Question

Imagine the structural part of the wing of an Aero-plane is made with two steel W-beams in parallel. Each of Boeing 747-400 two engines weighs 8800 lb. Design the lightest possible beam that helps fuel saving during the cruise. Don't ignore beam weight. Cantilever Beam Wings of a Stationary Aircraft is a Cantilever Beam Load on the Beam 20 ft 20 ft 2011 40 ft Free end Fixed end Note: For the design problems you can assume some unknown parameters.

Answer 1

5820 TE Question Fixed End Free Try weight of End each Beeing - 8800 lb - 8800X3202 ft/s² Calculation of support Reaction: = 283360 lbf Rv = 2X 283360+ 100 XL.d? x 493-18 - 0 surning the crogl-section of beam in circular & density of steel 493.18 pound (ft3. Here maximum Bending moment occurs at point A(Fixed point] MA=223360X40 +283360 Xaot 1935 38714.63d² MAS 34003200438714.63d² Then from Bending eqn 11 = 28 Bending stress ob=32M for circular crosr-section we know. where Mas Bending Moment de diameter of cross-section Bending strength of of steel = 7309901.98 pound forcefft? now putting the value in above egn. TdX2309901098 = 34003209+ 38714.63d? 917647.94 d² - 38714.63d²-34003200 =0 on solving above equation [d=3.636 ft answer