Simplified Models for the Location of Cracks in Beam Structures using Measured Vibration Data

JK Sinha, MI Friswell & S Edwards (University of Wales Swansea)

Journal of Sound and Vibration, Vol. 251, No. 1, March 2002, pp. 13-38


A new simplified approach to modeling cracks in beams undergoing transverse vibration is presented. The modeling approach uses Euler-Bernoulli beam elements with small modifications to the local flexibility in the vicinity of cracks. This crack model is then used to estimate the crack locations and sizes, by minimizing the difference between the measured and predicted natural frequencies via model updating. The uniqueness of the approach is that the simplified crack model allows the location and damage extent to be estimated directly. The simplified crack model may also be used to generate training data for pattern recognition approaches to health monitoring. The proposed method has been illustrated using experimental data on beam examples.

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The coefficients of k22, k24 and k44 in Equation (8) should be changed to 2 rather than 12. Note that the correct coefficients were used in the examples.

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Link to paper using doi:10.1006/jsvi.2001.3978

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