Moon & Mars Orbiting Spinning Tether Transport - Tethers Unlimited

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Appendix L: Tether Boost Facility Design Final Report• Waste heat from power conversion for ED thrust — Drives thermal controldesign/mass which impacts station configuration and structural design ofED tether bayThe Control Station was assumed to follow the 41:20 Resonance Designmission profile provided by TUI and was assumed to be launched by a Delta IV-H ona due east launch to a 600 km circular orbit, 28° inclination.3.6.2 Mass Properties StatementThe mass properties, summarized in Table 3-1, show an operational Facility(Control Station, tether, Grapple) that can be launched with a single launch of a DeltaIV-Heavy is feasible. Mass margins between 25-30% at this level of conceptualdesign are desirable. Note the two overall mass margins labeled “Bottom-upCalculated Margin,” and “Available Margin,” in Table 3-1. The mass properties wereestimated using a bottom-up approach, starting from the component level of eachsubsystem. Mass margins were placed upon each subsystem component; the sumof these component-level margins expressed as a percentage of estimated ControlStation mass is the “Bottom-up Calculated Margin.” The “Available Margin” is theallowable mass growth for a single launch on a Delta IV-H. The lower “Bottom-upMargin” indicates the estimated Control Station mass may be low, but the fact thatthe “Available Margin” is higher indicates that there is reasonable margin for massgrowth. Table 3-2 shows a more detailed mass properties statement.3.6.3 New Issues and Requirements IdentifiedAs design development continues, the launch configuration is growing inimportance. A quick look at launch configurations showed that the current conceptlooks promising, but still is not geometrically sized to fit within the Delta IV-H dynamicP/L envelope. This was not unexpected, with the level of subsystem definition at thisphase. The only other new configuration requirements involve PV array and FEACpackaging requirements. The FEAC panels must be sealed prior to flight, with aminimum requirement of a GN2 environment. This leads to derived requirements forFEAC packaging: a vented housing with a removable cover to expose the FEACpanels to space. FEAC packaging is expected to be a beefed up box with amechanized cover release and panel deployment system. The packagingrequirements were taken into account for the FEAC mass estimate.L-67
Appendix L: Tether Boost Facility Design Final ReportTable 3-1. MMOSTT Control Station Mass Properties SummaryDue east launch, 350 km circular orbit at 28-deg inclination41:20ResonanceDesignDelta IV-H Useful Load 23,768Delta IV Payload Adapter Fitting mass 386Delta IV-H Max Payload mass (GLOW) 23,382Grapple Mass (assumed a constant) 650Tether Mass (assumed a constant) 8,274Maximum Control Station Mass(Delta IV-H Max Payload Mass – Grapple Mass – Tether Mass)Estimated Control Station Mass (kg)14,458No Margin 10,967Bottom-up Calculated Margin 2,300Avg. Margin 21%Mass with Bottom-up Margin 13,267Available MarginAvailable Margin = 1-(Maximum – Estimated Control Station Mass)Estimated GLOW vs. Delta IV-H Payload GLOWEstimated GLOW (No margin C. Station)3.6.3.1.1.1.1 GLOW = Control Station + Tether + Grapple mass32%19,891Margin 3,491Avg. Margin 15%On-Orbit MassExpended Upper Stage Mass 3,467On-Orbit Mass (No margin C. Station)On-Orbit Mass = Control Station + Tether + Grapple + ExpendedUpper Stage Mass23,358L-68
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Tethers Unlimited, Inc.MMOSTT Final
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NIAC Funded Tether Research• Moon
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Electrodynamic Reboost• Power sup
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Cislunar Tether Transport System•
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MXER Tethers Included in NASA’sII
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5mt Payload Tether Boost Facilityfo
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LEOGTO Boost Facility• Initial Fa
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Tether Boost FacilityControl Statio
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LEOGTO Boost Facility• TetherSim
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Rendezvous• Rapid AR&C Capability
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Proposed RETRIEVE TetherExperiment
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µTORQUE on Delta IV• Delta-IV Se
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Opportunities for NASATechnology De
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AIAA 2000-3842COMMERCIAL DEVELOPMEN
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--Commercial Tether Transport AIAA
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-Commercial Tether Transport AIAA 2
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Commercial Tether Transport AIAA 20
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Commercial Tether Transport AIAA 20
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Momentum Exchange/Electrodynamic Re
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DESIGN AND SIMULATION OF A TETHER B
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Tether Boost Facility Design AIAA 2
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Tethers Unlimited, Inc.Cislunar Tet
