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Engr100pres2

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Engr100pres2

  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>

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