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Team 5 Vehicle Sizing PDR

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rodd
15 diapositives · 270 Views · Oct 13, 2014

Get insights into the new design adjustments, weight estimations, wing properties, coefficient estimations, and constraint diagrams created by AAE 451 Team 5. Explore the finalized numbers, issues with the given code, and future considerations.

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Team 5 Vehicle Sizing PDR
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  1. Team 5Vehicle Sizing PDR Presented By: Trent Lobdell Ross May Charles Stangle

  2. Outline • New Design Adjustments • Weight Estimations • Properties of the Wing • Coefficient Estimations • Resulting Constraint Diagram • Final Constraint Diagram • Specified Loading within Design Space • Final Numbers • Issues with given Code • Future Considerations AAE 451 – Team 5

  3. New Design Adjustments • Reasons • Rough initial design had CG too far aft • AC was not behind CG • Reasonable aspect ratio • Shapelier wing section • Design adjustments suggested by customer AAE 451 – Team 5

  4. Adjustments • Shortened booms • Decreased weight behind engine • Moved CG up • Pushed leading edge of wing back • Reduced wing area • Changed for better AR • AR Moved AC back and CG slightly forward AAE 451 – Team 5

  5. Further Adjustments • Smaller tail section • Again, moved CG farther forward • Maintains appealing stealth theme AAE 451 – Team 5

  6. Weight Estimation • Initial guess of 7.5 lbf from tables • Empty weight estimated at 6 lbf • Motor weight of 0.75 lbf • Energy density of batteries: 293040 joule/lbf • Guessed 3% battery weight fraction for take off and warm-up • Loiter time set at 30 min • Sizing code rendered a weight of: • 7.34 lbf AAE 451 – Team 5

  7. Properties of the Wing • Wing Area • Counted the 3x3 inch blocks on final diagram • S = 900 in2 • Aspect Ratio • b = 5 feet wing span • AR = b2/S = 4 AAE 451 – Team 5

  8. Coefficient Estimations • Drag Coefficients • 0.0025, 0.003, 0.0035 • Lift Coefficients • 1.0, 1.25, 1.5 • (CD1 with CL1) etc. AAE 451 – Team 5

  9. Resulting Constraint Diagram with Flexible Values Design Space: Power Loading W/Bhp Wing Loading W/S AAE 451 – Team 5

  10. Constraint Diagram With Moderate Values Design Space: CL = 1.25, CD = 0.003 AAE 451 – Team 5

  11. Workin’ in the Design Space Power Loading W/Bhp Wing Loading W/S AAE 451 – Team 5

  12. Known Vehicle Specifications • Weight = 7.34 lbf • Span = 60 in • AR = 4 • Wing Area = 900 in2 • Chosen Wing Loading = 0.165 lbf/in2 • Chosen Power Loading = 0.09 lbf/Bhp AAE 451 – Team 5

  13. Issues With Code • Poorly commented • Hard to follow due to excess code • Did not function with the three inputs that it seemed to require (CL and CD) • Hashes needed adjustment Neo hates it, and you. AAE 451 – Team 5

  14. Future Considerations • Implement energy consumption equations • Solidifying some of the numbers • Take off battery weight fraction • Warm-up battery weight fraction • Drag coefficient • Lift coefficient • L/D AAE 451 – Team 5

  15. Doubts? Thoughts? Things left unsaid? AAE 451 – Team 5