Structures and Weights Preliminary Design Review Phoenix Aerospace – Structures Team Jamie Allen Andy Wiratama 11/18/2018 Phoenix Aerospace AAE 451 – Fall 2001
Objectives Material Properties V-n Diagram Wing Loading Analysis Weight Breakdown CG Locations Wing Layout Analysis and Testing Landing Gear 11/18/2018 Phoenix Aerospace AAE 451 – Fall 2001
Material Properties *note properties are approximate values for average materials, and most are not true constants 11/18/2018 Phoenix Aerospace AAE 451 – Fall 2001
V-n Diagram 11/18/2018 Phoenix Aerospace AAE 451 – Fall 2001
Wing Loading Analysis MATLAB Code is used to determine: Wing loading using Schrenk’s approximation (Raymer) Trapezoidal Approximation Elliptical Approximation Shear force Moment Centroids 11/18/2018 Phoenix Aerospace AAE 451 – Fall 2001
Wing Loading Analysis Front Wing Loading Rear Wing Loading 11/18/2018 Phoenix Aerospace AAE 451 – Fall 2001
Wing Loading Analysis Front Wing Shear Force Rear Wing Shear Force Shear Force decreases as it moves away from the root to the tip 11/18/2018 Phoenix Aerospace AAE 451 – Fall 2001
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 11/18/2018 Phoenix Aerospace AAE 451 – Fall 2001
Weight Breakdown 11/18/2018 Phoenix Aerospace AAE 451 – Fall 2001
CG Locations X measured from nose to tail (roll axis) CG x=31.37 in. y=0 z=3.32 in. 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) Simplifying Assumptions: Symmetric Rectangular sections using root chord Wings as flat plates 11/18/2018 Phoenix Aerospace AAE 451 – Fall 2001
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 11/18/2018 Phoenix Aerospace AAE 451 – Fall 2001
Analysis and Testing Fuselage design Wing layout (program for spar sizing) Wing deflection calculations ViSTA analysis Construct scaled-down wing Sandbag loading test 11/18/2018 Phoenix Aerospace AAE 451 – Fall 2001
Landing Gear Taildragger configuration Buy pre-designed gear Tip-over analysis Sizing for gear (trade study) *diagram from Raymer 11/18/2018 Phoenix Aerospace AAE 451 – Fall 2001