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HOMEWORK #1 RBE 2001

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HOMEWORK #1
RBE 2001 A20 Due: September 7, 2020 Page 1
If you simply write down an answer, your grade on a problem is an all or nothing proposition. Always
show your work if you want the possibility of partial credit. This homework is scored out of 50 points.
1. (12 pts. each) For each mechanism, find the mobility and determine the Grashof condition.
1
2
3
4
162
77
73
135
L
L
L
L
=
=
=
=
1 2
3 4
155 31
95 103
L L
L L
= =
= =
HOMEWORK #1
RBE 2001 A20 Due: September 7, 2020 Page 2
2.(26 pts. total) Your boss gives you the following partially-specified fourbar mechanism to finish
and tells you only that it must be Grashof. She then leaves to go to a major industry trade show.
When she calls you the next day to ask for the length of link d – what do you tell her? [Hint:
think the problem through carefully; there is more than one possible answer. Show all ranges of
d for which the mechanism will be Grashof. Combine ranges if possible, in order to get full
credit.]
:159 mm
: 350 mm
: 462 mm
: ?
a
b
c
d
Figure courtesy of COMPMECH Research Group

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