电磁超声表面波换能器发射过程的精确建模与分析
Accurate Modeling and Analysis for Transmission Process of Surface Wave EMATs
摘 要
针对具有曲折线圈结构的电磁超声表面波换能器模型精度较低问题，以铝合金板材表层缺陷检测为背景，在考虑交变磁场影响前提下，通过将有限元方法与解析法相结合，建立了一个精确描述电磁超声表面波换能器发射过程的三维模型。仿真分析表明，换能器在发射过程中产生的交变磁场可激发出两倍频率成分的表面波;该表面波分量能够有效提高换能器的缺陷敏感度;增加发射电流、降低提离距离均可显著增强该分量。试验验证了所建模型的有效性和精确性。
电磁超声换能器
曲折线圈
交变磁场
Surface wave
Electromagnetic acoustic transducer
Meander-line coil
Dynamic magnetic field
Abstract
To increase the accuracy of the model of the meander-line-coil surface wave EMATs used for the inspection of surface layer of aluminum plates, this paper established a novel 3D accurate model by combining numerical calculations and analytical solutions with special attention to the influence of the dynamic magnetic field. Simulation and analysis indicated that the frequency of the surface waves due to the dynamic magnetic field was twice of that due to the static magnetic field; the double-frequency surface wave component could effectively improve the sensitivity of the transducers; both increasing transmitting current and decreasing lift-off distance could significantly enhance the component. The validity and accuracy of the established model was verified by experiment.
中图分类号 TG115.28
所属栏目 科研成果与学术交流
基金项目 国防科技工业技术基础科研资助项目(B1220102302);中央高校基本科研业务专项基金资助项目(HIT.NSRIF.2012008)
收稿日期 2011/6/7
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备注康磊(1981-)，男，讲师，博士，主要研究方向为电磁超声换能器优化设计与电磁超声无损检测技术。
引用该论文: KANG Lei,LI Zhi-Chao,ZHANG Xiao-Xia,ZHANG Yu-Ping. Accurate Modeling and Analysis for Transmission Process of Surface Wave EMATs[J]. Nondestructive Testing, 2012, 34(5): 1～6
康磊,李智超,张晓霞,张雨平. 电磁超声表面波换能器发射过程的精确建模与分析[J]. 无损检测, 2012, 34(5): 1～6
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参考文献
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【6】Salzburger H, Wang L, Gao R. In-motion ultrasonic testing of the tread of high-speed railway wheels using the inspection system AUROPA III［C］. Proceedings of 17th World Conference on NDT, China: Chsndt,2008:1234-1242.
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【12】Kawashima K. Electromagnetic acoustic wave source and measurement and calculation of vertical and horizontal displacements of surface waves［J］. IEEE Transactions on Sonics and Ultrasonics,1985,32(4):514-522.
【13】Jian X, Dixon S, Edwards S. Ultrasonic field modeling for arbitrary non-contact transducer source［J］. Proceeding of SPIE,2005,5852:515-519.
【14】Jian X, Dixon S, Grattan K, et al. A Model for pulsed Rayleigh wave and optimal EMAT design［J］. Sensors and Actuators,2006,128(2):296-304.
【15】Lamb H. On the propagation of tremors over the surface of an elastic solid［J］. Phil Trans R Soc,1994(203):1-42.
【2】张建合.高强铝合金材料的超声检测［J］.无损检测,2001,23(11):479-484.
【3】Hirao M, Ogi H. EMATs for Science and Industry: Noncontacting Ultrasonic Measurements［M］. Boston: Kluwer Academic Publishers,2003:199-341.
【4】Viktorov I. Rayleigh and Lamb Waves: Physical Theory and Application［M］. New York: Plenum Press,1967:1.
【5】Fan Y, Dixon S, Edwards R, et al. Ultrasonic surface wave propagation and interaction with surface defects on rail track head［J］. NDT&E Inter,2007,40(6):471-477.
【6】Salzburger H, Wang L, Gao R. In-motion ultrasonic testing of the tread of high-speed railway wheels using the inspection system AUROPA III［C］. Proceedings of 17th World Conference on NDT, China: Chsndt,2008:1234-1242.
【7】Shapoorabadi J, Sinclair N, Konrad A. Improved finite element method for EMAT analysis and design［J］. IEEE Transactions on Magnetics,2001,37(4):2821-2823.
【8】Shapoorabadi J, Sinclair A, Konrad A. The governing electrodynamic equations of electromagnetic acoustic transducers［J］. J Appl Phys,2005,97(10):10E102.
【9】Kaltenbacher M, Ettinger K, Lerch R. Finite element analysis of coupled electromagnetic acoustic systems［J］. IEEE Transactions on Magnetics,1999,35(2):1610-1613.
【10】Ludwig R. Numerical implementation and model predictions of a unified conservation law description of the electromagnetic acoustic transduction process［J］. IEEE Transactions on Ulrtasonics, Ferroelectrics, and Frequency Control,1992,39(4):481-488.
【11】康磊.用于铝板检测的电磁超声导波换能器优化设计技术研究［D］.哈尔滨：哈尔滨工业大学,2010:1-45.
【12】Kawashima K. Electromagnetic acoustic wave source and measurement and calculation of vertical and horizontal displacements of surface waves［J］. IEEE Transactions on Sonics and Ultrasonics,1985,32(4):514-522.
【13】Jian X, Dixon S, Edwards S. Ultrasonic field modeling for arbitrary non-contact transducer source［J］. Proceeding of SPIE,2005,5852:515-519.
【14】Jian X, Dixon S, Grattan K, et al. A Model for pulsed Rayleigh wave and optimal EMAT design［J］. Sensors and Actuators,2006,128(2):296-304.
【15】Lamb H. On the propagation of tremors over the surface of an elastic solid［J］. Phil Trans R Soc,1994(203):1-42.
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