裂缝扩展声发射有限元模拟及其信号时频分析
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摘要
根据定量地震学中的矩张量理论,建立了裂缝扩展声发射源的力学模型及有限元模型,通过有限元计算得到裂缝扩展声发射的波形信号。利用小波变换对不同裂缝深度的声发射波形信号进行时频分析,得到不同裂缝深度的声发射波形信号的时频特征。通过研究声发射信号中零阶反对称模式成分(A0)和零阶对称模式成分(S0)的能量比,发现声发射信号的能量比EA 0/ES 0随裂缝深度变化具有一定规律性,能够通过能量比判断裂缝扩展的深度。
The mechanical model and the finite element model of acoustic emission source are established according to the moment tensor theory in quantitative seismology,and the waveform signals of acoustic emission due to crack growth are calculated by finite element method.A time-frequency analysis based on the wavelet transform is employed to investigate the acoustic emission waveform signals in different depths,and the time-frequency characters of acoustic emission waveform signals in different depths are obtained.Specifically,a ratio of fundamental anti-symmetric mode energy to fundamental symmetric mode energy is studied for source depth identification.The energy ratios of acoustic emission signals have certain regularity with the crack depth variation.The crack depth can be estimated from the energy ratio.
The mechanical model and the finite element model of acoustic emission source are established according to the moment tensor theory in quantitative seismology,and the waveform signals of acoustic emission due to crack growth are calculated by finite element method.A time-frequency analysis based on the wavelet transform is employed to investigate the acoustic emission waveform signals in different depths,and the time-frequency characters of acoustic emission waveform signals in different depths are obtained.Specifically,a ratio of fundamental anti-symmetric mode energy to fundamental symmetric mode energy is studied for source depth identification.The energy ratios of acoustic emission signals have certain regularity with the crack depth variation.The crack depth can be estimated from the energy ratio.
引文
[1]袁振明,马羽宽.声发射技术及其应用[M].北京:机械工业出版杜,1984.
[2]赵国旗,骆英,朱建国,等.基于压电正交异性分布式AE技术的初步研究[J].振动、测试与诊断,2003,23(4):268-270.
[3]刘松平,Gorman M,陈积懋.模态声发射检测技术[J].无损检测,2000,22(1):38-41.
[4]罗斯J L.固体中的超声波[M].何存富,吴斌,王秀彦,译.北京:科学出版社,2004.
[5]他得安,黄瑞菊,刘镇清.数值分析法在超声检测中的应用[J].无损检测,2001,23(11):485-488.
[6]安艺敬一,理查兹P G.定量地震学理论和方法:第1卷[M].北京:地震出版社,1987.
[7]Moser F,Jacobs L J,Qu J.Modeling elastic wavepropagation in waveguides with the finite elementmethod[J].NDT and E International,1999,32:225-234.
[8]Lanza F,Di S,McNamara J.Measuring high-frequen-cy wave propagation in railroad tracks by joint time-frequency analysis[J].Journal of Sound and Vibra-tion,2004,273:637-651.
[2]赵国旗,骆英,朱建国,等.基于压电正交异性分布式AE技术的初步研究[J].振动、测试与诊断,2003,23(4):268-270.
[3]刘松平,Gorman M,陈积懋.模态声发射检测技术[J].无损检测,2000,22(1):38-41.
[4]罗斯J L.固体中的超声波[M].何存富,吴斌,王秀彦,译.北京:科学出版社,2004.
[5]他得安,黄瑞菊,刘镇清.数值分析法在超声检测中的应用[J].无损检测,2001,23(11):485-488.
[6]安艺敬一,理查兹P G.定量地震学理论和方法:第1卷[M].北京:地震出版社,1987.
[7]Moser F,Jacobs L J,Qu J.Modeling elastic wavepropagation in waveguides with the finite elementmethod[J].NDT and E International,1999,32:225-234.
[8]Lanza F,Di S,McNamara J.Measuring high-frequen-cy wave propagation in railroad tracks by joint time-frequency analysis[J].Journal of Sound and Vibra-tion,2004,273:637-651.
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