Natasha Hyare Ryan Benson Casey Carlin Team Zero Natasha Hyare Ryan Benson Casey Carlin

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

Introduction 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 & 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 Ideas Cardboard box siding/frame Small profile and dimensions Reduce weight 2 small CDs as front wheels, 2 big CDs as rear wheels

Preliminary Sketches Rubber band around wheels to increase traction 4 wheel drive to distribute motor power Rubber band ‘booster’ on front wheels

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

Refinement Minimize volume used to hold golf balls Make entire vehicle smaller

Refinement Use biggest gear as drive wheel Use two small CDs as rear wheels 40 20 30 10

Refinement Increased structural support Repositioned motor, gears, and payload with the elimination of the ramp

Calculations 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.

Calculations 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.

Calculations 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.

Calculations 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.

Calculations 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.

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

Implementation of Final Design

Final Design

Final Design

Final Design

Final Design

Final Design

Results/Discussion 9.2 seconds 8.9 seconds 12.7 seconds 13.1 seconds Team Zero’s Performance in Competition: 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 Testing: (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

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

Conclusion Strengths Small/lightweight Sturdy Fast Innovative 3-wheel design Weaknesses Wheel Alignment Poor Wire Design

Suggested 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

Acknowledgements DC Motor Torque/Speed Curve Tutorial http://lancet.mit.edu/motors/motors3.html Profs. Khoie, Saviz and Stark

Questions?