Abstract
This article presents the evaluation of force effects on squeeze film damper rotor. The rotor is placed eccentrically and its motion is translate-circular. The amplitude of rotor motion is smaller than its initial eccentricity. The force effects are calculated from pressure and viscous forces which were measured by using computational modeling. Damper was filled with magnetorheological fluid. Viscosity of this non-Newtonian fluid is given using Bingham rheology model. Yield stress is not constant and it is a function of magnetic induction which is described by many variables. The most important variables of magnetic induction are electric current and gap width between rotor and stator. The simulations were made in finite volume method based solver. The motion of the inner ring of squeeze film damper was carried out by dynamic mesh. Numerical solution was solved for five different initial eccentricities and angular velocities of rotor motion.
Highlights
Change of fluid properties in working damper is one of possible ways to improve damping ability of damper
Magnetorheological (MR) fluids are liquids which show fast transition from a liquid to a nearly solid state under the presence of external magnetic fields. Their viscosity depends on magnetic induction and therefor MR fluids belong to non-Newtonian fluids
Force effects on squeeze film damper were studied in paper [7].This article continues in research, which was started in work [7]
Summary
Change of fluid properties in working damper is one of possible ways to improve damping ability of damper Magnetorheological (MR) fluids are liquids which show fast transition from a liquid to a nearly solid state under the presence of external magnetic fields Their viscosity depends on magnetic induction and therefor MR fluids belong to non-Newtonian fluids. Shaft vibrations are generated from the imbalance rotor motion which can be caused by assembling or manufacturing inaccuracies These negative effects can be noticeably minimized if active or semi-active damping elements are installed between the shaft and the stationary part of the rotating machine. Force effects on squeeze film damper were studied in paper [7].This article continues in research, which was started in work [7]
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