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David Childers February 21, 2008 Structures Cost Center of Mass

David Childers February 21, 2008 Structures Cost Center of Mass. Thanks to John Tsohas for the contacts Structures Group for research. Big Change in Cost. Previous Cost Inclusions Sheet Metal Rolling Raw Material Rivets Welding. Major Change Tank cost Two Methods:

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David Childers February 21, 2008 Structures Cost Center of Mass

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  1. David ChildersFebruary 21, 2008 Structures Cost Center of Mass • Thanks to John Tsohas for the contacts • Structures Group for research AAE 450 Spring 2008

  2. Big Change in Cost • Previous Cost Inclusions • Sheet Metal Rolling • Raw Material • Rivets • Welding • Major Change • Tank cost • Two Methods: • ATK Satellite Tanks • Spincraft Manufacturing Costs AAE 450 Spring 2008 2<#> Structures

  3. Test Case: LG-CA-DA-DT (ATK Costs) Structures Costs Only Tank Cost Equation: y = 157169Ln(x) + 714253, where x=volume AAE 450 Spring 2008 3<#> Structures

  4. Test Case: LG-CA-DA-DT (Spincraft Costs) Structures Costs Only

  5. Cost Breakdown • Material • Rate: • Al=$13.23/kg (Space grade) • Stl=$0.23/kg • Ti=$88.91/kg • Manufacturing • With ATK Tanks • $70/hr for 5 hrs/sheet • Ti 5.5 times longer than Al or Stl • Performed for: • Nose cone, Skirts, Skin between tanks • Spincraft • Labor=$150/hr • Al &Stl: 26 wks (40hrs/wk) • Ti: 52 wks • Welding • $150/hr • Times: • Al=0.6m/hr • Stl=0.65m/hr • Ti=0.325m/hr • Rivets • 1 rivet/6in (1r/0.152m) • $0.73/rivet • 0.049 hr/rivet • $52/hr AAE 450 Spring 2008 5<#> Structures

  6. ATK Tank Costs Walter Tam, ATK • Tank Notes • Composites • $2 mil for small volume tank & 2 yrs to build AAE 450 Spring 2008 Structures

  7. Tank Costs • Lower left plot used for cost determination • Above plot scheme fails due to dip between 0.15 and 0.4m3 • Cost does not decrease then increase again Plots by David Childers AAE 450 Spring 2008 7<#> Structures

  8. References • Paul Morissette, Gilchrist Metalfab • Walter Tam of ATK Space Systems, Inc. (PSI Operations), http://www.psi-pci.com/. • Mike Murphy, Spincrafthttp://www.spincraft.net/aerospace.htm. • Mark Sutton, G.E. • COST CONSIDERATIONS IN USING TITANIUM, GREEN, E. A., COULON, J. F. Lockheed-California Company, Burbank, California v AlAA Paper. • http://www.metalprices.com/ • TitaniumJoe.com • Youngstown Tool & Die Co. • RobotMarketplace.com AAE 450 Spring 2008 8<#> Structures

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