基于模态法的形变重构技术应用研究

Research on Deformation Reconstruction Technology Based on Modal Method

针对相控阵雷达领域天线阵面结构实时变形监测的需求,研究了基于模态法的应变测量形变重构方法。该方法采用光纤光栅传感器测量面板表面应变,通过模态理论实现应变–位移的转换,重构出反射面形貌。文中以某相控阵雷达实验平台为研究对象,通过有限元软件提取其模态位移矩阵和模态应变矩阵,计算获得应变–位移转换矩阵。通过实验测量,提取了多种工况下面板的应变值,采用模态法进行了反射面形貌重构,对重构结果和实际位移值进行了比对与分析。结果表明,模态法形变重构可以较为准确地重构反射面变形。

A method of strain measurement and deformation reconstruction based on modal method is investigated in view of the needs of real-time deformation monitoring of antenna array structure in the field of phased array radar.This method uses fiber Bragg grating sensors to measure the surface strain of the panel and realizes the conversion from strain to displacement through modal theory,and the shape of the reflection surface is reconstructed.Taking a phased array radar experimental platform as the research object,its modal displacement matrix and modal strain matrix are extracted by finite element software,and the strain-displacement conversion matrix is calculated.Through experimental measurement,the panel strain values under various working conditions are extracted,and the shape of the reflection surface is reconstructed by modal method.The reconstruction results are compared and analyzed with the actual displacement values.The results show that the modal method can relatively accurately reconstruct the deformation of the reflection surface.