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In this article it has been sought to study the effect of transverse roughness on the behaviour of slider bearings with squeeze film formed by a magnetic fluid. The roughness of the bearing surface is modelled by a stochastic random variable with non zero mean, variance and skewness. The associated Reynolds' equation is stochastically averaged with respect to the random roughness parameter. Results...
On the basis of Christensen’s stochastic model of rough surfaces, different forms of Reynolds equation with rotational inertia effect are obtained for various types of surface roughness pattern and for couple stress lubricant. As results one obtained the formulae expressing the mean film pressure distribution for externally pressurized bearings and for bearings with a squeeze film. Examples of spherical...
A numerical procedure incorporating cavitation effects on the dynamics of journal bearings is presented. A two-dimensional linear stability analysis considering the fluid flow in both full film and cavitation regions for a plain cylindrical journal bearing and four multi-lobe bearings are presented. The Lund’s infinitesimal perturbation procedure is applied to Elrod’s universal equation for evaluation...
It has recently been demonstrated that high-speed grinding principles can be applied to the finishing of silicon nitride (ceramic) with considerable improvements in throughput, costs, and quality. This will require new high-speed high-power centerless grinding machines (7.000 rpm, 50 hp), with high-stiffness (2.000.000 lb/in) spindles. To meet the life, stiffness and speed requirements of this next...
In this researeh, an experimental test device of the spiral groove bearing (SGB) spindle is developed. The dynamic characteristics of the SGB spindle are investigated. The effects of rotating speed, load and bearing clearance on the dynamic characteristics are considered. lt is found that both radial and axial non-repeatable run out (NRRO) decrease with the increase of rotating speed of the spindle...
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