基于光纤光栅传感的管道应力监测方法研究

Pipeline Stress Monitoring Method Based on Fiber Bragg Grating Sensors

为了解决传统应变计测量中存在的精度低、耐久性差、易受干扰等缺陷,提出了一种基于光纤光栅(FBG)传感的管道应力监测方法。在分析管道光纤光栅应力监测系统的基础上,详细阐述了确定传感器测点布置的截面位置及根据三点应力求解横截面最大轴向应力的方法,提出FBG传感器在管道表面的安装方案及温度补偿技术,对某终端6条管道共计96个测点进行了连续应力监测。监测结果表明,安装的光纤光栅可以方便地实时监测管道关键部位的应力变化及其可能产生的损伤,为在役管道的安全运行和健康诊断提供依据。

To solve the deficiencies of traditional strain gauges including low accuracy,poor reliability and liable to be distributed,a new method for monitoring pipeline stress based on fiber bragg grating（FBG） sensors is proposed.On the basis of the pipeline FBG stress monitoring system,sectional positions of sensor installation are determined and a method for evaluating maximum axial stress in the corresponding cross section based on three-point stresses on the pipeline is presented in detail,meanwhile,installation schemes and temperature compensation technique of FBG sensors are put forward respectively,and 96 measurement points on the surfaces of 6 pipelines in certain terminal are real-line monitored.The monitoring results show that stress variation and possible damages in critical positions can be monitored conveniently by mounted FBG sensors,and the resulting information can be provided for safety operation and health diagnosis on in-service pipelines.