Engineering topics
Publications and source records attributed to Fleming, D. P..
Program evaluates a series hybrid, fluid film ball bearing consisting of an orifice compensated pressurized thrust bearing in conjunction with a self-acting journal bearing. Oil viscosities corresponding to experimentally measured ball bearing outer-race temperatures were used.
The series-hybrid bearing couples a fluid-film bearing with a rolling-element bearing such that the rolling-element bearing inner race runs at a fraction of shaft speed. A series-hybrid bearing was analyzed and experiments were run at thrust loads from 100 to 300 lb and speeds from 4000 to 30,000 rpm. Agreement between theoretical and experimental speed sharing was good. The lowest speed ratio (ratio of ball bearing inner-race speed to shaft speed) obtained was 0.67. This corresponds to an approximate reduction in DN value of 1/3. For a ball bearing in a 3 million DN application, fatigue life would theoretically be improved by a factor as great as 8.
Herringbone grooved gas lubricated journal bearing load capacity, attitude angle and power loss measurements
Fluid film bearing of hybrid device consists of orifice compensated annular thrust bearing and self-acting journal bearing. In series hybrid bearing, both ball bearing and annular thrust bearing carry full system thrust load, but two bearings share speed. Operation of system is stable and automatically fail-safe.
Computer program for determination of optimal herringbone journal bearings for maximum radial load capacity
Self acting herringbone journal bearings optimization program for maximum radial load capacity and wide operating range via groove configurations
Computer analysis of pressurized thrust bearing design using incompressible lubricant
Computerized optimization of self acting herringbone journal bearings for maximum radial load capacity
Evaluating series hybrid bearing concept by testing lubricated fluid film thrust bearing at high speed
Load capacity, attitude angle, and power loss were determined for 1-1/2-in.-diam herringbone grooved journal bearings operating in air to speeds of 60,000 rpm. Results showed that groove-to-ridge-clearance ratios of 2.0 to 2.4 give a greater load capacity than do ratios outside this optimum range. Agreement with a small-eccentricity pressure perturbation theory was good for groove-to-ridge-clearance ratios in the optimum range. Power loss, relative to that calculated for a plain bearing of the same dimensions, did not vary widely for the range of geometric variables used. Relative power loss generally increased with speed and was generally comparable to that for a plain bearing.
Evaluation of series-hybrid rolling-element bearing
Steady-state and stability analysis of externally pressurized gas-lubricated journal bearings with herringbone grooves
Experimental load capacity and power loss of herringbone grooved gas lubricated journal bearings
Eccentricity analysis to predict load capacity and stability
Externally pressurized air journal bearings load capacity, film stiffness, attitude-eccentricity locus and mass flow, studying supply pressure and shaft rotation effects
Externally pressurized gas lubricated journal bearings zero load rotating stability, using digital computer
Load and stiffness characteristics of rotating externally pressurized air journal bearings
Stability of water lubricated herringbone groove journal bearings