A passive monitoring technique based on dispersion compensation to locate impacts in plate-like structures

A method for impact location in plate-like structures is proposed. The approach is based on guided waves dispersion compensation. Procedures based on dispersion compensation are usually applied to active monitoring techniques, as they require the knowledge of the time of impact to effectively compensate the guided waves dispersive behaviour. Unfortunately, this knowledge is not given in passive monitoring techniques. Despite this limit, the proposed dispersion compensation procedure is useful as it removes in the group delay of the acquired signals the dependence on the travelled distance. By cross-correlating the signals related to the same event acquired by different sensors, the difference in travelled distances can be determined and used to locate the wave source via hyperbolic positioning. The results show that the developed tool could pave he way for a new class of procedures to locate impacts in waveguides.

[1]  H. Ermert,et al.  Chirp signal matching and signal power optimization in pulse-echo mode ultrasonic nondestructive testing , 1994, IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control.

[2]  Tribikram Kundu,et al.  Detection of the point of impact on a stiffened plate by the acoustic emission technique , 2009 .

[3]  Grabec,et al.  Location of acoustic emission sources generated by air flow , 2000, Ultrasonics.

[4]  Philippe Micheau,et al.  Chirplet-based imaging using compact piezoelectric array , 2010, Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring.

[5]  Laurence J. Jacobs,et al.  Automated methodology to locate notches with Lamb waves , 2001 .

[6]  Stefan Hurlebaus,et al.  Localization of notches with Lamb waves. , 2003, The Journal of the Acoustical Society of America.

[7]  Francesco Ciampa,et al.  Acoustic emission source localization and velocity determination of the fundamental mode A0 using wavelet analysis and a Newton-based optimization technique , 2010 .

[8]  Fu-Kuo Chang,et al.  Impact identification of stiffened composite panels: I. System development , 2001 .

[9]  Ivan Bartoli,et al.  A semi-analytical finite element formulation for modeling stress wave propagation in axisymmetric damped waveguides , 2008 .

[10]  Massimo Ruzzene,et al.  Warped basis pursuit for damage detection using lamb waves , 2010, IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control.

[11]  Massimo Ruzzene,et al.  Experimental characterization of periodic frequency-steerable arrays for structural health monitoring , 2010 .

[12]  A. K. Booer,et al.  Fast numerical algorithm for the recompression of dispersed time signals , 1977 .

[13]  D. Marquardt.  An Algorithm for Least-Squares Estimation of Nonlinear Parameters , 1963 .

[14]  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.

[15]  Laurence J. Jacobs,et al.  Lamb wave characterization by differential reassignment and non-linear anisotropic diffusion , 2006 .

[16]  Lin Ye,et al.  Guided Lamb waves for identification of damage in composite structures: A review , 2006 .

[17]  F. L. D. Scalea,et al.  Macro-fiber composite piezoelectric rosettes for acoustic source location in complex structures , 2007 .

[18]  R. Sullivan.  Radar Foundations for Imaging and Advanced Concepts , 2004 .

[19]  W. Staszewski,et al.  Impact damage location in composite structures using optimized sensor triangulation procedure , 2003 .

[20]  Fu-Kuo Chang,et al.  Identifying Impacts in Composite Plates with Piezoelectric Strain Sensors, Part II: Experiment , 1998 .

[21]  Carlos E. S. Cesnik,et al.  Review of guided-wave structural health monitoring , 2007 .

[22]  Larry C. Andrews,et al.  Random Data Analysis , 2012 .

[23]  D. Zellouf,et al.  A numerical dispersion compensation technique for time recompression of Lamb wave signals. , 2002, Ultrasonics.

[24]  A. Raghavan,et al.  Guided-wave signal processing using chirplet matching pursuits and mode correlation for structural health monitoring , 2007 .

[25]  Salvatore Salamone,et al.  High-velocity Impact Location on Aircraft Panels Using Macro-fiber Composite Piezoelectric Rosettes , 2010 .

[26]  P. H. White.  Cross Correlation in Structural Systems: Dispersion and Nondispersion Waves , 1969 .

[27]  Carlos E. S. Cesnik,et al.  Guided wave excitation by a CLoVER transducer for structural health monitoring: theory and experiments , 2009 .

[28]  L. De Marchi,et al.  Ultrasonic guided-waves characterization with Warped Frequency Transforms , 2008, 2008 IEEE Ultrasonics Symposium.

[29]  Jonghyun Park,et al.  Monitoring Impact Events Using a System-Identification Method , 2009 .

[30]  Nicolò Speciale,et al.  Fast Computation of Frequency Warping Transforms , 2010, IEEE Transactions on Signal Processing.

[31]  Keith Worden,et al.  Fail-safe sensor distributions for impact detection in composite materials , 2000 .