共查询到18条相似文献,搜索用时 203 毫秒
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根据油管螺纹分离式漏磁检测原理,对螺纹检测探头的设计进行了研究.设计了基于集成霍尔元件差分阵列组合的油管螺纹漏磁检测探头.试验表明,该检测探头能够有效地消除油管螺纹检测过程中的背景磁场信号和螺纹信号,提高了检测信号的信噪比. 相似文献
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由于复杂的工况,抽油管的内、外壁极易发生损伤。目前,抽油管的检测方式主要是将抽油管抽离油井后送至后线检测场地进行检测,造成了时间、人力、物力的浪费。采用漏磁检测方法,开展了抽油管在起管或下管过程中的在线检测;设计了瓦片式磁化结构,建立抽油管漏磁检测的三维仿真模型;针对抽油管的腐蚀缺陷,改变缺陷尺寸参数,研究了缺陷漏磁场的分布特性;研发了抽油管在线漏磁检测系统,在实验室和油田作业现场对抽油管进行在线检测试验。试验结果表明,该系统能够快速高效地完成抽油管的在线检测,为抽油管的损伤监测提供了一些参考。 相似文献
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介绍了基于漏磁探伤原理的钢管管缝在线检测装置,对装置的励磁磁路结构、磁敏感检测元件及其信号处理作了较详细的分析论述。 相似文献
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漏磁(MFL)检测信号常被多种噪声源污染,极大地降低了漏磁信号中缺陷信号的可检测性。提出一种漏磁信号去噪新方法。该法首先利用自适应滤波方法去除漏磁信号中的无缝管道噪声(SPN),然后再利用小波系数去噪方法去除SPN自适应消除系统输出的漏磁信号中的噪声。实测的漏磁信号处理结果说明,该方法具有良好的去噪效果,可提高漏磁信号中缺陷信号的可检测性。 相似文献
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提出一种油气管道裂纹漏磁场检测的数学分析方法。先根据麦克斯韦方程组推导出漏磁场数据分析模型。其次,利用三维有限元分析原理在Ansys环境下建立数学仿真模型。再将仿真结果与实际测试数据进行比较,确定该方法的可靠性。最后,通过仿真分析得出了裂纹几何参数(深度和宽度等)对漏磁信号特征的影响规律,并给出它们的关系曲线。该方法为实际利用漏磁场分布检测油气管道裂纹提供了重要的依据。 相似文献
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The effects of uniaxial stress on the normal (radial) component of the magnetic flux leakage (MFL) signal induced by blind-hole defects for depths of 25%, 50% and 75% of the thickness of the pipe wall were investigated with a pipe wall flux density of 1.24 T. These three defects were on the same surface as the magnetizer and sensor for the MFL signal (near side). A fourth 50% defect was on the pipe wall surface opposite the sensor (far side). Changes of as much as 47% in the MFL signal due to stresses of up to 300 MPa were observed. Increased changes in the stress dependent MFL signal were observed with increasing defect depth. Comparison of the near side and far side 50% defects indicated similar changes in the MFLpp signal as a function of stress, although the shape of the MFL signals was qualitatively different. The stress dependent MFL signal was also investigated for the near side 50% defect for pipe wall flux densities between 0.65 T and 1.24 T. A linear increase in the effects of stress on the MFL signal with increasing flux density was observed. Results demonstrated that the variation of the MFL signal with stress is primarily a bulk stress effect, although the effect of defect-induced stress concentrations upon the various MFL signals investigated could also be observed. 相似文献