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