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dc.contributor.authorHemmati, Farzad
dc.contributor.authorMiraskari, Mohammad
dc.contributor.authorGadala, Mohamed S.
dc.date.accessioned2021-12-22T13:27:45Z
dc.date.available2021-12-22T13:27:45Z
dc.date.issued2017-04
dc.identifier.citationHemmati, F., Miraskari, M., & Gadala, M. S. (2017). Dynamic analysis of short and long journal bearings in laminar and turbulent regimes, application in critical shaft stiffness determination. Applied Mathematical Modelling, 48, 451-475.en_US
dc.identifier.urihttps://dspace.adu.ac.ae/handle/1/1908
dc.descriptionThe demand for high pressure injection of natural gas in underground has led to the design of multistage compressors. In 1970s many of such compressors were suffering from violent sub-synchronous whirl [1], a form of self-excited instability. In turbo-machinery, instabilities are characterized by whirling of the rotor bearing systems at frequencies other than the rotating frequency of the shaft.en_US
dc.description.abstractLinear and non-linear stability of a flexible rotor-bearing system supported on short and long journal bearings is studied for both laminar and turbulent operating conditions. The turbulent pressure distribution and forces are calculated analytically from the modified Reynolds equation based on two turbulent models; Constantinescu's and Ng–Pan–Elrod. Hopf bifurcation theory was utilized to estimate the local stability of periodic solutions near bifurcating operating points. The shaft stiffness was found to play an important role in bifurcating regions on the stable boundaries. It was found that for shafts supported on short journal bearings with shaft stiffness above a critical value, the dangerous subcritical region can be eliminated from a range of operating conditions with high static load. The results presented have been verified by published results in the open literature.en_US
dc.language.isoen_USen_US
dc.publisherElsevieren_US
dc.subjectLinear and nonlinear stability analysisen_US
dc.subjectHopf bifurcation theoryen_US
dc.subjectShort and long journal bearingsen_US
dc.subjectConstantinescu's and Ng−Pan−Elrod turbulent modelsen_US
dc.subjectCritical shaft stiffnessen_US
dc.titleDynamic analysis of short and long journal bearings in laminar and turbulent regimes, application in critical shaft stiffness determinationen_US
dc.title.alternativeApplied Mathematical Modellingen_US
dc.typeArticleen_US
dc.identifier.doihttp://dx.doi.org/10.1016/j.apm.2017.04.013


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