The purpose of this effort was to develop a system to detect, discriminate and track fatigue cracks in rotating disks. Aimed primarily at jet engines in flight applications, the system also has value for detecting cracks in a spin pit during low cycle fatigue testing, and for monitoring the health of steam turbines and land-based gas turbine engines for maintenance purposes. The results of this effort produced: a physics-based model that describes the change in the center of mass of a rotating disk using damping ratio, initial unbalance and crack size as parameters; the development of a data acquisition and analysis system that can detect and discriminate a crack using a single cycle of data; and initial validation of the model through testing in a spin pit. The development of the physics-based model also pointed to the most likely regimes for crack detection; identified specific powers of omega to search for in specific regimes; dictated a particular type of data acquisition for crack discrimination; and demonstrated a need for a higher signal-to-noise ratio in the measurement of the basic vibration signal.


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    Title :

    Detection, discrimination and real-time tracking of cracks in rotating disks


    Contributors:
    Haase, W.C. (author) / Drumm, M.J. (author)

    Published in:

    Publication date :

    2002


    Size :

    10 Seiten, 8 Quellen




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English






    Detection, discrimination, and real-time tracking of cracks in rotating disks [4704-22]

    Haase, W. C. / Drumm, M. J. / International Society for Optical Engineering | British Library Conference Proceedings | 2002



    Real-time Detection of Developing Cracks in Jet Engine Rotors

    Sonnichsen, H. E. / Institute of Electrical and Electronics Engineers | British Library Conference Proceedings | 2000