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 language | English |
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| Title of host publication | Institution of Mechanical Engineers - 9th International Conference on Vibrations in Rotating Machinery|Inst. Mech. Eng. - Int. Conf. Vib. Rotating Mach. |
| Pages | 565-572 |
| Number of pages | 7 |
| Volume | 2 |
| Publication status | Published - 2008 |
| Event | 9th International Conference on Vibrations in Rotating Machinery - Exeter Duration: 1 Jul 2008 → … |
Conference
| Conference | 9th International Conference on Vibrations in Rotating Machinery |
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| City | Exeter |
| Period | 1/07/08 → … |