MEE474 Chapter 12
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Science, Mathematics, Physics
•
University
•
Hard
Professor Tomforde
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4 Slides • 6 Questions
1
MEE474 Chapter 12
By Professor Tomforde
2
Multiple Choice
The symbol for minimum film thickness
h0
tmin
tfilm
fthicc
3
This is a dimensionless variable, the ratio of film thickness to minimum clearance.
--ProTip: Don't forget to multiply this value by c to get h0!
Fig 12-15
4
Multiple Choice
The bearing characteristic number, or S, is also called the
Sommerfeld number
Reynolds number
viscosity
coefficient of friction
5
Fill in the Blanks
Type answer...
6
The y-axis gives you the flow ratio, or Qs/Q.
This is a percentage value.
Fig 12-19
7
Multiple Choice
The minimum clearance for a bushing bore of 25.03 mm and a journal diameter of 25 mm
0.015 mm
0.03 mm
-0.03 mm
0
8
Careful!
The clearance value is a radius so don't forget to divide the diameter difference by 2.
Tip: This should be the minimum number possible, so the difference between minimum bushing and the maximum diameter.
9
Draw
Identify on the graph: Sommerfeld number of 0.2 and l/d =0.5.
10
Open Ended
Why do we care about the torque value when we look at engine specs?
MEE474 Chapter 12
By Professor Tomforde
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