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  1. 1. Autonomous Hovercraft Design Team 17 December 2011 Engr100 Samuel Gbafa Akeem Shaw Chad Brown Team Leader Derek Dalbey Spencer Gibb Intro to Engineering Design
  2. 2. Design Overview <ul><li>Previously we had experimented with different deck materials, including wood and a Styrofoam deck that had dimensions that were later improved to make our current deck. </li></ul><ul><li>Our design is very similar to our original concept in that nearly everything that we modified was to achieve balance of the hovercraft. </li></ul>
  3. 3. Design Overview <ul><li>2 ft. x 3 ft. Styrofoam deck and plenum chamber </li></ul><ul><li>3 axial lift fans connected in parallel </li></ul><ul><li>Hovercraft propelled through a weight-shift system </li></ul><ul><li>Powered through a NiMH battery pack </li></ul>Current Design Properties:
  4. 4. Overall Status <ul><li>Team is on track to complete the project successfully and on time </li></ul><ul><li>Design finalized and just about implemented, we just need to finish the programming and weight shift system </li></ul><ul><li>Final Comprehensive Team Budget: $278.34 </li></ul>
  5. 5. Overall Status <ul><li>Gantt Chart </li></ul>
  6. 6. Introduction <ul><li>Throughout the semester we have managed to stay relatively on schedule, and got through all of the checkpoints without any major problems; but we do have to work on getting the hovercraft to reverse properly </li></ul><ul><li>Final design concept excluding the relocation of the NXT and Fuel Cell for balancing: </li></ul>
  7. 7. Status: Lift Subsystem <ul><li>Lifted by three 12V axial fans connected in parallel that run down the center of the hovercraft </li></ul><ul><li>Connected through a switch to the auxiliary power supply </li></ul><ul><ul><li>System requires 2.7 A at 12V </li></ul></ul><ul><ul><li>200 CFM required at 0.16 inch H 2 O </li></ul></ul><ul><ul><li>Target Gap Height of .15 inches </li></ul></ul>
  8. 8. Status: Battery System <ul><li>12V NiMH battery pack that comprises of 10 cells at 1.2V each </li></ul><ul><li>The pack has an ideal capacity of 3800 mAh </li></ul><ul><li>Each axial fan draws .9 A, so the lift system requires a total of 2.7 A at 12V </li></ul>
  9. 9. Status: Propulsion Technique <ul><li>Our propulsion technique consists of a 100 gram weight at the end of a 13 inch arm that rests nearly vertical at 85 degrees. </li></ul><ul><li>Upon the light sensor reading the turn-around zone, the NXT will tell the fuel cell to turn on a motor that will bring the arm up the last 5 degrees and let gravity do the rest and the weight will fall, changing the primary direction of air leakage, causing our hovercraft to reverse. </li></ul>
  10. 10. Key Issues <ul><li>Uncertainties </li></ul><ul><ul><li>Ability to get the hovercraft to reverse as it is designed to. </li></ul></ul><ul><ul><li>Balance </li></ul></ul><ul><ul><li>Successful Robolab program that will work with our design (have not tested it with our current design) </li></ul></ul><ul><li>Action Plan </li></ul><ul><ul><li>Adjust placement of components to get prepared for the final checkpoint </li></ul></ul><ul><ul><li>Discuss the Robolab program with other groups to figure out a solution that will work for us </li></ul></ul>
  11. 11. Future Plans <ul><li>Hovercraft almost complete: Everything working and in place except for our propulsion system </li></ul><ul><li>Currently working to implement the propulsion technique and create a successful Robolab program that will allow our hovercraft to reverse without any problems </li></ul><ul><li>If we had to do the project differently, we would have ordered the proper fans in the first place… </li></ul>