以航天器中结构的形态感知与可视化重构为研究背景,提出了一种基于准分布光纤光栅传感器网络的板状结构变形监测系统和坐标转换曲面重构算法。首先利用ABAQUS有限元分析软件对四边固支平板结构中心点加载的变形状态进行仿真分析,确定了光纤光栅传感器的位置;研究并分析了光纤光栅的应变检测原理以及基于坐标变换的三维曲面重构算法;最终搭建了一套变形检测系统并进行了相关实验。结果表明,测量点变形量的均方根误差≤0.04 mm,相对误差≤3.5%,该系统可用于航天器板状结构的变形监测。

Taking the shape perception and visualization reconstruction of the structure in the spacecraft as the research background, a plate-shaped structure deformation monitoring system based on a quasi-distributed fiber Bragg grating sensor network and a coordinate conversion surface reconstruction algorithm are proposed. First, the finite element analysis software ABAQUS is used to simulate and analyze the deformation state of the four-side fixed plate structure, and the position of the fiber grating sensor is determined. Then, the strain detection principle of the fiber Bragg grating and the three-dimensional surface reconstruction algorithm based on coordinate transformation are studied and analyzed. Finally, a set of deformation detection systems is built, and relevant experiments are carried out. The results show that the root mean square error of the shape variable of the measured point is no more than 0.04 mm, and the relative error is no more than 3.5%. The system can be applied to the deformation detection of the plate structure in the spacecraft.