fundamentals of fluid film lubrication hamrock, schmid & jacobson isbn no. 0-8247-5371-2...
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Fundamentals of Fluid Film LubricationHamrock, Schmid & JacobsonISBN No. 0-8247-5371-2
Toroidal Vortex Flow
Figure 7.1 Toroidal vortex flow in a journal bearing.
Conditions for vortex flow:
Taylor Number:
Reynolds Number:
Fundamentals of Fluid Film LubricationHamrock, Schmid & JacobsonISBN No. 0-8247-5371-2
Mass Flow
Figure 7.1 Mass flow through rectangular-section control volume. (a) x-y plane; (b) y-z plane; (c) x-y plane. [From Hamrock and Dowson (1981).]
Fundamentals of Fluid Film LubricationHamrock, Schmid & JacobsonISBN No. 0-8247-5371-2
Reynolds Equation
Fundamentals of Fluid Film LubricationHamrock, Schmid & JacobsonISBN No. 0-8247-5371-2
Reynolds Equation Terms
Figure 7.3 Density wedge. Figure 7.4 Stretch mechanism.
Fundamentals of Fluid Film LubricationHamrock, Schmid & JacobsonISBN No. 0-8247-5371-2
Reynolds Equation Terms
Figure 7.5 Physical wedge mechanism.Figure 7.6 Normal squeeze mechanism.
Fundamentals of Fluid Film LubricationHamrock, Schmid & JacobsonISBN No. 0-8247-5371-2
Reynolds Equation Terms
Figure 7.7 Translation squeeze mechanism.
Figure 7.8 Local expansion mechanism.
Fundamentals of Fluid Film LubricationHamrock, Schmid & JacobsonISBN No. 0-8247-5371-2
Possible Motion in Bearings
Figure 7.9 Normal squeeze and sliding velocities.
Fundamentals of Fluid Film LubricationHamrock, Schmid & JacobsonISBN No. 0-8247-5371-2
Possible Motion in Bearings
Figure 7.9 Normal squeeze and sliding velocities.
Fundamentals of Fluid Film LubricationHamrock, Schmid & JacobsonISBN No. 0-8247-5371-2
Parallel-Surface Slider Bearing
Figure 8.1 Velocity profiles in a parallel-surface slider bearing.
Fundamentals of Fluid Film LubricationHamrock, Schmid & JacobsonISBN No. 0-8247-5371-2
Flow in Inclined Slider
Figure 8.2 Flow within a fixed-incline slider bearing (a) Couette flow; (b)
Poiseuille flow; (c) resulting velocity profile.
Fundamentals of Fluid Film LubricationHamrock, Schmid & JacobsonISBN No. 0-8247-5371-2
Thrust Bearing
Figure 8.3 Thrust bearing geometry.Figure 8.3 Force components and oil film geometry in a hydrodynamically lubricated thrust sector.
Fundamentals of Fluid Film LubricationHamrock, Schmid & JacobsonISBN No. 0-8247-5371-2
Parallel-Surface Bearing
Figure 8.5 Parallel-surface slider bearing.
Fundamentals of Fluid Film LubricationHamrock, Schmid & JacobsonISBN No. 0-8247-5371-2
Fixed-Incline Slider Bearing
Figure 8.6 Fixed-incline slider bearing.
Figure 8.7 Pressure distributions of fixed-incline slider bearing.
Fundamentals of Fluid Film LubricationHamrock, Schmid & JacobsonISBN No. 0-8247-5371-2
Fixed-Incline Bearing Results
Figure 8.8 Effect of film thickness ratio on normal load-carrying capacity.
Figure 8.9 Effect of film thickness ratio on force components.
Fundamentals of Fluid Film LubricationHamrock, Schmid & JacobsonISBN No. 0-8247-5371-2
Fixed-Incline Bearing Results
Figure 8.10 Effect of film thickness ratio on friction coefficient parameter.
Figure 8.11 Effect of film thickness ratio on dimensionless volume flow rate.
Fundamentals of Fluid Film LubricationHamrock, Schmid & JacobsonISBN No. 0-8247-5371-2
Fixed-Incline Bearing Results
Figure 8.12 Effect of film thickness ratio on dimensionless adiabatic temperature rise.
Figure 8.13 Effect of film thickness ratio on dimensionless center of pressure.
Fundamentals of Fluid Film LubricationHamrock, Schmid & JacobsonISBN No. 0-8247-5371-2
Streamlines in Fixed-Incline Slider Bearing
Figure 8.14 Streamlines in fixed-incline bearing at four film thickness ratios Ho. (a) Ho =2; (b) Ho =1 (critical value).
Fundamentals of Fluid Film LubricationHamrock, Schmid & JacobsonISBN No. 0-8247-5371-2
Streamlines in Fixed-Incline Slider Bearing
(cont.)
Figure 8.14 Concluded. (c) Ho = 0.5; (d) Ho = 0.25.
