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- On the stabilising effect of gyroscopic moments in an automotive turbocharger
- Univ Southampton
- Universidade Estadual Paulista (UNESP)
- Institute of Sound and Vibration Research, University of Southampton, UK
- Automotive turbochargers, which operate at very high speeds, exceeding 180,000 r/min, exhibit two strong sub-harmonic modes of vibrations due to oil-whirl instability. These are a conical mode and an in-phase whirl mode. The gyroscopic effects can be very important in such a rotor system. This article presents a theoretical investigation into these effects on the conical whirl instability of a turbocharger induced by the angular (tilting) motion of a rigid rotor. A simplified linear model is used to analyse the rotor-bearing system by investigating the effects of the gyroscopic moment on the internal moments. A gyroscopic coefficient, defined by the geometry of the rotor, is shown to govern the stability of the conical whirl motion. A threshold value of 1/2 is determined for this coefficient to suppress the conical whirl. This value remains unaffected if the rotor is asymmetric and is supported by floating ring bearings, which is the case in a practical turbocharger.
- Proceedings of The Institution of Mechanical Engineers Part C-Journal of Mechanical Engineering Science. London: Sage Publications Ltd, v. 226, n. C10, p. 2485-2495, 2012.
- Sage Publications Ltd
- Gyroscopic effect
- linear analysis
- conical whirl instability
- Acesso restrito
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