Fusion of modal strain energy differences for localization of damage

Roberto A. Osegueda; Arturo Revilla; Leopoldo R. Pereyra; Oscar Moguel

doi:10.1117/12.339886

28 January 1999 Fusion of modal strain energy differences for localization of damage

Roberto A. Osegueda, Arturo Revilla, Leopoldo R. Pereyra, Oscar Moguel

Proceedings Volume 3586, Nondestructive Evaluation of Aging Aircraft, Airports, and Aerospace Hardware III; (1999) https://doi.org/10.1117/12.339886
Event: Nondestructive Evaluation Techniques for Aging Infrastructures and Manufacturing, 1999, Newport Beach, CA, United States

Abstract

The fusion of multiple modal strain energy differences is proposed for the detection of damage at single and multiple locations. The approaches assume the existence of several modal shapes of the structure in the undamaged and damaged states. Modal curvatures obtained through iterative high- order spline fits of the shapes permit the determination of the modal strain energy content of the structure in both states. Locations with increases in the modal strain energy between the undamaged and damaged structure are indicative of possible damage. The damage indications resulting from multiple modes are fused according to three rules: (1) an Average Standard Norm, (2) a union of probability mass functions and (3) a weighted intersection of the probabilities that the strain energy are greater than zero. the third rule requires knowledge of the statistics of the modal shape measurements. While not strictly adhering to the classical data fusion methodologies such as, Dempster-Shafer or Bayesian, the combination of information at the probabilistic level yields result that are consistent with those expected in a formal data fusion formulation. The fusion algorithms for the location of damage are tested using five modal shapes obtained from aluminum beams in undamaged and damaged states. One and two locations at different damage magnitudes are considered. The results indicate that the last two approaches are superior to the standard norm method.

Citation Download Citation

Roberto A. Osegueda, Arturo Revilla, Leopoldo R. Pereyra, and Oscar Moguel "Fusion of modal strain energy differences for localization of damage", Proc. SPIE 3586, Nondestructive Evaluation of Aging Aircraft, Airports, and Aerospace Hardware III, (28 January 1999); https://doi.org/10.1117/12.339886

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