- #1
gimini75
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Hello
I have an assignemt to analysis a landing gear for the cyclone earoplane, an initial design being supplied, I have being askedto check for the suitability of the part, the conditions are:
Aircraft mass with fuel: 43000 lbs
Landing speed: 65 Knots
Maximum deceleration: 3g
Each part takes 25% of the landing load (see the picture attached)
External diameters cannot be exceed or pitch between lug centres changed.
Factor of safety for landing load: 1.5
Maximum number of landings: 500000
Here what I have done, I converted all units to (N, mm), the mass of the aeroplane is (0.45 x 43000 = 19350 Kg), speed (=65 x 0.514 = 33.41 m/s), Force (= 19350 x 3g = 564.47 kN), I found force in Y direction = 516.115
X = 238.555 kN (Fx=Fcos25), but when I run the vo mises ProMechanica analysis I found (40190 N/mm2, which is to high as I have to choose a material from a list provided to me, the max is (H950 with 1517 MPa), now I don't understand what mistake I have made for my analysis, I appreciate any help from you.
Thanks
I have an assignemt to analysis a landing gear for the cyclone earoplane, an initial design being supplied, I have being askedto check for the suitability of the part, the conditions are:
Aircraft mass with fuel: 43000 lbs
Landing speed: 65 Knots
Maximum deceleration: 3g
Each part takes 25% of the landing load (see the picture attached)
External diameters cannot be exceed or pitch between lug centres changed.
Factor of safety for landing load: 1.5
Maximum number of landings: 500000
Here what I have done, I converted all units to (N, mm), the mass of the aeroplane is (0.45 x 43000 = 19350 Kg), speed (=65 x 0.514 = 33.41 m/s), Force (= 19350 x 3g = 564.47 kN), I found force in Y direction = 516.115
X = 238.555 kN (Fx=Fcos25), but when I run the vo mises ProMechanica analysis I found (40190 N/mm2, which is to high as I have to choose a material from a list provided to me, the max is (H950 with 1517 MPa), now I don't understand what mistake I have made for my analysis, I appreciate any help from you.
Thanks
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