薄板腐蚀缺陷兰姆波成像检测的有限元模拟
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摘要
基于A0模式兰姆波对薄板腐蚀缺陷进行成像检测,在频率一定时,由于腐蚀造成板厚的改变将进一步影响检测兰姆波速度的变化,通过检测兰姆波波速的变化可以对板材腐蚀类缺陷进行监测.根据A0模式兰姆波的频率特征,测量发射探头与接收探头之间的兰姆波走时,结合波的实际传播路径,计算出实际检测兰姆波的速度,采用联合迭代重建技术(SIRT)对走时数据进行群速度图像重建.基于有限元数值方法,采用A0模式兰姆波对薄铝板中的腐蚀类缺陷进行模拟检测,给出了成像检测结果.
This paper is on image detection conducted by A0 mode Lamb wave in thin plate corrosion defect.At a given frequency,owning to the influence of the plate thickness caused by corrosion on the velocity of the Lamb wave,thin plate corrosion defect can be monitored through the velocity of the Lamb wave.Due to the dispersive property of the A0 mode Lamb wave,with measurement of travel times of ultrasonic Lamb wave between the transmitting and the receiving transducers,consideration of actual ray paths and calculation of the velocity of the Lamb wave,SIRT is applied to the group velocity imaging reconstruction for the given set of arrival times.Based on Finite Element method,simulation testing is in progress under the effects of A0 mode Lamb wave on the erosion/corrosion in thin aluminum plate and imaging detection results are given in details.
This paper is on image detection conducted by A0 mode Lamb wave in thin plate corrosion defect.At a given frequency,owning to the influence of the plate thickness caused by corrosion on the velocity of the Lamb wave,thin plate corrosion defect can be monitored through the velocity of the Lamb wave.Due to the dispersive property of the A0 mode Lamb wave,with measurement of travel times of ultrasonic Lamb wave between the transmitting and the receiving transducers,consideration of actual ray paths and calculation of the velocity of the Lamb wave,SIRT is applied to the group velocity imaging reconstruction for the given set of arrival times.Based on Finite Element method,simulation testing is in progress under the effects of A0 mode Lamb wave on the erosion/corrosion in thin aluminum plate and imaging detection results are given in details.
引文
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[5]Pei J,Yousuf M I,Degertekin F L.Lamb wave tomography and its application in pipe erosion/corrosion monitoring[J].Res.Nondestr Eval,1996(8):189-197.
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[7]Fromme P,Sayir M B.Measurement of the scattering of a Lamb wave by a through hole in a plate[J].Journal of theAcoustical Society of America,2002,11(3):1165-1170.
[8]Hinders,Leonard M K,Kevin R.Lamb wave tomography of pipes and tanks using frequency compounding[C].AIP Conference Proceedings,2005,760:867-874.
[9]张海燕,他得安,刘镇清.层状各向异性复合板中的兰姆波[M].北京:科学出版社,2008:138-156.
[10]马德堂.弹性波场数值模拟及井间地震初至波旅行时层析成像[D].西安:长安大学,2005.
[11]魏运飞,卢超,张在东.薄板声-超声检测时兰姆波传播模式的有限元模拟[J].无损检测,2009,31(7):520-524.Wei YunFei,Lu Chao,Zhang ZaiDong.Finite element modeling of acousto-ultrasonic lamb wave propagation modein thin plate[J].Nondestructive Testing,2009,31(7):520-524.(in Chinese)
[2]张海燕,周全,吕东辉,等.各向同性薄板中横穿孔缺陷的超声兰姆波层析成像[J].声学学报,2007,32(1):83-90.Zhang Haiyan,Zhou Quan,LüDonghui,et al.Ultrasonic lamb wave tomography of through hole flaws in isotropicthin plates[J].Acta Acoustica,2007,32(1):83-90.(in Chinese)
[3]庄天戈.CT原理与算法[M].上海:上海交通大学出版社,1992:77-98.
[4]陈建忠,史耀武.超声检测过程的数值模拟[J].无损检测,2001,23(5):198-201.Chen Jianzhong,Shi Yaowu.The numerical simulation of ultrasonic testing[J].Nondestructive Testing,2001,23(5):198-201.(in Chinese)
[5]Pei J,Yousuf M I,Degertekin F L.Lamb wave tomography and its application in pipe erosion/corrosion monitoring[J].Res.Nondestr Eval,1996(8):189-197.
[6]Hinders,Malyarenko M K,Eugene V.Comparison of double crosshole and fanbeam lamb wave ultrasonictomography[C].AIP Conference Proceedings,2001,557:732-739.
[7]Fromme P,Sayir M B.Measurement of the scattering of a Lamb wave by a through hole in a plate[J].Journal of theAcoustical Society of America,2002,11(3):1165-1170.
[8]Hinders,Leonard M K,Kevin R.Lamb wave tomography of pipes and tanks using frequency compounding[C].AIP Conference Proceedings,2005,760:867-874.
[9]张海燕,他得安,刘镇清.层状各向异性复合板中的兰姆波[M].北京:科学出版社,2008:138-156.
[10]马德堂.弹性波场数值模拟及井间地震初至波旅行时层析成像[D].西安:长安大学,2005.
[11]魏运飞,卢超,张在东.薄板声-超声检测时兰姆波传播模式的有限元模拟[J].无损检测,2009,31(7):520-524.Wei YunFei,Lu Chao,Zhang ZaiDong.Finite element modeling of acousto-ultrasonic lamb wave propagation modein thin plate[J].Nondestructive Testing,2009,31(7):520-524.(in Chinese)
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