Misc

Concept Screening

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Success Criteria Reference DL DO DS DD
Balanced 0 + 0 0 +
Minimal blockage 0 0 + + +
Center-of-gravity 0 + 0 – 0
Maintenance 0 0 0 0 –
Durability 0 0 0 0 0
Cost 0 – – + –
Environmental 0 0 0 0 0
# + 0 2 1 2 2
# 0 7 4 5 4 3
# – 0 1 1 1 2
Net score 0 +1 0 +1 0
Continue? COMBINE NO COMBINE NO

Concept Scoring

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Concept Scoring Matrix Reference Team Lauren Olivia Sam Derek
Success Criteria Score Rate Score Rate Score Rate Score Rate Score Rate Score Rate
Balanced- 20% .6 3 1 5 .8 4 .6 3 .6 3 .6 3
Minimal blockage- 15% .45 3 .45 3 .45 3 .3 2 .45 3 .45 3
Center-of-gravity location- 10% .2 2 .4 4 .4 4 .3 3 .2 2 .2 2
Maintenance- 10% .5 5 .5 5 .5 5 .5 5 .5 5 .5 5
Durability- 15% .75 5 .75 5 .75 5 .75 5 .75 5 .75 5
Cost- 20% .6 3 .6 3 .8 4 .8 4 .8 4 .8 4
Environmental- 10% .3 3 .3 3 .3 3 .3 3 .2 2 .3 3
Total Score 3.4 24 4.0 28 4.0 28 3.55 25 3.5 24 3.6 25
Continue? NO YES REVISE NO NO NO

Week 2 Additional Requirements

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The propellers, starting from rest and accelerating over a period of a few seconds, experienced a very small bit of lag due to the fact that the motor was attempting to rotate them at very low speeds at the beginning of the command. This is similar to the propellers in the wind turbine lab, which only began to move when the power output reached a certain value.

The only commands that presents a few limitations as of now is the “brake(m);” command, which does not fully brake the AEV to a complete stop. Since there is not an overall brake command that instantaneously brakes the AEV, in order to get the AEV to stop when it should the “reverse(m);” command will have to be manipulated or the brake command will have to be initiated with enough time for the AEV to coast to a stop at a desired point.

One error that was made early in scenario 1 was the use of the “goFor(t);” command. The command must be placed directly after each individual brake, celeration, reverse and motor speed command in order to apply to that command. If placed after a strand of commands, the “goFor(t);” command will only apply itself to the one command directly prior. Scenario 2 was not able to have been completed due to time restraints.

Other than questions about the commands, which were answered during testing, there were no issues with lab material. Testing the commands without previously knowing their specific limitations proved more useful than simply being told their restrictions beforehand.