基于光纤光栅的应变场重构方法

Strain Field Reconstruction Method based on Fiber Grating

为满足直升机关键承力部件的应变监测需求,结合光纤光栅灵敏度高、体积小、抗电磁干扰、易于分布式组网的特点,提出构建基于光纤光栅的分布式应变场监测系统。通过对光纤光栅的应变传递及传感器布设方案进行理论分析,设计了基于三次样条函数插值的应变场反演算法。与Ansys有限元仿真数据进行验证对比,应变场反演平均误差为5.24%,表明该方法可以实时准确地获得部件受载荷下的应变场信息。

In order to meet the strain monitoring requirements of helicopter key load-bearing components,a distributed strain field monitoring system based on fiber gratings was proposed in combination with the characteristics of high sensitivity,small size,anti-electromagnetic interference and easy distribution networking.The strain field inversion algorithm based on cubic spline function interpolation was designed by theoretically analyzing the strain transfer and sensor arrangement of fiber gratings.Compared with Ansys finite element simulation data,the average error of strain field inversion was 5.24%,the results showed that this method could obtain real-time and accurate information of strain field under load.