摘要
提出了一种采用有限元法对钻杆外螺纹检测中磁化器的各项几何参数进行设计的方法.以齿根有1.0mm深0.2 mm宽的根部裂纹、其管体直径为Φ127的钻杆为例,分析了磁化器各项几何参数的变化对缺陷所产生的漏磁场的影响,得到了漏磁场水平分量随磁化器几何尺寸改变时的变化规律,通过实验对根据上述方法设计的磁化器进行了验证,实验结果与有限元分析结果完全相符.研究结果有助于从整体上设计磁化器,改善磁化效果,提高漏磁检测灵敏度,进而为漏磁检测中磁路的优化设计提供了依据.
A FEM to analyse and design the geometrical dimension of magnetic exciter of pin threads inspection was introduced in this paper. Taking the drill pipe with Ф127 （body diameter） and 1.0 mm （depth））×0.2 mm（width） crack in the tooth root, the influence of the geometric size of the magnetizer on pin thread magnetization of drill pipe in magnetic circuit design was analyzed. Correlation curves were given for the magnetic flux leakage along change in magnetizer size. The result can be used in magnetic circuit design for improving magnetic effect and testing sensitivity and for providing a method for optimizing the magnetization design in magnetic flux leakage testing. This analysis method is validated by experiments and the experimental result just meet the analysis result.
出处
《华中科技大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2007年第1期93-95,共3页
Journal of Huazhong University of Science and Technology(Natural Science Edition)
关键词
钻杆
螺纹
磁化
有限元法
漏磁检测
drill pipe
thread
magnetization
finite element method （FEM）
magnetic flux leakage testing
