1. Motor
ME114
Fall 2007
Noe Garcia

2. The Problem Problem 19.169 A 400-kg motor supported by four springs,
each of constant 150 kN/m, and a dashpot of
constant c = 6500 N-s/m, is constrained to
move vertically. Knowing that the unbalance
of the rotor is equivalent to a 23-g mass
located at a distance of 100 mm from the
axis of rotation, determine for a speed
of 800 rpm (a) the amplitude
of the fluctuating force transmitted to
the foundation,
(b) the amplitude of the
vertical motion of the
motor.

3. Initial Creation Process
* Inserting Correct UNITS

4. Continued Process
Inserting Grid Lines

5. Continued Process Use the Polygon tab to create this figure
Also use the anchor so the block will not fall due to gravity

6. Continued…
Use the circle tabs and
Square tab to finish drawing

7. Continued…
Insert the springs with the specified spring constants. Also insert the damper

8. Continued…….
* Insert a keyed slot joint so your motor can only move in the vertical direction

9. Continued………..
Now insert a 23g mass 100 mm from center radius of large circle as seen in picture.
The large circle is the motor double click it to set up velocity and mass.
You can do this to every object on your grid.

10. Continued……..
Now that the drawing is complete and all units correct, you can select the object
you want measure (in this instance the spring) and click the Measure
button on top. Now click the tab you want here I choose velocity of spring.

11. Simulation * When the Run Button was pressed the simulation started.
* Press stop to stop simulation.

12. Simulation calc. and results
Part a) I measured the amplitude Force (Fm) to be 5.89N

13. Simulation Calc. and Results
Part b) Xm= 4.6*10^-5 m based on the simulation. The actual answer was
Xm= 7.10 *10^-6
****Im not sure what happened that the values were not close!

14. The End
Credits