Static and dynamic characteristics of externally pressurized annular porous gas thrust bearings

Abstract

This article studies the static load capacity, dynamic stiffness, and damping coefficient of the externally pressurized annular porous gas thrust bearings. The Reynolds equation for the bearing is established using linear perturbation; for the first time, three degrees of freedom are considered in the modeling. The steady state equations are solved to obtain the static load capacity, and the first-order perturbation equations are solved for the dynamic characteristics. The influences of various bearing parameters on the static and dynamic characteristics are evaluated. Results from the numerical simulation prove that the proposed method is a valid mean of estimating the static and dynamic characteristics of the porous gas thrust bearings.

Keywords

Porous gas thrust bearing dynamic characteristics static load capacity

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References

Kwan

YBP

Corbett

. Porous aerostatic bearings-an updated review. Wear 1998; 222: 69–73.

Sheinberg

Shuster

. Resistance to vibration of a hydrostatic thrust bearing. Mach Tool 1960; 31: 24–29.

Taylor

Lewis

. Experience relating to the steady performance of aerostatic porous thrust bearings. Proc IMechE 1975; 189: 383–390.

Singh

Rao

. Static characteristics of aerostatic porous rectangular thrust bearings. Wear 1982; 77: 229–236.

Luonga

Potzea

Posta

. Numerical and experimental analysis of aerostatic thrust bearings with porous restrictors. Tribol Int 2004; 37: 825–832.

Tian

. Static study of the porous bearings by the simplified finite element analysis. Wear 1998; 218: 203–209.

Kwan

YBP

Corbett

. A simplified method for the correction of velocity slip and inertia effects in porous aerostatic thrust bearings. Tribol Int 1998; 31: 779–786.

Singh

Rao

Majumdar

BBC

. Steady-state characteristics of aerostatic porous rectangular thrust bearings incorporating the effects of velocity slip, anisotropy and tilt. Proc IMechE, Part C: J Mechanical Engineering Science 1983; 25: 179–188.

Mori

Yabe

Ono

. Theory of externally pressurized circular thrust porous gas bearing. J Fluids Eng 1965; 87: 613–620.

10.

Majumdar

. Dynamic characteristics of externally pressurized rectangular porous gas thrust bearings. J Tribol 1976; 98: 181–186.

11.

Majumdar

. Dynamic characteristics of aerostatic thrust bearings with porous inserts. Proc IMechE, Part C: J Mechanical Engineering Science 1980; 22: 55–58.

12.

Majumdar

Schmidt

. Design of externally pressurized rectangular porous thrust bearings. Wear 1975; 32: 1–8.

13.

Rao

Majumdar

. Dynamic stiffness and damping coefficients of aerostatic, porous, journal bearings. Proc IMechE, Part C: J Mechanical Engineering Science 1978; 20: 291–296.

14.

Taylor

. A numerical solution of the dynamic characteristics of an aerostatic, porous thrust bearing having a uniform film subjected to linear axial load variations. Proc IMechE, Part C: J Mechanical Engineering Science 1977; 19: 122–127.

15.

Yoshimoto

Kohno

. Static and dynamic characteristics of aerostatic circular porous thrust bearings (effect of the shape of the air supply area). J Tribol, Trans ASME 2001; 123: 501–508.

16.

Jang

Kim

. Calculation of dynamic coefficients in a hydrodynamic bearing considering five degrees of freedom for a general rotor-bearing system. J Tribol, Trans ASME 1999; 121: 499–505.