adapted from theory of machine and mechanisms j.e shigley
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Adapted From theory of machine and mechanisms
J.E Shigley
4. Position Analysis
Qassim University
Unayzah College of Engineering
Mechanical Engineering Dept.
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Translation, Rotation, and Complex motion
Translation: keeps the same angle
Rotation: one point does not move
Complex motion: a combination of rotation and
translation
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Graphical Position Analysis of Linkages
Given the length of the links (a,b,c,d), the ground position, and q2. Find q3 and q4
a
d q2
b
c
q3
q4
A
B
O2 O4
b
c
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Graphical Linkage Analysis Draw an arc of radius b,
centered at A
Draw an arc of radius c, centered at O4
The intersections are the two possible positions for the linkage, open and crossed
a
d q2
b
c
q3
q4
b
c
A
O2 O4
B1
B2
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Algebraic Position Analysis
2
2
sin
cos
q
q
aA
aA
y
x
Obtain coordinates of point A:
222
222
yx
yyxx
BdBc
ABABb
Obtain coordinates of point B:
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