缺陷方向对磁致伸缩导波检测敏感性影响分析
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摘要
采用有限元仿真与实验相结合的方法建立磁致伸缩导波管道检测平台,在待测管道上预置与周向分别呈0°～90°的10个大小相同的槽型缺陷,依次利用L(0,2)纵向模态导波和T(0,1)扭转模态导波进行检测.仿真和实验结果均表明:L(0,2)导波缺陷回波幅值随着缺陷角度增加而逐渐降低,50°时已经难以分辨出缺陷信号,L(0,2)导波适合检测50°以下缺陷;T(0,1)导波的缺陷幅值随着缺陷角度的增加先减小后增大,并且整体具有较高的信噪比,T(0,1)模态导波对各个方向的缺陷检测均有良好的适用性.
A magnetostrictive guided wave pipeline inspection platform was established by means of finite element simulation and experiment. 10 grooved defects with the same size were preseted on the pipeline. The angle between them and the circumference was from 0 to 90 degrees. L(0,2) longitudinal mode guided waves and T(0,1) torsional mode guided waves were used to conduct pipeline detection in turn. Both simulation and experimental results show that the amplitude of L(0,2) guided wave defect echo decreases gradually with the increase of defect angle, and it is difficult to distinguish the defect signal when it is 50 degrees, which are more suitable for defect detection below 50 degrees; the defect amplitude of T(0,1) guided wave decreases first and then increases with the increase of defect angle, and the signal-to-noise ratio is high, which have good applicability for defect detection in all directions.
A magnetostrictive guided wave pipeline inspection platform was established by means of finite element simulation and experiment. 10 grooved defects with the same size were preseted on the pipeline. The angle between them and the circumference was from 0 to 90 degrees. L(0,2) longitudinal mode guided waves and T(0,1) torsional mode guided waves were used to conduct pipeline detection in turn. Both simulation and experimental results show that the amplitude of L(0,2) guided wave defect echo decreases gradually with the increase of defect angle, and it is difficult to distinguish the defect signal when it is 50 degrees, which are more suitable for defect detection below 50 degrees; the defect amplitude of T(0,1) guided wave decreases first and then increases with the increase of defect angle, and the signal-to-noise ratio is high, which have good applicability for defect detection in all directions.
引文
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[21] 孙永,徐江,周金海,等.磁致伸缩导波传感器换能效率估计方法[J].仪器仪表学报,2017,38(7):1705-1713.DOI:10.19650/j.cnki.cjsi.2017.07.018.
[2] TANG Mingxi,WU Xinjun,CONG Ming,et al.A method based on SVD for detecting the defect using the magnetostrictive guided wave technique[J].Mechanical Systems and Signal Processing,2016,70/71:601-612.DOI:10.1016/j.ymssp.2015.09.018.
[3] 龙盛蓉.管道磁致伸缩导波检测机理及传播特性研究[D].南昌:南昌大学,2014.
[4] 李志农,孟宁,龙盛蓉.激励频率对扭转模态磁致伸缩导波检测性能影响[J].华侨大学学报(自然科学版),2017,38(5):632-637.DOI:10.11830/ISSN.1000-5013.201610030.
[5] 王秀彦,王智,焦敬品,等.超声导波在管中传播的理论分析与试验研究[J].机械工程学报,2004,40(1):11-16.DOI:10.3321/j.issn:0577-6686.2004.01.003.
[6] LIU Zenghua,XIE Xiaodong,WU Bingao,et al.The application of low frequency longitudinal guided wave mode for the inspection of multi-hole steel floral pipes[J].Journal of Physics (Conference Series),2012,353(1):12-13.DOI:10.1088/1742-6596/353/1/012013.
[7] LOWE M,ALLEYNE D,CAW L P.Defect detection in pipes using guided waves[J].Ultrasonics,1998,36:147-154.DOI:10.1016/S0041-624X(97)00038-3.
[8] 刘胜骆,苏军.基于超声导波技术的长输管道无损检测[J].无损检测,2015,37(6):40-42.DOI:10.11973/wsjc201506010.
[9] NAKAMURA N,OGI H,HIRAO M.Mode conversion and total reflection of torsional waves for pipe inspection[J].Japanese Journal of Applied Physics,2013,52(7):7-14.DOI:10.7567/JJAP.52.07HC14.
[10] KIM H W,KWON Y E,CHO S H,et al.Shear-horizontal wave-based pipe damage inspection by arrays of segmented magnetostrictive patches[J].IEEE Trans Ultrason Ferroelectr Freq Control,2011,58(12):2689-2698.DOI:10.1109/TUFFC.2011.2131.
[11] GREIL M,POOHSAI A,CHANDARANA N.Guided wave propagation and damage detection in composite pipes using piezoelectric sensors[J].Procedia Engineering,2017,188:148-155.DOI:10.1016/j.proeng.2017.04.468.
[12] HERDOVICS B,CEGLA F.Structural health monitoring using torsional guided wave electromagnetic acoustic transducers[J].Structural Health Monitoring,2018,17(1):24-38.DOI:10.1177/1475921716682688.
[13] JOULE J R.On the effects of magnetism upon the dimensions of iron and steel bars[J].Philosophical Magazine,1847,30(199):76-87,225-241.DOI:10.1080/14786444708645656.
[14] 孟宁.架空压力弯管的超声导波检测技术研究[D].南昌:南昌航空大学,2017.DOI:CNKI:CDMD:2.1017.711463.
[15] VILLARI E.Ueber die aenderungen des magnetischen moments,welche der zug und das hindurchleiten eines galvanischen stroms in einem stabe von stahl oder eisen hervorbringen[J].Annalen Der Physik,2010,202(9):87-122.DOI:10.1002/andp.18652020906.
[16] LONG Shengrong,ZHONG Yuning,LIU Ying,et al.Effect of homogeneous bias magnetic field on output characteristics of magnetostrictive waveguide sensor[J].Acta Petrolei Sinica,2014(2):390-394.DOI:10.7623/syxb2014 02023.
[17] LIU Zenghua,ZHANG Yinong,WU Bingao.Research on finite element simulation in bias magnetic field of the magnetostrictive sensor used for steel strands[J].Journal of Basic Science and Engineering,2009,17(2):281-289.DOI:10.1360/972008-2465.
[18] 焦敬品,刘伟,马庆增,等.偏置磁场对磁致伸缩纵向导波换能器效能的影响研究[J].实验力学,2013,28(5):563-571.DOI:10.7520/1001-4888-12-168.
[19] VINOGRADOV S,COBB A,BARTLETT J,et al.Development of a novel omnidirectional magnetostrictive transducer for plate applications[J].American Institute of Physics Conference Series,2018,1949(1):090002.DOI:10.1063/1.5031565.
[20] 魏争,黄松岭,赵伟,等.磁致伸缩管道缺陷超声导波检测系统研制[J].电测与仪表,2013,50(9):21-25,104.DOI:10.3969/j.issn.1001-1390.2013.09.005.
[21] 孙永,徐江,周金海,等.磁致伸缩导波传感器换能效率估计方法[J].仪器仪表学报,2017,38(7):1705-1713.DOI:10.19650/j.cnki.cjsi.2017.07.018.