有电感器的收获电路。精确的封闭形式的表达式，涉及机电系统的无量纲参数已经给出，并使用数值例子进行说明。
Energy harvesting for the purpose of powering low power electronic sensor systems has received explosive attention in the last few years. Most works using deterministic approaches focusing on using the piezoelectric effect to harvest ambient vibration energy have concentrated on cantilever beams at resonance using harmonic excitation. Here, using a stochastic approach, we focus on using a stack configuration and harvesting broadband vibration energy, a more practically available ambient source. It is assumed that the ambient base excitation is stationary Gaussian white noise, which has a constant power-spectral density across the frequency range considered. The mean power acquired from a piezoelectric vibration-based energy harvester subjected to random base excitation is derived using the theory of random vibrations. Two cases, namely the harvesting circuit with and without an inductor, have been considered. Exact closed-form expressions involving non-dimensional parameters of the electromechanical system have been given and illustrated using numerical examples.