Structures PDR #2 AAE451 – Team 3 December 2, 2003

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Presentation transcript:

Structures PDR #2 AAE451 – Team 3 December 2, 2003 Brian Chesko Brian Hronchek Ted Light Doug Mousseau Brent Robbins Emil Tchilian

Introduction Walk Around Landing Gear Placement Landing Gear Design Landing Gear Analysis Updated Weight Assessment

Aircraft Walk Around Wing Span = 14.4 ft Wing Chord = 2.9 ft A/C Length = 10 ft T-Tail – NACA 0012 Pusher Internal Pod Tricycle Gear Low wing – Clark Y

Landing Gear Placement (I) θ = tipback angle = Landing gear placement based on guidelines found in Raymer

Landing Gear Placement (II) γ = overturn angle = Landing gear placement based on guidelines found in Raymer

Landing Gear Design Safe and Strong Easy to Construct Aluminum for structure Rubber bungee to absorb energy Do not break airplane if gear fails Easy to Construct Weldable (the aluminum, not the bungee) Easily Obtainable

Rear Gear Design

Easily Obtainable Square Tubing Ref. www.mcmaster.com

Buckling of Rear Gear Load L Load For Rear Gear: L ~ 15.3 in Ref. Gere pg. 763 L Where L = Length (in) E = Young’s Modulus (psi) I = Moment of Inertia (in4) A = Cross Sectional Area (in2) Load Assumptions: Pinned-Pinned Column 1st Mode Buckling No Eccentricity For Rear Gear: L ~ 15.3 in

Compressive Failure of Rear Gear Load L Ref. MIL-HDBK-5H: 3-255 Where Load = (Weight)(S.F.)(Gloading) A = Cross Sectional Area (in2) Load Assumptions: Weight = 53 lbf Gloading = 10 S.F. = 1.5 Aluminum 6061-T6 No Buckling

Smallest easily obtainable tubing: 1” x 1” x 0.062” Stress on Rear Gear Smallest easily obtainable tubing: 1” x 1” x 0.062” t=0.062” t=0.125”

Great, what about the bungee? Consider worst reasonable landing situation Moving at (1.1)Vstall 5 feet above ground Aircraft falls out of the sky Can the bungee absorb the energy associated with this landing?

Great, what about the bungee? Assumptions: Weight = 53 lbf Vstall = 30 ft/sec Altitude = 5 ft Don’t want x to exceed 3 inches (beyond initial stretch) on landing

What Spring Constant is Needed? Required k ~ 3.75 lbf/in 1/k ~ 0.266 in/lbf

What is the Spring Constant? Relaxed Length ~18 inches

Front Gear Design Aluminum Bolt Nylon Bolt Front Gear Provides pivot for gear (does not break) Nylon Bolt Breaks during hard landing Front Gear Designed not to break Designed not to bend

How Big is the Bolt? Diameter of nylon bolt = 0.5 in Load Reaction Ref. Gere pg 900 Load If load = (Weight)(S.F.)(Gloading) = 795 lbf Reaction = 1770 lbf (instantaneous) Need cross sectional area of bolt to be 0.197 in2 Diameter of nylon bolt = 0.5 in Reaction Assumptions: Weight = 53 lbf Gloading = 10 S.F. = 1.5 3.1” 6.9”

Updated Weight Estimate

Questions?