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.
The nonlinear oil film pressure's analytical method of sliding bearing by the application software of MSC.Marc
The mathematical equations of dynamic pressure of oil film were deduced according to the hydro-lubrication theory and Reynolds equations.With the comparison of the pressure in the different methods of calculation,the analysis and calculating means of the pressure and the load capacity of oil film were presented by the application software of finite element analysis,MSC.Marc.A practical sample was simulated and calculated with it.The numerous results indicate that it takes on favorable emulation effects.It can be applicable for diversified and complicated sliding bearing.Simultaneously the so precise calculating results provide a base for the stability of the rotor-bearing system.
Study of Nonlinear Dynamic Characteristics of Turbine Rotor System under Oil-film Force Alford Force and Quality Eccentricity
Based on the Jeffcott rotor model system,the dynamic characteristics of rotor were analyzed with Alford force model and unsteady oil-film model.Numerical simulation technique was used for analyzing the bifurcation and chaos characteristics of rotor system,and the dynamic characteristics of rotor under the increasing rotary speed and quality eccentricity were studied in details.The results of calculation present that,the chaos occurs through the periodic-doubling bifurcations with increasing rotary speed,and when fixing the rotary speed,the chaos occurs through the probable periodic motion under oil-film force,Alford force and increasing quality eccentricity.