Search results for " perturbation approach"

showing 2 items of 2 documents

Nonlinear analysis of cylindrical and conical hysteretic whirl motions in rotor-dynamics

2014

Abstract The internal friction of a rotor–shaft-support system is mainly due to the shaft structural hysteresis and to some possible shrink-fit release of the assembly. The experimentation points out the destabilizing effect of the internal friction in the over-critical rotor running. Nevertheless, this detrimental influence may be efficiently counterbalanced by other external dissipative sources located in the supports or by a proper anisotropic configuration of the support stiffness. The present analysis considers a rotor–shaft system which is symmetric with respect to the mid-span and is constrained by viscous-flexible supports with different stiffness on two orthogonal planes. The cylin…

EngineeringAcoustics and Ultrasonicsbusiness.industryRotor (electric)Mechanical EngineeringRotation around a fixed axisStiffnessConical surfaceDissipationCondensed Matter PhysicsSettore ING-IND/13 - Meccanica Applicata Alle Macchinelaw.inventionNonlinear systemHysteresisClassical mechanicsMechanics of MaterialslawDissipative systemmedicineRotor-dynamics cylindrical and conical whirl nonlinear rotor-shaft hysteresis perturbation approach.medicine.symptombusinessJournal of Sound and Vibration
researchProduct

Approach to rotor-shaft hysteretic whirl using Krylov-Bogoliubov techniques

2013

The internal friction associated with the shaft hysteresis or with the possible release of some shrink-fit coupling exerts a destabilizing effect on the over-critical rotor running, but may be efficiently counteracted by other external dissipative sources or by a proper anisotropic configuration of the support stiffness. The present analysis considers a symmetric rotor-shaft system on viscous-flexible supports with different stiffness on two orthogonal planes containing the bearing axis. The internal friction of the shaft is described either by a linear hysteretic model or by a nonlinear Coulombian force contrasting the rotor motion relative to the shaft ends. The nonlinear equations of mo…

PhysicsCouplingRotor (electric)Mechanical EngineeringAerospace EngineeringRotordynamicsInternal frictionlaw.inventionHysteresisMechanics of MaterialslawControl theoryRotordynamics whirl rotor-shaft hysteresis non-linear model perturbation approachNonlinear modelAutomotive EngineeringGeneral Materials Science
researchProduct