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Unformatted text preview: budynas_SM_ch17.qxd 12/06/2006 17:29 Page 439 FIRST PAGES 439 Chapter 17 (b) The fully developed friction torque on the ﬂywheel using the ﬂats of the V-belts is
Tﬂat = Fi 1.637 − 1
exp( f θ ) − 1
exp( f θ ) + 1
1.637 + 1 = 1371 lbf · in per belt The ﬂywheel torque should be
Tﬂy = m G Ta = 5.147(586.9) = 3021 lbf · in per belt
but it is not. There are applications, however, in which it will work. For example,
make the ﬂywheel controlling. Yes. Ans.
(a) S is the spliced-in string segment length
De is the equatorial diameter
D is the spliced string diameter S De δ is the radial clearance
S + π De = π D = π ( De + 2δ ) = π De + 2πδ D From which
2π The radial clearance is thus independent of De .
= 11.5 in
2π Ans . This is true whether the sphere is the earth, the moon or a marble. Thinking in terms
of a radial or diametral increment removes the basic size from the problem. Viewpoint
(b) and (c) Dp 60" dp Pitch surface Table 17-9: For an E210 belt, the thickness is 1 in.
1" 0.716" 210 + 4.5 210
= 0.716 in
2π d P − di = ...
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This note was uploaded on 12/13/2011 for the course EML 3013 taught by Professor Shingley during the Fall '11 term at UNF.
- Fall '11