Calculations

Figure 1. Mission 1a with four 80 degree turns

Figure 2. Mission 1a with four 85 degree turns

Figure 3. Mission 1a with the ideal four 90 degree turns

Figure 4. Mission 1a with four 95 degree turns

Referring to Figures 1-4, in order to complete mission 1a, (refer to the Missions tab from the home page for details) the rover needs to complete four 90 degree turns with a plus or minus five degree error so that it may finish within a 3 foot radius from where it started.

Figure 5. Mission 1b with a 20 foot target

Figure 6. Mission 1b with a 25 foot target

Referring to Figures 5 and 6, in order to complete mission 1b, (refer to the Missions tab from the home page for details) the rover must not drift laterally by more than about 25 degrees in order to finish within plus or minus 10% of the target distance. Our team will provide a safety factor of 5 degrees for testing so that by aiming for no more than 20% lateral drift, we can be sure to complete the mission.

Figure 7. SOLIDWORKS simulation displaying the vertical displacement for the aluminum chassis experiencing a load of 5lbf

Figure 8. SOLIDWORKS simulation displaying the vertical stress for the aluminum chassis experiencing a load of 5lbf

Figure 9. SOLIDWORKS simulation displaying the vertical displacement for the ABS chassis experiencing a load of 5lbf

Figure 10. SOLIDWORKS simulation displaying the vertical stress for the ABS chassis experiencing a load of 5lbf

Figure 11. Table comparing the SOLIDWORKS simulations for both Aluminum and ABS materials

Referring to Figures 7-11, there are insignificant differences between the stress and displacement for the aluminum and the ABS chassis. Our team has decided that the only reason we would use an ABS chassis is if we are struggling to meet the weight requirement of 4 lbs. This is because the ABS chassis is about 1/3 of the weight of the aluminum chassis.