Dynamic modeling and analysis of the different cavity-type hydrostatic slide turntable system
In this paper, a nonlinear oil-film force model with velocity term for hydrostatic slide system with rectangular, sector and round chamber is established respectively, by eliminating the small amount after the dimensional analysis with the help of Navier-Stokes equation, and combining with the oil-film bearing model of Hydrostatic Slide System of constant oil supply. And the turntable dynamic equations of hydrostatic slide system with different chambers are formulated consequently. Furthermore, the analysis of dynamics properties of the hydrostatic slide turntable with the same oil chamber area is investigated by numerical simulation. This research provide theoretical bases of the further studying and improving of the rest aspects property of hydrostatic oil film-turntable system.
A Database Method of Nonlinear Oil Film Force Based on Poincare Transformation
A database method to get nonlinear oil film force of the finite width hydrodynamic journal bearings is presented. Thus some state variables are transformed from infinite to finite by using Poincare transformation and a nonlinear oil film force database of hydrodynamic bearings is established in the transformed phase space by solving Reynolds equation. The nonlinear oil film force with respect to state variables can be obtained from the database in a shorted time. The accuracy of the database is testified using time transient analysis of practical journal bearing and Poincare mapping method.
Role of circumferential flow in the stability of fluid-handling machine rotors
The recent studies of the dynamic stiffness properties of fluid lubricated bearing and seals by the authors have yielded most of the generalized characteristics discussed and used in this paper. They include bearing and seal nonlinear fluid film properties associated with stiffness, damping, and fluid average circumferential velocity ratio. Analytical relationships yield the rotor system's dynamic stiffness characteristics. This paper shows the combination of these data to provide the fluid-induced rotor stability equations.