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Spacecraft Design and Sizing Dr Andrew Ketsdever MAE 5595 Lesson 14
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Spacecraft Design and Sizing Sizing Introduction Big Picture: The Mission drives the Payload and the Orbit, which drives the Spacecraft Design
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Spacecraft Design and Sizing Overview of Spacecraft Design & Sizing
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Spacecraft Design and Sizing Principal Requirements & Constraints for S/C Design
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Spacecraft Design and Sizing Weight Budget
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Spacecraft Design and Sizing Spacecraft Configuration Drivers
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Spacecraft Design and Sizing Can use historical data for next block of same S/C, or to generalize within a mission type
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Spacecraft Design and Sizing Mass Distribution for Selected Satellites
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Spacecraft Design and Sizing
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Spacecraft Design and Sizing Mass Distribution for Selected Satellites
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Spacecraft Design and Sizing Top-Down Sizing Example Given: navigation mission with m P/L = 50 kg Find: subsystem masses and m dry
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Spacecraft Design and Sizing Top-Down Sizing Example Still need other masses to permit eventual launch vehicle choice m kick is apogee kick motor – if needed m adapter counts against booster performance #s Need to include margin
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Spacecraft Design and Sizing S/C Budgets For top-down designs, allocate so much of a quantity or capability to each subsystem Types of budgets –Mass –Power –Communication bandwidth –Volume –Reliability –Pointing error –Cost –Schedule, etc
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Spacecraft Design and Sizing Mass Budget See previous navigation S/C example → Now add mass margin into calculation Margin covers the uncertainty in our estimates –Typical range from 5% to 25% –Larger margin for new S/C, or earlier in design phase –Smaller margin for known S/C, or as design progresses
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Spacecraft Design and Sizing Preparing a Power Budget
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Spacecraft Design and Sizing Typical Power Consumption by Module or Subsystem
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Spacecraft Design and Sizing Propellant Budget List v’s Use ideal rocket equation to convert v to propellant mass
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Spacecraft Design and Sizing Propellant Budget
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Spacecraft Design and Sizing Estimating Spacecraft Equipment Compartment Dimensions
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