Li Xue, Sun Jun-Yi, Shi Bin-Bin, Zhao Zhi-Hang, He Xiao-Ting
School of Civil Engineering, Chongqing University, Chongqing 400045, China.
Key Laboratory of New Technology for Construction of Cities in Mountain Area (Chongqing University), Ministry of Education, Chongqing 400045, China.
Polymers (Basel). 2020 Sep 18;12(9):2133. doi: 10.3390/polym12092133.
This study is devoted to the design of an elastic polymer thin film-based capacitive wind-pressure sensor to meet the anticipated use for real-time monitoring of structural wind pressure in civil engineering. This sensor is composed of four basic units: lateral elastic deflection unit of a wind-driven circular polymer thin film, parallel plate capacitor with a movable circular electrode plate, spring-driven return unit of the movable electrode plate, and dielectric materials between electrode plates. The capacitance of the capacitor varies with the parallel move of the movable electrode plate which is first driven by the lateral elastic deflection of the wind-driven film and then is, after the wind pressure is reduced or eliminated, returned quickly by the drive springs. The closed-form solution for the contact problem between the wind-driven thin film and the spring-driven movable electrode plate is presented, and its reliability is proved by the experiment conducted. The numerical examples conducted show that it is workable that by using the numerical calibration based on the presented closed-form solution the proposed sensor is designed into a nonlinear sensor with larger pressure-monitoring range and faster response speed than the linear sensor usually based on experimental calibration.
本研究致力于设计一种基于弹性聚合物薄膜的电容式风压传感器，以满足土木工程中结构风压实时监测的预期用途。该传感器由四个基本单元组成：风驱动圆形聚合物薄膜的横向弹性挠曲单元、带有可移动圆形电极板的平行板电容器、可移动电极板的弹簧驱动复位单元以及电极板之间的介电材料。电容器的电容随可移动电极板的平行移动而变化，可移动电极板首先由风驱动薄膜的横向弹性挠曲驱动，然后在风压降低或消除后，由驱动弹簧快速复位。给出了风驱动薄膜与弹簧驱动可移动电极板之间接触问题的闭式解，并通过实验验证了其可靠性。数值算例表明，利用基于所提出的闭式解的数值校准，将所提出的传感器设计成一种非线性传感器是可行的，该非线性传感器比通常基于实验校准的线性传感器具有更大的压力监测范围和更快的响应速度。
