Bi-spectrum of a composite coherent cross-spectrum for faults detection in rotating machines

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    Abstract

    Fault keeps generating in rotating machines. The identification of different faults in rotating machines by vibration techniques is mainly related to the machines RPM and its harmonics and sub-harmonics in the measured vibration responses from number of bearing pedestals. The higher order spectra (HOS) are tools to relate different harmonics and sub-harmonics of a frequency in a signal. Recently this feature of the HOS has been used to identify the crack and misalignment in a rotor. This concept has further been extended here in the present study. Here a composite coherent cross-power spectrum (CCCS) has been derived for the measured vibration responses from all the bearing pedestals of a rotating machine and then the HOS, namely the Bi-spectrum of this coherent spectrum has been computed to enhance the discriminating feature for the fault identification. This has been demonstrated through a numerically simulated example of a rotor with a small crack.
    Original languageEnglish
    Title of host publicationInstitution of Mechanical Engineers - 9th International Conference on Vibrations in Rotating Machinery|Inst. Mech. Eng. - Int. Conf. Vib. Rotating Mach.
    Pages565-572
    Number of pages7
    Volume2
    Publication statusPublished - 2008
    Event9th International Conference on Vibrations in Rotating Machinery - Exeter
    Duration: 1 Jul 2008 → …

    Conference

    Conference9th International Conference on Vibrations in Rotating Machinery
    CityExeter
    Period1/07/08 → …

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