Team ZeroTeam Zero

Natasha Hyare Ryan Benson Casey Carlin

Project OverviewProject Overview

• Introduction• Problem Criteria & Constraints• Preliminary Ideas• Refinement• Calculations• Implementation/Final Design• Results/Discussion• Conclusion• Suggested Improvements• Acknowledgements

IntroductionIntroduction

• Build an All-Terrain Vehicle that can complete the assigned course using only the materials provided.

• Use engineering concepts we learned, such as the design process and teamwork skills to complete our project.

Problem Criteria & Problem Criteria & ConstraintsConstraints

Constraints• Must

– Carry 3 golf balls– Complete the course

• Must Not– Use extraneous materials– Leave the course– Fall apart

Criteria• Balance

– Speed– Torque

• Minimize – Weight– Size

Preliminary IdeasPreliminary Ideas

• Cardboard box siding/frame

• Small profile and dimensions

• Reduce weight• 2 small CDs as front

wheels, 2 big CDs as rear wheels

Preliminary SketchesPreliminary Sketches

• Rubber band around wheels to increase traction

• 4 wheel drive to distribute motor power

• Rubber band ‘booster’ on front wheels

Project OverviewProject Overview

• Introduction• Problem Criteria & Constraints• Preliminary Ideas• Refinement• Calculations• Implementation/Final Design• Results/Discussion• Conclusion• Suggested Improvements• Acknowledgements

RefinementRefinement

• Minimize volume used to hold golf balls

• Make entire vehicle smaller

RefinementRefinement

• Use biggest gear as drive wheel

• Use two small CDs as rear wheels

RefinementRefinement

• Increased structural support• Repositioned motor, gears, and payload

with the elimination of the ramp

srad

revradrps

rpm

/1047

1/2*166

10000

Angular Speed Calculation

V= Voltage, w = angular velocity, P = Power, I = Current, T = Torque M = mass F = Force, v = velocity, r = radius of drive wheel, a = acceleration.

CalculationsCalculations

Power Calculation

V= Voltage, w = angular velocity, P = Power, I = Current, T = Torque M = mass F = Force, v = velocity, r = radius of drive wheel, a = acceleration.

CalculationsCalculations

W

vA

IVP

15

35

Torque Calculation

V= Voltage, w = angular velocity, P = Power, I = Current, T = Torque M = mass F = Force, v = velocity, r = radius of drive wheel, a = acceleration.

CalculationsCalculations

mN

sradWT

PT

0014.

/2.1047/15

Torque at 1:4 and 1:6 gear ratios

V= Voltage, w = angular velocity, P = Power, I = Current, T = Torque M = mass F = Force, v = velocity, r = radius of drive wheel, a = acceleration.

CalculationsCalculations

Nm

sradWT

Nm

sradWT

086.

/5.174/15

057.

/8.261/15

Velocity

V= Voltage, w = angular velocity, P = Power, I = Current, T = Torque M = mass F = Force, v = velocity, r = radius of drive wheel, a = acceleration.

CalculationsCalculations

sm

msradrv

/49.3

02.*/5.174max

Project OverviewProject Overview

• Introduction• Problem Criteria & Constraints• Preliminary Ideas• Refinement• Calculations• Implementation/ Final Design• Results/Discussion• Conclusion• Suggested Improvements• Acknowledgements

Implementation Implementation of Final Designof Final Design

Final DesignFinal Design

Final DesignFinal Design

Final DesignFinal Design

Final DesignFinal Design

Final DesignFinal Design

Results/DiscussionResults/Discussion

Distance in heat #1 (ft)

Distance in heat #2 (ft)

Performance Total

Rank (#/38)

5 ft 2 ft 4.5 36

Team Zero’s Performance in Competition:

(60 ft/smooth terrain) (60 ft/rough terrain)

Test Heat 1 Test Heat 2 Test Heat 3 Test Heat 4

9.2 seconds

8.9 seconds

12.7 seconds

13.1 seconds

Team Zero’s Performance in Testing:

Project OverviewProject Overview

• Introduction• Problem Criteria & Constraints• Preliminary Ideas• Refinement• Calculations• Implementation/Final Design• Results/Discussion• Conclusion• Suggested Improvements• Acknowledgements

ConclusionConclusion

Strengths• Small/lightweight• Sturdy• Fast• Innovative 3-wheel

design

Weaknesses• Wheel Alignment• Poor Wire Design

Suggested ImprovementsSuggested Improvements

• Problem #1- Car was scraping and got caught along the side wall

– Adding a bumper along the sides as well as the front of the vehicle

• Problem #2- The wires disconnected during the second trial

– The wires could have been permanently attached to each other

AcknowledgementsAcknowledgements

• DC Motor Torque/Speed Curve Tutorial http://lancet.mit.edu/motors/motors3.html

• Profs. Khoie, Saviz and Stark

Questions?Questions?