8/12/2019 ME308 061 HW4 Revised

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King Fahd University of Petroleum and MineralsCollege of Engineering

Department of Mechanical Engineering(06 !emester"

ME 308 Machine Design II Problem Set4

(Assigned: Saturday 25 November 2006 Due: Saturday 2 December 2006)________________________________________________________________________________

Note: Solutions submitted not following te !rescribed format would not be graded"

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# $ Design a plain surface bearing, using the boundar!lubricated approach, for the follo"ing three cases#$se an l#dratio for the bearing in the range of 0#%0 to %0# 'ompute the p( factor and specif asuitable material#

'ase )umber *adial +oad lb- Shaft Diameter in- Shaft Speed rpm- & ..% 3#00 &/%0 . 8%0 4#%0 .% 3 0 0#/% /%0

# $ % 1 full 2ournal bearing is 30 mm in diameter and %0 mm in length# he bearing load is .#/% ), andthe 2ournal rotates at &&.0 rpm# $se a radial clearance of 0#0.% mm, and find the minimum oil filmthicness, the friction coefficient, and the total oil flo" if the a5erage dnamic 5iscosit is 0 mPas#

# $ & S1E %0 oil at .%o' inlet temperature is used to lubricate a slee5e bearing &%0 mm in length and %0mm in diameter# he bearing load is 8 ), and the 2ournal speed is &0 rpm# $sing a clearance ratio

r6c of 00, find the temperature rise, the eccentricit ratio, and the ma7imum film pressure#

# $ # 1 . 7 . in slee5e bearing uses S1E .0 oil at an inlet temperature of &&0 o # he 2ournal speed is &&.0rpm, and the radial load is &.00 lb# 9ased on a radial clearance of 0#00. in, find:

a- he magnitude and location of the minimum oil!film thicnessb- he eccentricitc- he coefficient of frictiond- he po"er losse- 9oth the total and side oil flo"sf- he ma7imum oil!film pressure and its angular locationg- he terminating position of the oil filmh- he a5erage temperature of the side flo"

i- he oil temperature at the terminating position of the oil film#

# $ ' Sol5e problem 4!&0 of our te7tboo#

# $ 6 1 %0 mm diameter bearing is %% mm long and has a central annular oil groo5e % mm "ide "hich is

fed b S1E 30 oil at %%o' and .00 Pa suppl pressure# he radial clearance is 4. m# he 2ournal

speed is 48 rps corresponding to a bearing load of &0 )# ind the temperature rise of the lubricant,the total oil flo", and the minimum film thicness#

# $ 1 full bearing supports a shaft running at &800 rpm and carring a load of &8%/0 )# Shaft diameter is&./ mm, and bearing length is 3#% mm# S1E .0 oil is used at an a5erage film temperature of ;0o'#or a radial clearance of 0#03% mm, determine the minimum oil film thicness, the po"er loss, and the

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