Fundamentals of Fluid Film LubricationHamrock, Schmid & JacobsonISBN No. 0-8247-5371-2
Parallel-Step Bearing
Figure 8.15 Parallel-step slider bearing.
Fundamentals of Fluid Film LubricationHamrock, Schmid & JacobsonISBN No. 0-8247-5371-2
Parallel-Step Pad Slider Bearing
Figure 9.1 Finite parallel-step-pad slider bearing.
Fundamentals of Fluid Film LubricationHamrock, Schmid & JacobsonISBN No. 0-8247-5371-2
Parallel-Step-Pad Bearing Results
Fundamentals of Fluid Film LubricationHamrock, Schmid & JacobsonISBN No. 0-8247-5371-2
Parallel-Step-Pad Bearing Results
Fundamentals of Fluid Film LubricationHamrock, Schmid & JacobsonISBN No. 0-8247-5371-2
Parallel-Step-Pad Bearing Results
Figure 9.3 Shrouded-step slider bearings. (a) Semicircular step; (b) truncated triangular step.
Fundamentals of Fluid Film LubricationHamrock, Schmid & JacobsonISBN No. 0-8247-5371-2
Fixed-Incline-Pad Slider Bearing
Figure 9.4 Side view of fixed-incline-pad bearing. [From Raimondi and Boyd (1955).]
Figure 9.5 Configurations of multiple fixed-incline-pad thrust bearing. [From Raimondi and Boyd (1955).]
Fundamentals of Fluid Film LubricationHamrock, Schmid & JacobsonISBN No. 0-8247-5371-2
Film Thickness for Given Surface Finish
Fundamentals of Fluid Film LubricationHamrock, Schmid & JacobsonISBN No. 0-8247-5371-2
Fixed-Incline Slider Results
Figure 9.6 Chart for determining minimum film thickness corresponding to
maximum load or minimum power loss for various pad proportions - fixed-incline-pad
bearings. [From Raimondi and Boyd (1955).]
Fundamentals of Fluid Film LubricationHamrock, Schmid & JacobsonISBN No. 0-8247-5371-2
Fixed-Incline Slider Results
Figure 9.7 Chart for determining minimum film thickness for fixed-incline-pad thrust bearings. [From Raimondi and Boyd (1955).]
Fundamentals of Fluid Film LubricationHamrock, Schmid & JacobsonISBN No. 0-8247-5371-2
Fixed-Incline Slider Results
Figure 9.8 Chart for determining dimensionless temperature rise due to viscous shear heating of lubricant in fixed-incline-pad thrust bearings. [From Raimondi and Boyd (1955)]
Fundamentals of Fluid Film LubricationHamrock, Schmid & JacobsonISBN No. 0-8247-5371-2
Fixed-Incline Slider Results
Figure 9.9 Chart for determining performance parameters of fixed-incline-pad thrust bearings. (a) Friction coefficient; (b) power loss. [From Raimondi and Boyd (1955)].
Fundamentals of Fluid Film LubricationHamrock, Schmid & JacobsonISBN No. 0-8247-5371-2
Fixed-Incline Slider Results
Figure 9.9 Concluded. (c) Lubricant flow; (d) lubricant side flow.
Fundamentals of Fluid Film LubricationHamrock, Schmid & JacobsonISBN No. 0-8247-5371-2
Pivoted-Pad Slider Bearing
Figure 9.10 Side view of pivoted-pad thrust bearing. [From Raimondi and Boyd (1955).]
Figure 9.11 Configuration of multiple pivoted-pad thrust bearing. [From Raimondi and Boyd (1955).]
Fundamentals of Fluid Film LubricationHamrock, Schmid & JacobsonISBN No. 0-8247-5371-2
Pivoted-Pad Slider Results
Figure 9.12 Chart for determining pivot location corresponding to maximum load or minimum power loss for various pad proportions - pivoted-pad bearings. [From Raimondi and Boyd (1955).]
Fundamentals of Fluid Film LubricationHamrock, Schmid & JacobsonISBN No. 0-8247-5371-2
Pivoted-Pad Slider Results
Figure 9.13 Chart for determining outlet film thickness for pivoted-pad thrust bearings. [From Raimondi and Boyd (1955).]
Figure 9.14 Chart for determining dimensionless temperature rise due to viscous shear heating of lubricant for pivoted-pad thrust bearing. [From Raimondi and Boyd (1955).]
Fundamentals of Fluid Film LubricationHamrock, Schmid & JacobsonISBN No. 0-8247-5371-2
Pivoted-Pad Slider Results
Figure 9.15 Chart for determining performance parameters for pivoted-pad thrust bearings. (a) Dimensionless load; (b) friction coefficient. [From Raimondi and Boyd (1955).]
