Damage localisation in beam-like structures using high-order mode shape

This paper investigates the application and reliability of using mode shape in damage detection and localisation of beam-like structures. This is based on the fact that mode shape is function of the physical properties of the structure. Therefore, changes in the physical properties will cause detectable changes in the mode shape [1]. Numerical study has been carried out for low and high-order mode shapes of cantilever steel beam models. This is done using modal analysis in Ansys, a FEA commercial software, by introducing a single damage in the form of localised cross section reduction. The ANSYS model is validated using the comparison of numerical naturel frequencies with experimental frequencies of cantilever beam. The results demonstrate that high-order mode shapes are more likely to indicate damage location than either low-order mode shapes of beam even for a small amount of damage.

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