非饱和磁化下钢管缺陷涡流检测的定量评价方法研究

项目名称： 非饱和磁化下钢管缺陷涡流检测的定量评价方法研究

项目编号： No.51265041

项目类型： 地区科学基金项目

立项/批准年度： 2013

项目学科： 机械、仪表工业

项目作者： 宋凯

作者单位： 南昌航空大学

项目金额： 50万元

中文摘要： 钢管涡流检测相关标准如ASTM E309-2011认为，钢管饱和磁化后相当于非铁磁性管道，探伤结果与管道磁特性无关，这种观点忽视了此时缺陷磁特性和漏磁场参量的影响，使得缺陷量化评价失真。本项目旨在研究钢管涡流检测的磁特性影响机理及缺陷量化评价方法。通过掌握磁饱和下钢管缺陷磁导率非均匀特性和漏磁场分布，研究这两个参量与响应信号之间的作用规律，揭示钢管饱和磁化时磁特性影响的涡流检测机理；提出磁导率等效处理的改进算法，实现不同磁化方法和励磁强度下钢管涡流检测模型的时谐稳态计算，结合实验手段研究非饱和磁化下典型缺陷不同层次位置和参数的辨识方法；研究非饱和磁化下钢管高速探伤时信号扰动机理及模型优化，建立高效的缺陷反演模型，提出钢管缺陷的涡流检测定量评价理论和方法。 本项目对钢管的无损评价具有重要的理论研究意义和工程应用价值，研究成果可应用于机械、特种设备和石油化工等领域铁磁构件的安全维护。

中文关键词： 直流磁化；涡流检测；磁特性；非饱和磁化；量化评价

英文摘要： The standard about the eddy current testing of steel pipes such as ASTM E309-2011 regards that after magnetic saturation, steel pipes can be considered as non ferromagnetic pipes, the inspection results have no relation with pipe magnetic properties. However, this point ignores the effect of pipe defect magnetic properties and leakage magnetic field, which leads to the detection mechanism imperfect, making the distortion of quantitative evaluation about defecting. This project is to research eddy current testing of steel pipe magnetic properties affecting theory and quantitative evaluation about defecting. By knowing unsaturation properties of steel pipe defecting magnetic properties and leakage magnetic field under magnetic saturation, it also researches the magnetic properties in defecting areas and the effect between magnetic field and response signal, revealing the theory of eddy current testing of effect about steel pipe magnetic properties. And we propose the improved algorithm of equivalent magnetic permeability, which achieves the harmonic model about eddy current testing of steel pipe under the different magnetic method and exciting magnetic intensity. Thus, we research the particular defecting in different positions and the identification method of parameters. We study the signal disturbance theory of

英文关键词： DC Magnetization；Eddy current testing；Magnetic characteristic；Unsaturated magnetization；Quantitative evaluation