Influence of Eccentricity and Angular Velocity on Force Effects on Rotor of Magnetorheological Damper

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.

Research of Flow Stability of Non-Newtonian Magnetorheological Fluid Flow in the Gap between Two Cylinders

“…The finite volume method was used to solve the mathematical models. The mathematical models in MATLAB and ANSYS Fluent were solved for simplified geometries (one-dimensional and two-dimensional) and a simplified viscosity definition [27,28]. A comprehensive solution using ANSYS Fluent will be presented in Section 5.…”

“…Verified mathematical models of single-phase Newtonian isothermal fluid were the basis for modeling magnetorheological fluid, while there is experience with the flow of individual fluids [24,27,28]. The liquids were considered as incompressible fluids, because their densities were not significantly pressure-dependent.…”

Multiphase Flow in the Gap Between Two Rotating Cylinders

“…The following article is focused on the research of Newtonian fluids, where the basic flow characteristics are verified on the basis of computational modeling and experiment. Due to the fact that flow instabilities penetrate at the interface of immiscible liquids, we decided to study the behavior of immiscible liquids in the area where another type of instability manifests itself, ie Taylor's vortex, because this issue is described in sufficient detail in [1,2,3,4,5].…”