2. Robotics Intensive: Day 5 Gui Cavalcanti 1/17/2012

3. Class Goals 1.The “Science” of Making Decisions 2.Review task worksheets 3.Work on design

4. Decision Matrices

5. A tool used to attempt to quantify a major design decision with no easy answer and lots of pertinent details to weigh Attempt to give many design options equal chances, however vocal individual proponents may be

6. Decision Matrices LocomotionWheelsTracksLegs Financial Cost321 Engineering Time321 Skill Required321 Badassery345 Total:12108

7. Decision Matrices LocomotionWeightingWheelsTracksLegs Financial Cost33 (9)2 (6)1 (3) Engineering Time 33 (9)2 (6)1 (3) Skill Required33 (9)2 (6)1 (3) Badassery23 (6)4 (8)5 (10) Total:12 (33)10 (26)8 (19)

8. Drawbacks Sometimes easily manipulated Only as accurate as your expectations Designs must all be equally developed

9. Today’s Tasks

10. Conceptual Design Conceptual design: what are the big ideas? What can we set in stone? By the start of next class, each team must have the following done: – Mission profiles – Expected robot dimensions and weight Gross component placement – All major components selected Mechanical, electrical, sensors

11. Mission Profile What: Representative average description of everything the robot does between ‘off’ periods Why: To lay the groundwork for generating power system requirements How: Ask yourself questions – What will the robot do between charges? – How long will these actions take? – What could go wrong to delay the robot?

12. Mission Profile – Vending Machine 1.Drive full circle around the space with no customers (30 min) 2.Pause, keep vending (2.5 hrs) 3.Drive around space, stop halfway (15 min) 4.Wait for 3 customers (10 min) 5.Keep driving (10 min) 6.Encounter obstacle, pause (5 min) 7.Go back home the long way (15 min) 8.Pause, keep vending (2.5 hrs)

13. Task Worksheets