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AAE 450 Spring 2008 Molly Kane February 28, 2008 Structures Group Inert Mass/Standard Deviations

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AAE 450 Spring 2008 Tolerances Method of Calculation 10 ft 1/8 in. Nominal Area = 100 ft 2 = m 2 Maximum Area = ft 2 = m 2 Minimum Area = ft 2 = m 2 Divide nominal volume by thickness to get “area”. Add tolerances to area based on change in sample area. Multiply by thickness to get minimum/maximum volumes. Multiply by density to get masses. Structures Group Tolerance (max) = Tolerance (min) =

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For skirts, thickness is constant. t_skirt = 3.5 mm Thickness tolerance is then t_skirt_tolerance = 0.08 mm Tolerances for tank thickness varied with nominal tank thickness. t_tank_tolerance = 0.04 mm – 0.07 mm Tolerances, cont’d All tolerances were then combined to find the lowest mass and highest mass options. SB-HA-DA-DAMB-HA-DA-DALB-HA-DA-DA Nom Total Min Total Max Total Std Dev % Included in inert mass: Tanks Skirts Nose Cone Pressure addition

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AAE 450 Spring 2008 Backup Slides Structures Group SB-HA- DA-DA MB-HA- DA-DA LB-HA- DA-DA Nom Total Min Total Max Total Std Dev % SB-HA- DA-DA MB-HA- DA-DA LB-HA- DA-DA Tank Nom Tank Min Tank Max Intertank Nom Intertank Min Intertank Max Skirt Nom Skirt Min Skirt Max Nose Cone Pressure

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AAE 450 Spring 2008 Structures Group VanguardSB-HA-DA-DAMB-HA-DA-DALB-HA-DA-DA Stage 1 Nominal (m) Stage 1 Std Dev Stage 1 %error % Stage 2 Nominal (m) Stage 2 Std Dev Stage 2 %error % Stage 3 Nominal (m)n/a Stage 3 Std Devn/a Stage 3 %errorn/a % Vanguard Standards SB- HA- DA-DA MB- HA- DA-DA LB- HA- DA-DA Nom Total Min Total Max Total Code Total

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Thickness (mm)Tolerance (mm) Table 11-2 from Kverneland

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Backup Slides Table 10-2B from Kverneland

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References Kverneland, K. O., Metric Standards for World Wide Manufacturing, The American Society of Mechanical Engineers, 1996, N.Y.,N.Y. Schwing, A., Standard Deviation Presentation Gilchrist Metal Fabricating,

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