长标距传感技术在结构力学实验教学中的应用

Application of Long-gauge FBG Sensing Technology in Structural Mechanics Experiment Teaching

设计了间接位移测量综合实验。通过引入长标距光纤光栅(FBG)传感原理和间接位移测量原理,展示了基于长标距FBG传感的结构位移测量实验流程,并以简支梁动静态实验为例,指导学生设计并完成实验。基于长标距FBG传感技术的位移测量综合实验,测量了结构的应变和位移响应,揭示了结构应变和位移间的转换关系,解决了测量内容单一、技术不可靠以及成本高等难题,培养了学生理论联系实际和分析问题解决问题的能力,深化了学生对结构力学中力学原理的理解。

In order to improve the simple content and backward method of traditional structural mechanics experiment teaching,the advanced long-gauge fiber brag grating(FBG)sensing technology is integrated into the comprehensive experimental teaching of structural mechanics to strengthen the cultivation of students’engineering application and innovation ability.In this paper,a comprehensive experiment of indirect displacement measurement is designed.By introducing the long-gauge FBG sensing principle and the indirect displacement measurement principle,the experimental flow of structural displacement measurement is demonstrated based on long-gauge FBG sensing.The dynamic and static experiments of a simple supported beam is taken as examples to guide students to design and complete the experiment.This indirect displacement measurement experiment based on long-gauge FBG sensing technology measures the strain and displacement response of the structure,and reveals the transformation relationship between strain and displacement of the structure.It improves the problems of single measurement content,unreliable technology and high cost,cultivates students’ability to combine theory with practice and analyze problems,deepens students’understanding of mechanics principles in structural mechanics,and realizes diversified experimental teaching.