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dc.contributor.authorMiraskari, Mohammad
dc.contributor.authorHemmati, Farzad
dc.contributor.authorS. Gadala, Mohamed
dc.descriptionMiraskari, M., Hemmati, F., & Gadala, M. S. (2018). Nonlinear Dynamics of Flexible Rotors Supported on Journal Bearings—Part I: Analytical Bearing Model. Journal of Tribology, 140(2), 021704.en_US
dc.description.abstractTo determine the bifurcation types in a rotor-bearing system, it is required to find higher order derivatives of the bearing forces with respect to journal velocity and position. As closed-form expressions for journal bearing force are not generally available, Hopf bifurcation studies of rotor-bearing systems have been limited to simple geometries and cavitation models. To solve this problem, an alternative nonlinear coefficient-based method for representing the bearing force is presented in this study. A flexible rotor-bearing system is presented for which bearing force is modeled with linear and nonlinear dynamic coefficients. The proposed nonlinear coefficient-based model was found to be successful in predicting the bifurcation types of the system as well as predicting the system dynamics and trajectories at spin speeds below and above the threshold speed of instability.en_US
dc.publisherAmerican Society of Mechanical Engineersen_US
dc.subjectDynamic Coefficientsen_US
dc.subjectNonlinear Bearing Modelen_US
dc.subjectRotor-Bearing Systemen_US
dc.subjectHopf Bifurcation Theoryen_US
dc.titleNonlinear Dynamics of Flexible Rotors Supported on Journal Bearings—Part I: Analytical Bearing Modelen_US

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