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AME 40463 Senior DesignGroup E3: Hewlett-Packers
Concept Design Review
April 24, 2008
Caitlin Feely
Ben Nelessen
JJ Rees
Jamie Rowland
Patrick Tennant
Project Description
Robo-Football Demonstration and Competition Development
Intercollegiate robotic “football” competition to encourage interest in science and engineering
Develop robot-based game with elements similar to American Football
Create rules of the game and quarterback prototype to demonstrate the feasibility and some fundamental features of the game
Product Design Requirements
Customers– University Engineering Departments and Students– Alumni Sponsors
Competition– Other Robo-Sport Competitions
• Robo Soccer• Robotic Football League (RFL)• College Competitions like Duke Annual Robo-Climb Competition
Product Design Requirements
Design Requirements– As similar to American Football as feasible with
robo-players• Scoring• Possession• Player Types
– Entertaining for everyone not just engineers
Options Considered
- Ability to move on grass/turf
- Indication of tackle/end of play - Use of compressed air as throwing mechanism
- Mobile base with rotating parts
- Pre-set plays- Embedded intelligence on side of robo-quarterback
- Larger scale for greater entertainment value.- Aspiration of full-scale American football - Touch sensor to indicate tackles
- Smaller robot for running backs
Rules of the Game
Players Each team will consist of 7 robo-players: 1 Quarterback, 1
Kicker, 2 Linemen, 3 Receivers/Defensive Backs All players have size restrictions
Playing Field The game is played on an indoor field 85 yards long by 50
yards wide with 8 yard end zones The field is surrounded by a barrier 1m high
Game Play The game is 5 on 5: Offense – Quarterback, 2 Linemen, 2
Receivers, Defense – 2 Linemen, 3 Defensive Backs Overtime will consist of a kicking competition
Limitations
Only one robot– Quarterback because we felt it would be the most
interesting while displaying more key features of the game
Size and Features– Could not buy adequate material to make the
larger robot originally planned– Inclusion of bumper and force sensors to indicate
a tackle or out of bounds– Remote control
Limitations
Refinement– Necessity of counterweight
• Better aesthetics
– Safety chain• Stronger material
– Vocal capabilities• Ability to announce play, indicate start of play, etc.
Key Technical Issues
Wheels– Number, Alignment, and Size– Coupler Design
- Our design point
Key Technical Issues – WheelsWheel Assembly
Wheel Coupler
Key Technical Issues
Air Cannon– Firing Mechanism
• Manual and electronic control
– Securing Cannon• Multiple HDPE supports to prevent lateral and backward
movement
Key Technical Issues - Air CannonAir Cannon Connection
Key Technical Issues
Cam Design and Support– Lifting the Platform
• Designed Oscillating Flat Faced Cam-Follower Mechanism
– Supporting Cam and Stepper Motor• Central PVC support with two HDPE supports to prevent
lateral movement
Key Technical IssuesCam-Follower Mechanism
Key Technical Issues
Automation and Controls– Integration of motors and necessary electronic
components to control them• Two drive motors controlled by H-bridges and one
stepper motor controlled by driver board
– Writing and refining code to run plays• Four preset plays and presets to demonstrate basic
movements
Key Technical IssuesAutomation and Controls
Circuit Diagram
Key Technical Issues
Safety– 70 psi maximum pressure– Hand pumping for better pressure control– Schrader valve
• Manual pressure release
– 90o maximum turns– 5 second delay before play starts– Safety chain– Softer ball– Machine Screws
Prototype Performance
Prototype Performance Requirements– Fits within rules developed– Demonstrates aspects of American Football– Includes embedded intelligence– Accuracy
• Accurate within desired ranges – 5 ft radius, 15 attempts• Dependent on
– Surface– Battery charge– Human error in filling air cannon pressure chamber
Final PrototypeCAD assembly of the Robot
Final PrototypeAir Cannon
Final PrototypeCompleted Prototype
Feasibility
Repeatability– Return to the line of scrimmage– Consistent distance for pressure
Entertainment Value– Appeals to engineers and non-engineers
Potential– Long-term intercollegiate program
Thank You
Questions?