单端固支铝合金结构应变监测与反演方法

Study on Strain Monitoring and Inversion Method for Single Ended Fixed Supported Aluminum Alloy Structure

针对直升机主承力结构,如桨叶关键区域应力应变场监测需求,研究相应分布式在线监测技术及其应变场反演方法,从而为直升机结构健康状态评估与结构变形实时辨识提供依据。借助Patran/Nastran仿真软件分别对单端固支铝合金梁与板结构进行有限元仿真,给出基于光纤光栅传感器与电阻应变式传感器的基本配置规则,提出了基于三次B样条函数插值算法的单端固支铝合金结构应变场反演方法。在此基础上,构建了基于光纤布拉格光栅和电阻应变片的分布式应变在线监测系统。研究表明,本文监测方法合理、可行。

According to the demand of stress and strain field monitoring on the key area of main bearing structure of helicopter, it is necessary to study the corresponding distributed on-line monitoring technol- ogy and its strain field inversion method, so as to provide the assessment reference for structure health state and the real-time identification of the structure deformation of helicopter rotor blades. The finite element simulations of the single ended fixed supported aluminum alloy beam and plate structure are car- ried out by Patran/Nastran simulation software. The basic configuration rules of fiber Bragg grating sensor and resistance strain sensor are presented, and an inverse method is given for the strain field of a single ended fixed supported aluminum alloy structure based on the three-B-spline interpolation algo- rithm. On this basis, a distributed strain on-line monitoring system based on fiber Bragg grating sensor and resistance strain sensor is constructed. Research results show that the method is reliable and appli- cable.