As in Example 16-1 Symbol English MetricRadial Load F lb NDiameter min in mmRotational Speed n rpm rpmTrial Diameter D in mmRatio of Bearing Length to Dia. L/D 1 in/in 1 mm/mmLength L 0 in 0 inPressure p #DIV/0! psi #DIV/0! mPaJournal Speed V 0 ft/min 0 m/spV Factor pV #DIV/0! psi-fpm #DIV/0! mPa*m/sDesign Value pV #DIV/0! psi-fpm #DIV/0! mPa*m/s

As in Example 16-3 Symbol English MetricRadial Load F lb NRotational Speed n rpm rpmDiameter min in mmTrial Diameter D in mmPressure p 200 psi 1.4 mPaLength L #DIV/0! in #DIV/0! inDimametral Clearance in m^-9Radial Clearance 0 in 0 m^-9Ratio of radius to Radial Clearance #DIV/0! in/in #DIV/0! mm/umRatio of Bearing Length to Dia. L/D 1 in/in 1 mm/mmSurface Finish 16 in^-9 0.4 m^-9Min Film Thickness 0 in 0 mmFilm thickness ratio #DIV/0! in/in #DIV/0! mm/umSommerfeld Ratio S

Dmin

pVd

Dmin

Cd

Cr

R/Cr

ho

ho/Cr

Rotational Speed/s 0 rps 0 rpsviscocity mew #DIV/0! #DIV/0!max lubricant temp 160 F 70 CCoefficient of Friction Variable f(R/Cr)Coefficient of Friction f #DIV/0! #DIV/0!Friction Torque #DIV/0! lbin #DIV/0! NmPower disipated #DIV/0! hp #DIV/0! mPa*m/s

ns

Tmax

Tf

Pf

notesGiven pg 687 pdfGiven Given Usually start with Dmin(0.5 to 2.0) For Non-lubricated (dry rubbing) or oil-impregnated porous bearings L/D= 1D(L/D)F/LD

notesGiven Given Given

Spec a nominal operating bearing ressure 200-500 psi (1.4-3.4 Mpa)L=F/pDUse Fig 16-3 to spec

(0.5 to 2.0) For Non-lubricated (dry rubbing) or oil-impregnated porous bearings L/D= 116to 32(.4 to .8 metric) (8 to 16 in high precision)

use with chart 16-7 input S below

piDn/12(60000 metric)

Pick material from table 16-1, then a dimetral clearance Cd from figure 16-3

Specify a trial journal diameter (Dmin or bigger)

16-8 belowSelect a lube from 16-6,( if mew higher recompute S, 16.7 for new ho)

Pick from table 16-1, then a dimetral clearance Cd from figure 16-3