Design of flexible piezoelectric gyroscope for structural health monitoring
Design of flexible piezoelectric gyroscope for structural health monitoring
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DOI：
10.1063/1.5126409
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发表时间：
2019-12-09
影响因子：
4
通讯作者：
Sepulveda, Nelson
中科院分区：
文献类型：
--
作者：
Cao, Yunqi;Sepulveda, Nelson
本文报告了一种基于四个相同柔性压电传感器互补设计的压电弯曲传感器结构，并进行了理论分析和实验论证。本文用于传感的活性材料是一种柔性铁驻极体聚合物，它具有具有分布捕获电荷的细胞内部结构。通过改变弯曲时的永久宏观偶极矩，观察到横向压电效应。结果表明，该传感器的电压输出与弯曲曲率呈线性关系。角位移是通过监测一根杆上四个正交装置的输出来确定的。不同类型的表面应力也可以通过测量反平行电连接的输出极性来确定。在这项工作中提出的传感器配置能够通过测量二维弯曲向量来提供结构健康的无损评估。
This Letter reports a piezoelectric bending sensor configuration based on a complementary design of four identical flexible piezoelectric sensors using both theoretical analysis and experimental demonstration. The active material used here for sensing is a flexible ferroelectret polymer, which possesses a cellular internal structure with distributed trapped charges. The transverse piezoelectric effect is observed by changing the permanent macroscaled dipole moments upon bending. It has been found that the voltage output for the sensor is linearly related to the bending curvature. Angular displacement is determined by monitoring the output of four orthogonal devices on a rod. Different types of surface stress can also be determined by measuring output polarities from an antiparallel electrical connection. The proposed sensor configuration in this work is capable of providing a nondestructive evaluation of structural health by measuring a 2D bending vector.