ABSTRACT
Figure 1 shows schematic diagram of the gas-lubricated journal bearing with three axial grooves.
1 INTRODUCTION
The gas-lubricated journal bearings have been widely used in the rotating machinery [1-4]. The gas is dragged into the clearance between the bearing and the rotor, and then a hydrodynamic gas film is formed when the rotating machine works. The gas film can provide high stiffness, but is never broken down during starting, running, and stopping. More recently, many scholars have paid attention to surface texturing. Blatter et al. [5] applied a laser ablation technique to fabricate the surface of sapphire plates for studying the effect of the patterns of grooves on the sliding friction. Experimental results showed that wear could be reduced by an appropriate size and form of the micropattern. Ogawa et al. [6] examined the effect of dimple and groove textures on the tribological properties of slideways and has concluded that the friction coefficient can be reduced by texturing dimples and grooves on the contacting surface. Tala-ighol et al. [7] studied the tribological performance of the contacting surface by optimizing the geometric parameters of textured surfaces. It was found that
The dimensionless steady Reynolds equation of the gas-lubricated journal bearing with three axial grooves is described as follows:
∂ ∂
∂ ∂
⎛ ⎝⎜
⎞ ⎠⎟ +
∂ ∂
∂ ∂
⎛ ⎝⎜
⎞ ⎠⎟ =
∂ ∂ϕ ϕ λ λ ϕ
PH P
PH P3 3 Λ ( )PH (1)
where P = p/pa is the dimensionless pressure distribution, pa is the ambient pressure, H is the dimensionless gas gap between the journal and the bushing, ϕ and λ are the coordinates for calculation which are shown in Figure 2, Λ = ( / ) ( / )2μ p Ra is the bearing number.