Fundamentals of Fluid Film LubricationHamrock, Schmid & JacobsonISBN No. 0-8247-5371-2
Pivoted-Pad Slider Results
Figure 9.15 Concluded. (c) Lubricant flow; (d) lubricant side flow; (e) power loss.
Fundamentals of Fluid Film LubricationHamrock, Schmid & JacobsonISBN No. 0-8247-5371-2
Journal Bearing
Figure 10.1 Hydrodynamic journal bearing geometry.
Figure 10.2 Unwrapped film shape in a journal bearing.
Fundamentals of Fluid Film LubricationHamrock, Schmid & JacobsonISBN No. 0-8247-5371-2
Sommerfeld Angle
Fundamentals of Fluid Film LubricationHamrock, Schmid & JacobsonISBN No. 0-8247-5371-2
Full Sommerfeld Solution
Figure 10.3 Pressure distribution for full Sommerfeld solution.
Sommerfeld substitution:
Pressure distribution:
Maximum pressure:
Fundamentals of Fluid Film LubricationHamrock, Schmid & JacobsonISBN No. 0-8247-5371-2
Forces for Sommerfeld Solution
Figure 10.4 Coordinate system and force components in a journal bearing.
Figure 10.5 Vector forces acting on a journal.
Fundamentals of Fluid Film LubricationHamrock, Schmid & JacobsonISBN No. 0-8247-5371-2
Reynolds Boundary Condition
Figure 10.6 Location of shaft center for full and half Sommerfeld journal bearing solutions.
Figure 10.7 Pressure profile for a journal bearing using Reynolds boundary condition.
Fundamentals of Fluid Film LubricationHamrock, Schmid & JacobsonISBN No. 0-8247-5371-2
Hydrodynamic Journal Bearings
Figure 11.1 Pressure distribution around a journal bearing.
Sommerfeld number:
Diameter-to-width ratio:
Fundamentals of Fluid Film LubricationHamrock, Schmid & JacobsonISBN No. 0-8247-5371-2
Film Thickness and Eccentricity
Figure 11.2 Effect of bearing number on minimum film thickness for four diameter-to-width ratios. [From Raimondi and Boyd (1958)].
Fundamentals of Fluid Film LubricationHamrock, Schmid & JacobsonISBN No. 0-8247-5371-2
Attitude Angle
Figure 11.3 Effect of bearing number on attitude angle for four diameter-to-width ratios. [From Raimondi and Boyd (1958).]
Fundamentals of Fluid Film LubricationHamrock, Schmid & JacobsonISBN No. 0-8247-5371-2
Friction Coefficient
Figure 11.4 Effect of bearing number on friction coefficient for four diameter-to-width ratios. [From Raimondi and Boyd (1958).]
Fundamentals of Fluid Film LubricationHamrock, Schmid & JacobsonISBN No. 0-8247-5371-2
Fluid Flow
Figure 11.6 Effect of bearing number on volume side flow ratio for four diameter-to-width ratios. [From Raimondi and Boyd (1958).]
Figure 11.5 Effect of bearing number on dimensionless flow rate for four diameter-to-width ratios. [From Raimondi and Boyd (1958).]
Fundamentals of Fluid Film LubricationHamrock, Schmid & JacobsonISBN No. 0-8247-5371-2
Maximum Pressure & Location
Figure 11.8 Effect of bearing number on location of terminating and maximum pressures for four diameter-to-width ratios. [From Raimondi and Boyd (1958).]
Figure 11.7 Effect of bearing number on dimensionless maximum film pressure for four diameter-to-width ratios. [From Raimondi and Boyd (1958).]
Fundamentals of Fluid Film LubricationHamrock, Schmid & JacobsonISBN No. 0-8247-5371-2
Effect of Radial Clearance
Figure 11.9 Effect of radial clearance on some performance parameters for a particular case.
Fundamentals of Fluid Film LubricationHamrock, Schmid & JacobsonISBN No. 0-8247-5371-2
Fixed-Incline Pad Journal Bearings
Fundamentals of Fluid Film LubricationHamrock, Schmid & JacobsonISBN No. 0-8247-5371-2
Effect of Preload
Figure 11.11 Effect of preload factor mp on two-lobe bearings. (a) Largest shaft that fits in bearing. (b) mp =0; largest shaft, ra; bearing clearance cb = c. (c) mp =1.0; largest shaft, rb; bearing clearance cb =0. [From Allaire and Flack (1980).]
Fundamentals of Fluid Film LubricationHamrock, Schmid & JacobsonISBN No. 0-8247-5371-2
Hydrodynamic Squeeze Film Bearings
Figure 12.2 Journal bearing with normal squeeze film action. Rotational velocities are all zero.
Figure 12.1 Parallel-surface squeeze film bearing.
Fundamentals of Fluid Film LubricationHamrock, Schmid & JacobsonISBN No. 0-8247-5371-2
Parallel Circular Plate
Figure 12.3 Parallel circular plate approaching a plane surface.
Load support:
Time of approach: