摘要
为了实现管道悬跨检测,并适应现场管道内检测器的快速移动状态以及对应力传感器阵列低功耗的要求,本文提出了一种弱交流磁化条件下基于磁弹效应的管壁应力检测方法。首先通过有限元仿真研究了管道悬跨的受力特性并确定了应力传感器部署方案。其次建立了阻抗法钢材应力测量模型,设计并制作了应力传感器,最后开展了实验验证。结果表明管道顶部和底部的轴向应力可以灵敏地表征管道悬跨状态;弹性应力变化范围为0~50 MPa时,传感器线圈阻抗与应力呈负线性单调关系,且灵敏度系数的线性拟合优度大于0.92;灵敏度随着激励频率增加而增加,当激励频率在30 kHz时,平均灵敏度系数为-0.018Ω/MPa;单个传感器功耗不超过0.1 mW。
In order to detect pipeline spanning and adapt to the fast-moving state of in-pipeline detectors in the field and the low power consumption requirements of stress sensor arrays,this paper proposes a method of measuring the pipe wall stress based on magnetoelastic under weak alternating current.Firstly,stress characteristics of spanning pipeline are studied via finite element simulation,and the stress sensor deployment scheme is determined.Secondly,steel stress measurement model of electrical impedance method is established,and stress sensor is designed and fabricated.Finally,experimental verification is carried out.The results show that the axial stress at the top and bottom of the pipeline can sensitively characterize the spanning pipeline state;when the elastic stress varies from 0~50 MPa,the sensor coil impedance and the stress have a negative linear relationship,and the linear fitting goodness of the sensitivity coefficient is greater than 0.92;the sensitivity increases as the excitation frequency increases,and when the excitation frequency is 30 kHz,the average sensitivity coefficient is-0.018Ω/MPa;the power consumption of a single sensor is less than 0.1 mW.
作者
黄新敬
陈乾
马金玉
李健
封皓
Huang Xinjing;Chen Qian;Ma Jinyu;Li Jian;Feng Hao(State Key Laboratory of Precision Measuring Technology and Instruments,Tianjin University,Tianjin 300072,China)
出处
《电子测量与仪器学报》
CSCD
北大核心
2022年第12期106-116,共11页
Journal of Electronic Measurement and Instrumentation
基金
国家自然科学基金(62073233)项目资助
关键词
管道悬跨
应力测量
磁弹效应
管道力学分析
pipeline spanning
stress measurement
magnetoelastic effect
pipeline mechanical analysis
