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Detection of structural heteregoneities by the wavelet technique

Marcinowski J.

International Journal of Applied Mechanics and Engineering

2007

Vol. 12, no 2

487-495

This paper deals with a special technique of a structural damage detection. To detect the location of the damage the source signal in the form of a structural response signal must be known. A displacement, strains or temperature distribution measured in a structural member are examples of such signals. The typical signal registered on an actual structure is not distinct enough to facilitate the localization of structural or material heterogeneities in a structural member. The wavelet anaIysis acts as a kind of a magnifying glass. It enables the detection of locaI disturbances not visible for the naked eye. In this paper, the effectiveness of discrete wavelet transform in a determination of local disturbances of a source signal caused by structural heterogeneities was presented. The source signal was obtained from the numerical simulation of bending of steel beam in which a narrow notch was cut. It was shown that as a result of the procedure adopted the location of the notch was determined very accurately.