论文信息 - Waveform design for high-resolution damage detection using lamb waves [Correspondence]

Waveform design for high-resolution damage detection using lamb waves [Correspondence]

Dispersion is encountered very often in ultrasonic guided waves, and may decrease the performance for damage detection significantly. For this reason, many signal processing methods have been proposed to obtain each mode under serious dispersion. In this paper, a new scheme is established for waveform design to suppress the dispersion such that each wave packet can be separated clearly. In this method, the dispersion effect of the guided wave is pre-compensated for a particular distance as it propagates through the structure. The relationship between the resolvable resolution and the waveform parameters is discussed; this relationship is employed as a guide to separately identify the wave packets caused by different structural features. Subsequently, an experiment is carried out to compare the performance of the proposed method with the time-reversal method. By using the proposed method, closely distributed structural features can be recognized with ease in the time domain.

[1] Lin Ye,et al. Application of Algorithms for Identifying Structural Damage – Case Studies , 2009 .

[2] P. Cawley,et al. A signal regeneration technique for long-range propagation of dispersive Lamb waves , 1993 .

[3] M. Fink,et al. Self-focusing and time recompression of Lamb waves using a time reversal mirror , 1998 .

[4] Sang Jun Lee,et al. Chirp excitation of ultrasonic guided waves. , 2013, Ultrasonics.

[5] Peter W. Tse,et al. Evaluation of pipeline defect's characteristic axial length via model-based parameter estimation in ultrasonic guided wave-based inspection , 2011 .

[6] P. Wilcox,et al. The effect of dispersion on long range inspection using ultrasonic guided waves , 2001 .

[7] P. Cawley,et al. The interaction of Lamb waves with defects , 1992, IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control.

[8] S. Gopalakrishnan,et al. Time reversal technique for health monitoring of metallic structure using Lamb waves. , 2009, Ultrasonics.

[9] P.D. Wilcox,et al. A rapid signal processing technique to remove the effect of dispersion from guided wave signals , 2003, IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control.

[10] Mathias Fink,et al. Separation of interfering acoustic scattered signals using the invariants of the time-reversal operator. Application to Lamb waves characterization , 1998 .