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介绍了光纤光栅分布式传感原理,推导了悬臂梁受载荷时的应变计算公式,以金属悬臂梁为研究对象,以光纤光栅应变传感阵列为传感工具,实验研究了固定载荷下裂缝悬臂梁的光纤光栅检测的新方法。金属悬臂梁上光纤光栅应变传感阵列粘贴的位置和预制裂纹的位置由有限元模拟确定,固定载荷的加载是在金属悬臂梁的自由端悬挂标准砝码。记录金属悬臂梁在无损伤、一条裂缝、两条裂缝和三条裂缝的光纤光栅应变传感阵列检测到的实验数据,以无损伤的实验数据为初始数据,分别与有损伤的实验数据进行比较,得到悬臂梁在各个损伤情况下的应变变化量,根据应变变化量的不同,确定出悬臂梁上损伤的位置。
The distributed sensing principle of fiber grating is introduced and the strain calculation formula of the cantilever subjected to load is derived. Taking the metal cantilever as the research object and the fiber grating strain sensor array as the sensing tool, the crack cantilever A New Method for Detecting Beams by Fiber Bragg Gratings. The location of the fiber grating strain sensing array on the metal cantilever and the location of the prefabricated crack were determined by finite element simulation. The loading of the fixed load was carried at the free end of the metal cantilever beam. The experimental data of metal cantilever beams detected by fiber grating strain sensing array with no damage, one crack, two cracks and three cracks were recorded. The experimental data without damage were taken as the initial data and compared with the experimental data with damage respectively. The amount of strain in the cantilever beam under each damage condition is obtained. According to the different amount of strain, the position of damage on the cantilever beam is determined.