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不锈钢管道均匀电磁场内检测探头设计和试验研究
李伟1,赵建明1,葛玖浩2,袁新安1,刘健1,殷晓康1,陈国明1
(1.中国石油大学(华东)海洋油气装备与安全技术研究中心,山东青岛 266580;2.南京航空航天大学高速载运设施的无损检测监控技术工信部重点实验室,江苏南京 210016)
摘要:
针对传统的均匀电磁场检测探头不适用于管道内检测的不足,设计一种赫姆霍兹线圈式不锈钢管道内检测探头并搭建试验系统。通过有限元软件COMSOL建立轴向裂纹的不锈钢管道均匀电磁场内检测有限元模型,探究不锈钢管道内电磁场的分布和变化规律,提取特征信号Bz和Br,分析裂纹的长度和深度对特征信号的影响。根据仿真结果和管道内检测的特点,设计赫姆霍兹线圈式管道内检测探头,搭建不锈钢管道内检测试验系统,并进行试验测试。结果表明:管道内表面的裂纹会引起均匀电磁场的扰动;特征信号Bz的畸变量包含裂纹的深度信息,Br的波峰波谷间距包含裂纹的长度信息;检测系统可以实现不锈钢管道内表面轴向裂纹的全周向扫查。
关键词:  不锈钢管道内检测  均匀电磁场  赫姆霍兹线圈  轴向裂纹
DOI:10.3969/j.issn.1673-5005.2019.06.014
分类号::TE 973
文献标识码:A
基金项目:国家重点研发计划项目(2017YFC0804503);国家自然科学基金项目(51574276);山东省重点研发计划项目(2018GHY115026);博士后创新人才支持计划项目(BX20190386);中国石油大学(华东)研究生创新工程项目(YCX2019063)
Design and experimental analysis of uniform electromagnetic probe for inner inspection of stainless steel pipe
LI Wei1, ZHAO Jianming1, GE Jiuhao2, YUAN Xin 'an1, LIU Jian1, YIN Xiaokang1, CHEN Guoming1
(1.Center for Offshore Equipment and Safety Technology in China University of Petroleum (East China), Qingdao 266580, China;2.Nondestructive Detection and Monitoring Technology for High Speed Transportation Facilities Key Laboratory of Ministry of Industry and Information Technology, Nanjing University of Aeronautic and Astronautic, Nanjing 210016, China)
Abstract:
Aiming at the deficiencies of traditional uniform electromagnetic detection probes which are not suitable for the stainless pipe inner detection, a Helmholtz coil-type inner detection probe for stainless steel pipes and its experimental system are proposed and built. Through the finite element software COMSOL, the finite element model of the uniform electromagnetic field in the axial crack on the stainless steel pipe inner detection was established. The distribution and variation law of the electromagnetic field in the pipe were explored, the characteristic signals Bz and Br were selected, and the influence of the length and depth of the crack on the characteristic signal was analyzed. Based on the simulation results and the characteristics of the inner detection in the pipe, the Hemholtz coil-type pipe detection probe was designed, and then a stainless steel pipe inner detection experimental system was built and tested. The results show that the crack on the inner surface of the pipeline will cause the disturbance of the uniform electromagnetic field. The characteristic signal Bz contains the depth information of the distorted crack, and the peak-to-valley spacing of Br contains the information of the crack length. Finally, the detection system can realize the full circumferential scan of the axial crack on the inner surface of the stainless steel pipe.
Key words:  inner inspection of stainless steel pipe  uniform electromagnetic field  Helmholtz coil  axial crack
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