* All information regarding these tests can be found in the Lab Manual Preliminary Research and Design.
The purpose of this section is to showcase the team’s learning experience and initial testing of the sample AEV. Below includes a test that showcases the sample’s power input over time and distance as well as the initial test of the AEV’s reflectance sensors.
Motor Testing
By observing the graph and code one can see how the AEV’s power was supplied over time. For the first 3 seconds, the AEV was given a code to accelerate from 0% power to 25% and then run at 25% for 1 second. Then from 4 to 6 seconds, the AEV lowered its power to 20% power. Lastly the code had the AEV reverse and go back up to 25% power for 2 seconds more before cutting all power to the vehicle.
By using the graph and comparing it to the code one can see how the two correlate. In the first .04 meters the AEV runs at 25% power. Then for the next .08 meters the AEV runs at 20% power. The AEV increases power briefly before coming to a short standstill while it reverses and then slowing down and finally stopping.
For this test we used the small blade propellers, because of this the AEV did not travel far and the graphs were not as clear as they could have been. In future tests, we will use the larger blades to avoid this problem.
Reflectance Sensors
The function of the sensors is to measure the number of points the wheel turns which allows for measurement of distance. There are 8 points per revolution and each point is 0.4875 in. These sensors are important because they allow the vehicle to be programmed to stop at the proper gates and loading docks.
A partially built sample AEV with reflectance sensors.
The commands used in this lab may limit the success of the AEV because the brake command cuts off power, it does not stop right away.