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Unformatted text preview: Engineering Mechanics - Dynamics vD = ωAB rCID Chapter 16 vD ωCD = r'DIC vC = ωCD r'CIC vC = 2.93 ft
s Problem 16-103
The crankshaft AB rotates with angular velocity ωAB about the fixed axis through point A, and
the disk at C is held fixed in its support at E . Determine the angular velocity of rod CD at the
instant shown where CD is perpendicular to BF.
r1 = 100 mm
r2 = 300 mm
r3 = 75 mm θ = 60 deg
ωAB = 50 rad
s r4 = 75 mm
r5 = 40 mm
rBIC = r2 cos ( θ ) rFIC = r2 tan ( θ ) vB = ωAB r1 ωBF = vB
rBIC vF = ωBF rFIC rBIC = 0.60 m rFIC = 0.5196 m vB = 5.00 m
s ωBF = 8.33 rad
s vF = 4.330 m
s ωCD = 57.7 rad
s Thus, ωCD = vF
r3 *Problem 16-104
The mechanism shown is used in a riveting machine. It consists of a driving piston A , three
members, and a riveter which is attached to the slider block D. Determine the velocity of D at
the instant shown, when the piston at A is traveling at vA.
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- Spring '08