solid work

ME 134 – Kinematics of Machinery

Exam #1 (Friday, 09/22/17) (open anything, no discussion)

NOTE:

- Label all graphs, files and folders correctly and descriptively. For example folder “Problem 1”, graph “VBslip”.

- Write legibly and in an organized order to receive the most credit.

1) (25 points) (On paper) Calculate the mobility of the system in the picture on the right. a) (5 pts) L = ? b) (5 pts) J1 = ? c) (5 pts) J2 = ? d) (5 pts) M = ? e) (5 pts) How many actuators would you use? Indicate on the picture the links (or joints) you would install actuators. What type of actuators would you use (rotary or linear)?

2) (25 points) (On paper) Calculate the mobility of the system in the picture on the left. a) (5 pts) L = ? b) (5 pts) J1 = ? c) (5 pts) J2 = ? d) (5 pts) M = ? e) (5 pts) How many actuators would you use? Indicate on the picture the links (or joints) you would install actuators. What type of actuators would you use (rotary or linear)?

3) (70 points) Two position synthesis with provided fixed O2 and O4. E1 and E2 are at the same level. F1 and F2 are at the same level. Units in inches.

Paper portion: (40 points) a) (15 pts) Design a fourbar linkage to move its coupler through the two positions shown above using provided ground pivot points O2 and O4. O2 and O4 are horizontally aligned.

(10 pts) Correct approach (5 pts) What is Grashof condition of the fourbar linkage (which case)?

c) (20 pts) Add a driver dyad to limit its motion to the range of positions shown. Driver of the dyad is rotating CCW. - (5 pts) Non-quick-return - (5 pts) The pivot point O6 is not more than 8 inches away from point O2 - (5 pts) The minimum transmission angle is no less than 45o - (5 pts) Show calculations of links 5 and 6 SolidWorks portion: (30 points) a) (10 pts) SolidWorks sketch. b) (10 pts) Parts c) (5 pts) Assembly d) (5 pts) In a Motion study, the driver dyad runs at 150RPM CCW (from front view).

4) (80 points) Three position synthesis with arbitrary O2 and O4. The numbers in parentheses are the coordinates of the point. Unit in centimeters.

Paper portion: (40 points) a) (15 pts) Design a fourbar linkage to move its coupler through the three positions shown above using points A and B for attachment. AB = 4.5 cm.

(10 pts) Correct approach (5 pts) What is Grashof condition of the fourbar linkage (which case)?

b) (25 pts) Add a driver dyad to limit its motion to the range of positions shown. Driver of the dyad is rotating CCW.

(5 pts) Quick-return with time ratio 1/1.4 (5 pts) The pivot point O6 is at the origin (10 pts) Show calculation of links 5 and 6 (5 pts) What is the minimum transmission angle of the driver dyad?

SolidWorks portion: (40 points) a) (10 pts) SolidWorks sketch. b) (15 pts) Parts c) (5 pts) Assembly d) (5 pts) In a Motion study, the driver dyad runs at 120RPM CCW (from front view). e) (5 pts) Plot linear acceleration (both X and Y directions in one graph) of point A with respect to time for two complete revolutions of the driver dyad. Export to Excel and annotate the graph appropriately. The graph has to be smooth.