不同提离下海上石油平台铁磁性构件磁记忆检测方法研究
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摘要
海上石油平台铁磁性构件表面涂层造成探头提离导致磁信号减弱,会导致应力集中误判.我们对不同提离值下应力集中的磁记忆分析方法展开研究.首先,分别在提离0、0.5、1、2、3、4、5mm时采集试件的磁信号;其次,采用小波自适应阈值消噪提高磁信号的信噪比,对重复采集的磁信号进行相似度判别,消除其相异性;最后,分析不同提离值下磁信号的梯度和相轨迹.结果表明:提离值过大可能导致无法根据磁信号梯度识别应力集中,可用梯度值与梯度平均值的比值m或相轨迹辅助识别.基于此提出了不同提离值下的磁记忆分析方法,并在渤海某平台进行现场应用验证了其可行性.
Magnetic signal attenuation by the probe lift-off may lead to misjudgment on stress concentration.On offshore platforms,the probe lift-off is caused by the coating of the ferromagnetic components.To solve this problem,the magnetic memory analysis method for stress concentration under different lift-off values was studied.Firstly,the magnetic signals of the specimens of lift-off values of 0,0.5,1,2,3,4and 5mm were collected respectively.Secondly,the adaptive wavelet threshold denoising was used to improve the signal-tonoise ratio of the magnetic signals.The dissimilarity of the magnetic signals was eliminated through the signal similarity.Finally,the gradient and phase locus of the magnetic signals were analyzed.The result showed that if the stress concentration could not be identified by the gradient under a large lift-off value;and both the ratio mof gradient value to the average gradient value and the phase locus could be used to assist the identification.A magnetic memory analysis method under different lift-off values was proposed.The application on an offshore platform in the Bohai sea of China verified the feasibility of this method.
Magnetic signal attenuation by the probe lift-off may lead to misjudgment on stress concentration.On offshore platforms,the probe lift-off is caused by the coating of the ferromagnetic components.To solve this problem,the magnetic memory analysis method for stress concentration under different lift-off values was studied.Firstly,the magnetic signals of the specimens of lift-off values of 0,0.5,1,2,3,4and 5mm were collected respectively.Secondly,the adaptive wavelet threshold denoising was used to improve the signal-tonoise ratio of the magnetic signals.The dissimilarity of the magnetic signals was eliminated through the signal similarity.Finally,the gradient and phase locus of the magnetic signals were analyzed.The result showed that if the stress concentration could not be identified by the gradient under a large lift-off value;and both the ratio mof gradient value to the average gradient value and the phase locus could be used to assist the identification.A magnetic memory analysis method under different lift-off values was proposed.The application on an offshore platform in the Bohai sea of China verified the feasibility of this method.
引文
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[2]徐克薰,俞健,郑文尼.北海亚历山大·基兰德号平台覆没事故及其原因分析[J].机械工程材料,1985(1):3-8,14.XU K X,YU J,ZHENG W N.The capsize of Alexander L.Kielland platform in the North Sea and some of the published result of failure analysis[J].Mechanical Engineering Materials,1985(1):3-8,14.
[3]刘建磊.现役海洋平台结构安全评估技术研究[D].青岛:中国海洋大学,2013.LIU J L.Study on Structural Safety Assessment of Existing Offshore Platforms[D].Qingdao:Ocean University of China,2013.
[4]DOBOV A A.A study of metal properties using the method of magnetic memory[J].Metal Science and Heat Treatment,1997,39(9/10):401-405.
[5]WILSON J W,TIAN G Y,BARRANS S.Residual magnetic field sensing for stress measurement[J].Sensors and Actuators A:Physical,2007,135(2):381-387.
[6]ROSKOSZ M,BIENIEK M.Evaluation of residual stress in ferromagnetic steels based on residual magnetic field measurements[J].NDT&E International,2012,45(1):55-62.
[7]刘志才,王新华,陈迎春.提离值对X80钢磁力信号的影响[J].起重运输机械,2017(10):155-158.LIU Z C,WANG X H,CHEN Y C.Influence of lift-off value on magnetic signal of X80steel[J].Hoisting and Conveying Machinery,2017(10):155-158.
[8]张军,朱晟桢,毕贞法,等.基于金属磁记忆效应的高铁轮对早期故障检测[J].仪器仪表学报,2018,39(1):162-170.ZHANG J,ZHU S Z,BI Z F,et al.Early fault detection in high-speed wheel set based on the magnetic memory effects[J].Chinese Journal of Scientific Instrument,2018,39(1):162-170.
[9]HU B,LI L M,CHEN X,et al.Study on the influencing factors of magnetic memory method[J].International Journal of Applied Electromagnetics&Mechanics,2010,33(3):1351-1357.
[10]冷建成.基于磁记忆技术的铁磁性材料早期损伤诊断方法研究[D].哈尔滨:哈尔滨工业大学,2012.LENG J C.Research on Early Damage Diagnosis Method of Ferromagnetic Materials Based on Magnetic Memory Testing Technique[D].Harbin:Harbin Institute of Technology,2012.
[11]常炜,于湉.海上石油平台涂层腐蚀控制[J].涂料技术与文摘,2011,32(3):21-24.CHANG W,YU T.Coatings corrosion control for offshore platform[J].Coating Technology&Abstracts,2011,32(3):21-24.
[12]胡斌,沈功田.磁记忆检测技术在游乐设施上的应用[J].无损检测,2016,38(11):21-26.HU B,SHEN G T.Application of magnetic memory testing technology on amusement equipment[J].Nondestructive Testing,2016,38(11):21-26.
[13]邓永贡,王强,胡斌,等.焊接残余应力磁记忆信号特征的研究[J].中国计量学院学报,2016,27(1):52-57.DENG Y G,WANG Q,HU B,et al.Study on magnetic memory signal characteristics of welded residual stress[J].Journal of China University of Metrology,2016,27(1):52-57.
[14]李运涛,胡斌,赵潇男,等.打磨对金属磁记忆检测的影响[J].无损检测,2014,36(6):55-58,79.LI Y T,HU B,ZHAO X N,et al.Test on effect of descaling and polishing on metal magnetic memory testing[J].Nondestructive Testing,2014,36(6):55-58,79.
[15]任吉林,林俊明,任文坚,等.金属磁记忆检测技术研究现状与发展前景[J].无损检测,2012,34(4):3-11.REN J L,LIN J M,REN W J,et al.Mater magnetic memory testing technology development status and prospects[J].Nondestructive Testing,2012,34(4):3-11.