MCE 260 Fall 2015
Homework 2, due September 8, 2015.
PRESENT CLEARLY HOW YOU DEVELOPED THE SOLUTION TO THE PROBLEMS
Each problem is worth up to 5 points. Points are given as follows:
5 points: Work was complete and presented clearly, the answer is correct
4 points: Work was complete, but not clearly presented or some errors in calculation
3 points: Some errors or omissions in methods or presentation
2 points: Major errors or omissions in methods or presentation
1 point: Problem was understood but incorrect approach was used
12:00
Figure 1
[(7)=-1
1020
50 60 Torque 7 (ce-in)
1. The diagram above shows the torque-speed relationship for a X hp shunt-wound DC motor with a rated speed N = 0000 RPM. Determine the unloaded speed, stall torque, and rated torque. From the equations provided, determine the maximum power that the motor can deliver, in Watts, and compare this to the rated power of X hp.
NOTE 1: For graphical linkage synthesis, I highly recommend using different colors for the different positions of the linkage, similar to what I did in class with white and yellow. That way you can actually see the linkage in the two (or three) positions.
NOTE 2: If the problem has no solution, or a solution that is not practical, please discuss what happens, why, and how you might fix it.
2. and back, using a constant speed crank rotation as input. Use a graphical method. Indicate the transmission angles in the diagram for both extreme positions of the rocker.
3. Use Figure 2 on the next page. Design a linkage to move the box from position 1 to position 3, using a graphical method and rocker output for the two-position synthesis. Disregard position 2.
4. Use Figure 2 on the next page. Design a linkage to move the box from position 1 to position 3, using a graphical method and coupler output for the two-position synthesis. Disregard position 2.
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