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Structures and Weights Preliminary Design Review

Structures and Weights Preliminary Design Review. Phoenix Aerospace – Structures Team Jamie Allen Andy Wiratama. Objectives. Material Properties V-n Diagram Wing Loading Analysis Weight Breakdown CG Locations Wing Layout Analysis and Testing Landing Gear. Material Properties.

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Structures and Weights Preliminary Design Review

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  1. Structures and Weights Preliminary Design Review Phoenix Aerospace – Structures Team Jamie Allen Andy Wiratama Phoenix Aerospace AAE 451 – Fall 2001

  2. Objectives • Material Properties • V-n Diagram • Wing Loading Analysis • Weight Breakdown • CG Locations • Wing Layout • Analysis and Testing • Landing Gear Phoenix Aerospace AAE 451 – Fall 2001

  3. Material Properties • *note properties are approximate values for average materials, and most are not true constants Phoenix Aerospace AAE 451 – Fall 2001

  4. V-n Diagram Phoenix Aerospace AAE 451 – Fall 2001

  5. Wing Loading Analysis • MATLAB Code is used to determine: • Wing loading using Schrenk’s approximation (Raymer) • Trapezoidal Approximation • Elliptical Approximation • Shear force • Moment • Centroids Phoenix Aerospace AAE 451 – Fall 2001

  6. Wing Loading Analysis • Front Wing Loading Rear Wing Loading Phoenix Aerospace AAE 451 – Fall 2001

  7. Wing Loading Analysis • Front Wing Shear Force Rear Wing Shear Force • Shear Force decreases as it moves away from the root to the tip Phoenix Aerospace AAE 451 – Fall 2001

  8. Wing Loading Analysis • Front Wing Moment Rear Wing Moment • Moment about the longitudinal direction • Small wing load distribution at tip leads to small moment at the tip Phoenix Aerospace AAE 451 – Fall 2001

  9. Weight Breakdown Phoenix Aerospace AAE 451 – Fall 2001

  10. CG Locations X measured from nose to tail (roll axis) Y measured spanwise from center of fuselage (pitch axis) Z measured vertically from bottom of fuselage (yaw axis) CG x=31.37 in. y=0 z=3.32 in. • Simplifying Assumptions: • Symmetric • Rectangular sections using root chord • Wings as flat plates Phoenix Aerospace AAE 451 – Fall 2001

  11. Wing Layout • Shaped using foam • Rectangular spars (caps) located around quarter-chord • Spar towards trailing edge to support control surfaces • Monokote used to strengthen and smooth surface • Depending on testing, may add stringers or other strengtheners Phoenix Aerospace AAE 451 – Fall 2001

  12. Analysis and Testing • Fuselage design • Wing layout (program for spar sizing) • Wing deflection calculations • ViSTA analysis • Construct scaled-down wing • Sandbag loading test Phoenix Aerospace AAE 451 – Fall 2001

  13. Landing Gear • Taildragger configuration • Buy pre-designed gear • Tip-over analysis • Sizing for gear (trade study) • *diagram from Raymer Phoenix Aerospace AAE 451 – Fall 2001

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