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Structural Monitoring and Maintenance
  Volume 1, Number 3, September 2014, pages 309-322
open access

Application of curvature of residual operational deflection shape (R-ODS) for multiple-crack detection in structures
Erfan Asnaashari and Jyoti K. Sinha

    Detection of fatigue cracks at an early stage of their development is important in structural health monitoring. The breathing of cracks in a structure generates higher harmonic components of the exciting frequency in the frequency spectrum. Previously, the residual operational deflection shape (R-ODS) method was successfully applied to beams with a single crack. The method is based on the ODSs at the exciting frequency and its higher harmonic components which consider both amplitude and phase information of responses to map the deflection pattern of structures. Although the R-ODS method shows the location of a single crack clearly, its identification for the location of multiple cracks in a structure is not always obvious. Therefore, an improvement to the R-ODS method is presented here to make the identification process distinct for the beams with multiple cracks. Numerical and experimental examples are utilised to investigate the effectiveness of the improved method.
Key Words
    multiple-crack detection; crack breathing; dynamic characterisation; frequency spectrum; operational deflection shape
Erfan Asnaashari and Jyoti K. Sinha:Dynamics Laboratory, School of Mechanical, Aerospace and Civil Engineering, University of Manchester, Sackville Street, Manchester M13 9PL, UK

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