Higher Order Coherences for fatigue crack detection

    Research output: Contribution to journalArticlepeer-review


    Higher Order Coherences (normalized Higher Order Spectra) are the tools to identify the relationship between the different harmonic components in a signal. The vibration of a structure having a crack also generates several harmonics of the exciting frequency due to its breathing (closing and opening) behaviour which is a non-linear phenomenon. Presently two types of the HOC - namely, the Bicoherence and the Tricoherence, are used for the fatigue crack detection. This paper presents the observations made on the HOC on the numerically simulated experiment of a cantilever beam with and without cracks. The robustness of the HOC in the crack detection even for the noisy response vibration data has also been brought out. © 2008 Elsevier Ltd. All rights reserved.
    Original languageEnglish
    Pages (from-to)534-538
    Number of pages4
    JournalEngineering Structures
    Issue number2
    Publication statusPublished - Feb 2009


    • Bicoherence
    • Fatigue crack
    • Higher Order Coherences
    • Tricoherence
    • Vibration responses


    Dive into the research topics of 'Higher Order Coherences for fatigue crack detection'. Together they form a unique fingerprint.

    Cite this