Energy Analysis
The second aR&D our team worked on was Energy Analysis. The purpose of this aR&D was to calculate propeller and friction forces using samples of AEV data. The data collected allowed us to make comparisons between the different designs in class and help us improve our design. Our AEV weighs .303 kg with our 3D printed frame. In the first task, our AEV traveled 109.38 inches, which is equal to 2.78 meters or 227.0 marks. In the third task, our motors stopped after 4 seconds and our AEV stopped after 4.08 seconds. Our motor stopped after 114.0 marks (1.395 m) while our AEV stopped after 221.0 marks (2.705 m).
The AEV wheel count sensors measured the distance the AEV traveled at .4875 inches per mark. The initial Marks error was 6 marks. To reduce this error we made sure the sensors were connected and used a meter stick to make our measurements more precise. Our team concluded our AEV’s friction force as 2.642 N and propeller force to be 2.695 N using the equations provided.
v(avg) = x1/t1 = 0.349 m/s
v1 = 2*v(avg) = 0.698 m/s
a(c) = v1/(t2-t1) = 8.720 m/s^2
a(p) = v1/t1 = 0.174 m/s^2
F(friction) = m * a(c) = 2.642 N = 269.4 gram-force
F(net) = m * a(p) = 0.053 N = 5.400 gram-force
F(propeller) = F(net) + F(friction) = 2.695 N = 274.8 gram-force