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Interim Report Outline- Configurati
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Mission Definition¥ Payload Capaci
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Baseline Control Station DetailsTET
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Baseline Grapple AssemblyCAPTURES A
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LEO Facility System ArchitectureGRA
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Payload Adapter Assembly Subsystems
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Potential Reeling FunctionsReeling
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LEO Control Station Weights16
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Payload Adapter Assembly Weights18
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Tether Boost FacilityRequired Power
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Electrical Propulsion Voltage´ Spe
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Potential Reeling FunctionsReeling
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Preliminary Reeling AnalysisθθAss
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Tether Boost FacilitySystem Require
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Table of Contents1 Scope ..........
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2 ReferencesThis section lists docu
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The system shall measure and contro
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4 Ground Rules & AssumptionsThis se
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Appendix F: Tether Boost Facility D
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Appendix F Tether Boost Facility De
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Appendix F Tether Boost Facility De
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Page 134 and 135: Appendix F: Tether Boost Facility D
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Page 194 and 195: Tethers Unlimited, Inc.Tether Rende
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Page 208 and 209: Cislunar Tether Transport System•
Page 210 and 211: Rapid Earth-Mars Transport• Reusa
Page 212 and 213: EarthMars Launch Windows• MMOSTT
Page 214 and 215: Incremental Development Path1. TORQ
Page 216 and 217: LEOGTO Boost Facility• TetherSim
Page 218 and 219: Tether Boost FacilityControl Statio
Page 220 and 221: Modular Design• Design Components
Page 222 and 223: Payload Accommodation AssemblyConfi
Page 224 and 225: Electrodynamic Thrusting• Drive c
Page 226 and 227: Tether Facility Reboost• Use Elec
Page 228 and 229: Rendezvous• Rapid Automated Rende
Page 230 and 231: Rendezvous Method: Preparation• P
Page 232 and 233: Development Issues• Automated Ren
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Potential Flight Experiments• Hig
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Opportunities for NASATechnology De
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Acknowledgements• Boeing/RSS - Jo
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IAF-99-A.5.10RAPID INTERPLANETARY T
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Rapid Interplanetary Tether Transpo
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IAF-00-S.6.04TETHER SYSTEMS FOR SAT
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IAF-00-S.6.04controlled very precis
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IAF-00-S.6.04Perigee Altitude (km)3
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IAF-00-S.6.04The LEO⇒GTO Tether B
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IAF-00-S.6.04AcknowledgmentsThis re
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Tethers Unlimited, Inc.Appendix K:
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Tethers Unlimited, Inc.at a rate of
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Tethers Unlimited, Inc.Appendix L -
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Tethers Unlimited, Inc.Appendixm M:
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Appendix N. MXER Tether for Deployi
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Electrodynamic Thrustingto Reboost
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100000 95000 90000 85000 80000 7500
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Momentum Exchange/Electrodynamic Re
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NOMENCLATURESymbol MeaningA payload
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DepartureangleA = 1.5π - (ω + u
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Tether material has a "characterist
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Rendezvous of Grapple with PayloadT
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adius vector to the new center of m
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days from payload pickup at one pla
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"JupiterandBeyond"Tether cut CUT:<
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Tethers Unlimited, Inc.Appendix Q:
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Tethers Unlimited, Inc.Appendix R:
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Moon & Mars Orbiting Spinning Tether Transport - Tethers Unlimited

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