基于电磁超声的钢板结构损伤成像技术
Technology of Damage Imaging of the Steel Plate-like Structure Based on EMAT
摘 要
采用基于tEP的正交匹配信号处理方法,结合时间反转理论,进行钢板结构损伤的成像研究.首先利用电磁超声换能器(EMAT)在钢板上激励并接收兰姆波,运用匹配追踪算法对接收的原始信号进行处理,以改善信号质量;然后对钢板损伤前后的信号做代数差,并结合时间反转理论,获得时间反转信号.最后,将时间反转信号按照合成成像原理进行损伤成像.试验表明:该方法可以精确提取信号的包络,较为准确地监测出缺陷的位置、范围等特征.
正交匹配追踪
时间反转
兰姆波
EMAT
Orthogonal matching pursuit
Time reverse
Lamb wave
Abstract
The paper researches the damage imaging of the steel plate-like structure by using orthogonal matching pursuit based on tEP and the theory of time reverse.At first the electromagnetic acoustic transducer (EMAT) is used to excite and receive Lamb wave on the plate,the signal is processed with matching pursuit algorithm to improve signal quality;Then the algebraic difference is performed for the signals and a set of time reversal signal are obtained by combining with time reverse theory;Finally,damage imaging is realized in accordance with the principle of synthetic imaging.Experiments show that this method can extract the envelope signal precisely and accurately monitor the defect features.
中图分类号 TG115.28
所属栏目 试验研究
基金项目 海军工程大学基金资助项目(HGDYDJJ13152)
收稿日期 2014/8/15
修改稿日期
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备注刘燕(1972-),女,副教授,主要研究方向为弹性波动理论,无损检测.
引用该论文: LIU Yan,SHEN Chuan-jun,WANG Yue-min. Technology of Damage Imaging of the Steel Plate-like Structure Based on EMAT[J]. Nondestructive Testing, 2015, 37(3): 33～38
刘燕,申传俊,王悦民. 基于电磁超声的钢板结构损伤成像技术[J]. 无损检测, 2015, 37(3): 33～38
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参考文献
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【2】刘燕,王悦民,孙丰瑞,等.板状结构缺陷电磁超声导波检测技术研究进展[J].无损检测,2012,34(10):60-66.
【3】MALLAT S,ZHANG Z.Matching pursuits with time-frequency dictionaries[J].IEEE Transactions on Signal Processing,1993,41(12):3397-3415.
【4】张海燕,孙修立,曹亚萍,等.基于时间反转理论的聚焦Lamb波结构损伤成像[J].物理学报,2010,59(10):7111-7118.
【5】王晶,周波.铝板结构主动Lamb波扫查合成损伤成像方法[J].无损检测,2010,32(4):246-248.
【6】邓菲,吴斌,何存富.基于时反导波检测的管道缺陷圆周定位研究[J].声学学报,2008,33 (1):28-34.
【7】张海燕,马世国,冯国瑞,等.兰姆波结构健康监测中的概率损伤成像[J].声学学报,2012,37(4):401-407.
【8】郭金库,刘光斌,余志勇,等.信号稀疏表示理论及其应用[M].北京:科学出版社,2013.7.
【9】PATI Y C,REZAIFAR R,SLSHNA P P.Orthogonal matching pursuit excursive function approximation with application to wavelet decomposition[C].In 27th Asilomar Conf on signals,Systems and Computrs,1993.
【10】申传俊.基于稀疏分解的超声导波检测信号处理方法研究[D].武汉:海军工程大学,2012,10.
【11】LIU Yan,WANG Yue-min,SHEN Chuan-jun,et al.Study on recognize for Lamb wave test signals based on finite element modeling[C].[s.l.] Applied Mechanic and Materials,2013,2:25-29.
【12】DONGSEOK Y,JONG B K,KYUNG Y J.Imaging of contact acoustic nonlinearity using synthetic aperture technique[J].Ultrasonics,2013,53:1349-1354.
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