Transformation of Acoustic Emission Pattern Recognition Features

  • Mark A. Friesel
Part of the Review of Progress in Quantitative Nondestructive Evaluation book series


Probably the most persistent general problem in acoustic emission (AE) applications is signal source identification. Past applications of pattern recognition techniques to AE have been successful, but require measurement of a parameter such as source location, load, etc., which is well-correlated with specific source types, in addition to AE signal characteristics used as the basis of the feature [1,2]. A training set comprised of a subset of the test data has also been required since good classification features and the distribution of their values are only appropriate when applied to the specific test from which they were obtained. The solution to these problems is to find robust features, or a way to predict features and feature values. Some empirical work along these lines has been done by Pacific Northwest Laboratory (PNL), operated by Battelle Memorial Institute [1,3,4]. In this paper, a transfer function between power spectral density (PSD) feature sets is established to relate the responses of two detection channels to a given source. The method may aid in identifying robust features and in predicting feature value distributions from calibration and a priori information.


Transfer Function Acoustic Emission Power Spectral Density Acoustic Emission Signal Acoustic Emission Event 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. 1.
    P. H. Hutton, M. A. Friesel, L. J. Graham, R. K. Elsley, Develop In-Flight Acoustic Emission Monitoring of Aircraft to Detect Fatigue Crack Growth, NADC-81087–60, Battelle, Pacific Northwest Laboratories, Richland, Washington (1985). There is an error in App. A in the expression for the coefficients ak of the polynomial spline function, where Ak and Az should replace ak and az on the right-hand side.Google Scholar
  2. 2.
    P. G. Bentley and M. J. Beasley, J. Acous. Emission 2 (7), pp. 59–79 (1988).Google Scholar
  3. 3.
    M. A. Friesel, NDT Int’l., 19(3), June, pp. 203–206 (1986).Google Scholar
  4. 4.
    M. A. Friesel, Mat’ls Ev., 47(7), July, pp. 842–848 (1989).Google Scholar
  5. 5.
    K. Aki and Richards, P. G.,Quantitative Seismology, Vol. 1, ( W. H. Freeman & Co., New York, 1980 ).Google Scholar
  6. 6.
    N. N. Hsu and F. R. Breckenridge, Mat’ls. Eval., 39, Jan., pp. 60–68 (1981).Google Scholar
  7. 7.
    C. Chang and W. Sachse, J. Acoust. Soc. Am., 79 (5), pp. 1307–1316 (1986).CrossRefGoogle Scholar
  8. 8.
    K. F. Graff, Wave Motion In Elastic Solids, (Ohio State University Press, 1975).Google Scholar

Copyright information

© Springer Science+Business Media New York 1990

Authors and Affiliations

  • Mark A. Friesel
    • 1
  1. 1.Pacific Northwest LaboratoryOperated by Battelle Memorial InstituteRichlandUSA

Personalised recommendations