Structural Health Monitoring

This research focuses on the analysis of guided Lamb waves for structural health monitoring by time-frequency representations, with an emphasis on quantitative techniques to locate and size cracks and other defects in plate-like components. Lamb waves are generated and detected by lasers. The dispersive nature of Lamb waves is a major source of complication for the analysis. We have explored a variety of different time-frequency methods to improve the quantitative analysis of Lamb wave signals. Representative publications include [1] [2] [3] [4] [5] [6] [7] [8].


References

  1. Kerber F, Sprenger H, Niethammer M, Luangvilai K, Jacobs L
    2010.  Attenuation analysis of Lamb waves using the chirplet transform. EURASIP: Journal on Advances in Signal Processing.
  2. Kuttig H, Niethammer M, Hurlebaus S, Jacobs LJ
    2006.  Model-based analysis of dispersion curves using chirplets.. The Journal of the Acoustical Society of America. 119(4):2122-30.
  3. Kotte O, Niethammer M, Jacobs LJ
    2006.  Lamb Wave Characterization by Differential Reassignment and Nonlinear Anisotropic Diffusion. NDT & E International. 39:96–105.
  4. Benz R, Niethammer M, Hurlebaus S, Jacobs LJ
    2003.  Localization of notches with Lamb waves.. The Journal of the Acoustical Society of America. 114(2):677-85.
  5. Hurlebaus S, Niethammer M, Jacobs LJ, Valle C
    2001.  Automated methodology to locate notches with Lamb waves. Acoustic Research Letters Online. 2:97–102.
  6. Valle C, Niethammer M, Qu J, Jacobs LJ
    2001.  Crack characterization using guided circumferential waves. Journal of the Acoustical Society of America. 110:1282–1290.
  7. Niethammer M, Jacobs LJ, Qu J, Jarzynski J
    2001.  Time-frequency representations of Lamb waves. Journal of the Acoustical Society of America. 109:1841–1847.
  8. Niethammer M, Jacobs LJ, Qu J, Jarzynski J
    2000.  Time-frequency representation of Lamb waves using the reassigned spectrogram. Acoustic Research Letters Online. 107:L19–L24.