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STRUCTURES

STRUCTURES. Primary Material Downselection. M ass E stimating G enerator for S tructural C omponents (MEGSc) Excel based software package Internal to TBA Allows for quick relative mass comparisons between various aerospace materials as applied within particular launch

gretchen-herrmann
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STRUCTURES

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  1. STRUCTURES Primary Material Downselection • Mass Estimating Generator for Structural Components (MEGSc) • Excel based software package • Internal to TBA • Allows for quick relative mass comparisons between various • aerospace materials as applied within particular launch • environments

  2. STRUCTURES Primary Material Downselection • Mass Estimating Generator for Structural Components (MEGSc) • Idealizes the spacecraft within the launch vehicle fairing as a • cantilevered cylinder whose mass is evenly distributed • Capable of computing the minimum thickness of the • cylindrical monocoque to meet all given conditions • Leading to a 1st order approximation of structural mass

  3. STRUCTURES Primary Material Downselection

  4. STRUCTURES Primary Material Downselection • Aluminum 7075 • Readily available • Relatively inexpensive • Weldable • Easily machined and formed • High strength • Low density Ideal Material For Constructing Spacecraft Bus and Necessary Support Structure

  5. STRUCTURES Bus Structure • Initial Estimates • Diameter: 3 m • Length: 3 m • Thickness: 0.6 cm • Mass: 475 kg Insert CAD of main spacecraft

  6. STRUCTURES Bus Structure – Sandwich Construction A B C 12-cm 12-cm 12-cm 0.5-cm 3.33-cm 1-cm 3.0-cm 0.5-cm (Core Does Not Contribute) A) Thin face sheets have little bending stiffness, as indicated by the small value of I. B) The bending stiffness is increased by separating the faces with a low density core. C) A monocoque wall thickness of 3.33-cm is required to obtain bending stiffness equal to the sandwich panel at three times the mass. Provides 10% Reduction, Optimizing Bus System Mass at 425 kg

  7. STRUCTURES • Other Considerations • Interstage Adapter • 3 m diameter by 2 m sandwich constructed shell • MEGSc software used to estimate mass at 285 kg • Thrust Structure • Approximated based upon percentage of total vacuum thrust • provided by the seven NTR’s • Assuming 0.25% of total stage vacuum thrust, mass is • estimated at 25 kg.

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