TY - GEN
T1 - An improved technique for modal decomposition of a double-mode Lamb wave signal
AU - Luangvilai, K.
AU - Jacobs, L. J.
AU - Qu, Jianmin
PY - 2006
Y1 - 2006
N2 - This study develops a technique to decompose a multi-mode, transient Lamb wave signal into individual Lamb mode signals. The previously-proposed technique (presented at the SPIE NDE conference 2005) showed an encouraging efficiency for numerically-simulated signals, but suffered when evaluating real experimental signals due to its high sensitivity to noises and experimental errors, The improved technique starts with the same assumption of known Lamb wave propagation characteristics (known propagation dispersion curves). However, a highly-strict signal model governing the development of the previously-proposed technique is relaxed to tolerate unavoidable presence noises and errors, and the problem is re-formulated. For actual experimental signals, some additional signal processing techniques are introduced in signal pre-conditioning. The entire implementation of the improved technique is first tested with simulated signals, and then applied to actual experimental signals. The final results with real experimental are presented and discussed.
AB - This study develops a technique to decompose a multi-mode, transient Lamb wave signal into individual Lamb mode signals. The previously-proposed technique (presented at the SPIE NDE conference 2005) showed an encouraging efficiency for numerically-simulated signals, but suffered when evaluating real experimental signals due to its high sensitivity to noises and experimental errors, The improved technique starts with the same assumption of known Lamb wave propagation characteristics (known propagation dispersion curves). However, a highly-strict signal model governing the development of the previously-proposed technique is relaxed to tolerate unavoidable presence noises and errors, and the problem is re-formulated. For actual experimental signals, some additional signal processing techniques are introduced in signal pre-conditioning. The entire implementation of the improved technique is first tested with simulated signals, and then applied to actual experimental signals. The final results with real experimental are presented and discussed.
KW - Double-mode Lamb waves
KW - Modal decomposition
KW - Signal processing technique
UR - http://www.scopus.com/inward/record.url?scp=33749579382&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=33749579382&partnerID=8YFLogxK
U2 - 10.1117/12.658801
DO - 10.1117/12.658801
M3 - Conference contribution
AN - SCOPUS:33749579382
SN - 0819462292
SN - 9780819462299
T3 - Proceedings of SPIE - The International Society for Optical Engineering
BT - Nondestructive Evaluation and Health Monitoring of Aerospace Materials, Composites, and Civil Infrastructure V
T2 - Nondestructive Evaluation and Health Monitoring of Aerospace Materials, Composites, and Civil Infrastructure V
Y2 - 28 February 2006 through 2 March 2006
ER -