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Unformatted text preview: ME3212: Mechanisms Exam 1 : Fall 2007
Name 1. (20 pts) Calculate the number of degrees of freedom for each of the following mechanisms.
) Number the links on each mechanism and indicate the degrees of freedom of each joint with a “(1)”
or “(2).,, Q
§_. Page 1 of4 ME3212: Mechanisms Exam 1: Fall 2007
Name 2. (25 pts) Consider the mechanism with the conﬁguration shown below and the given dimensions. a1=35mm
a2=25mm
a3=10mm
a4=40mm
a5=45mm
(1) = 30deg 02 = 100 deg 03 = 13.4 deg 04 = 140.8 deg 032 = 20 rad/s ccw
(03 = 41.12 rad/s cw
(04 = 15.7 rad/s ccw a) Determine whether or not link 02A can make a complete revolution with respect to the other
links. b)What kind of mechanisms is this? double rocker, double crank, crankrocker c) Write down expressions for the x and y positions of point P in the xy system shown above. (1) Write expressions for the x and y components of velocity of point P. e) Determine the magnitude and direction of the velocity vector of point P. Page 2 of4 ME3212: Mechanisms Exam 1: Fall 2007
Name 3. (30 pts) Consider the multiloop mechanism shown below. a) Write the loop closure equations. b) Identify the unknown variables and the number of degrees of freedom. 0) Can link 02A or link 04B make a complete revolution with respect to the other links? d) What is the maximum value of r? (Hint: this happens in a dead—center conﬁguration) e) What is the value of 62 when r = 45 inches? i) What is the value of 64 when r = 45 inches? Page 3 of4 ME3212: Mechanisms Exam 1: Fall 2007
Name 4. (20 pts) Determine the angle 62 to the nearest 0.5 degree of the slider crank 1n the position
sketched (not to scale) below Page 4 of4 ...
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 Fall '09
 JeremyS.Daily

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