MEMS Vibrational Power Generator for Bridge Slab and Pier Health Monitoring
MEMS Vibrational Power Generator for Bridge Slab and Pier Health Monitoring
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DOI：
10.3390/app10228258
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发表时间：
2020-11
期刊：
影响因子：
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通讯作者：
K. Hashimoto;T. Shiotani;H. Mitsuya;Kai‐Chun Chang
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文献类型：
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作者：
K. Hashimoto;T. Shiotani;H. Mitsuya;Kai‐Chun Chang
基于微机电系统（MEMS）的微能量采集器（MEH）正在迅速发展，它提供了一种绿色的、几乎无限的能源。静电振动发电机振动时输出电能，促使我们将其应用于受环境和日常交通负荷激励的振动民用基础设施。在本研究中，提出了一种利用MEH装置检测桥梁结构板损伤和桥墩冲刷的创新监测系统。采用有限元模型对其性能进行了数值研究，其中板的损伤采用降低的杨氏模量和固定倾斜深度边界的冲刷来模拟。结果表明，由于损伤或冲刷作用，目标结构的模态频移和幅值发生变化，每个MEH产生的功率都会发生变化。提出了一种用于识别板损伤的发电指标，并引入了一种用于检测桥墩不均匀冲刷的无参考方法。利用基于静电振动的MEH （MEMS振动发电机），这项开创性的研究表明，MEMS振动发电机可以作为基础设施结构健康监测系统的传感器。
Micro energy harvesters (MEH) based on microelectromechanical systems (MEMS) are rapidly developing, providing a green and virtually infinite energy source. The electrostatic vibratory power generator outputs electric power when it vibrates, motivating us to apply it to vibrating civil infrastructures excited by ambient and daily traffic loadings. In this study, an innovative monitoring system utilizing MEH devices was proposed for detecting slab damage and pier scours for bridge structures. Its performance was numerically investigated with finite element models, where the damage in slabs was modeled with a reduced Young’s modulus and scours with fixed boundaries of inclined depth. It was shown that the powers generated at each MEH varied as the target structure’s modal frequency shifted and amplitude changed by damage or scour. A power generation index was proposed to identify slab damage and a reference-free method was introduced to detect uneven pier scours. Utilizing an electrostatic vibration-based MEH (MEMS vibrational power generator), this pioneering study showed that MEMS vibrational power generators can work as sensors for an infrastructure structural health monitoring system.