Moon & Mars Orbiting Spinning Tether Transport - Tethers Unlimited

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Tether Boost Facility Design AIAA 2000-3866Energy System:The tether current during one of the perigee passes isshown in Figure 13. The charge level of the energystorage system (batteries or flywheels) over the twodays is shown in Figure 14. With the solar power supply generating 150 kW during the portions of the orbitthat the tether facility is illuminated, and processedthrough the batteries at an efficiency of 88%, the system maintains its energy balance and the depth ofcharge does not exceed 20%.Battery Charge Level10.80.60.40.200 10 20 30 40Time (hours)Figure 14. Battery charge level.Analysis:The simulated system, which had 150 kW of solarpanel power and thrusted at 450 kW during perigeepasses, would reboost the orbit energy within approximately 20 days. To achieve the 30 day reboost desiredfor the LEO⇒GTO Tether Boost Facility, we thus needa lower solar panel power of approximately 100 kW.Thrusting would be performed at 300 kW during perigee passes, and tether current levels would be roughly15 A.SummaryWe have presented an orbital design and systemconceptlevel definition for a tether facility capable ofboosting 2,500 kg payloads from LEO to GTO onceevery 30 days. The entire tether facility is sized to enablean operational capability to be deployed with asingle Delta-IV-H launch. The system is designed in amodular fashion so that its capacity can be increasedwith additional launches. The tether facility can alsoboost 1000 kg payloads to lunar transfer orbits, andwill serve as the first building block of an Earth-Moon-Mars Tether Transportation Architecture. The tetherfacility will utilize electrodynamic tether propulsion torestore its orbit after each payload boost operation.Using numerical modeling we have validated the orbitaldesign of the system and investigated methods for performingelectrodynamic reboost of the station.AcknowledgmentsThis research was supported by Phase I and Phase IIgrants from NASAÕs Institute for Advanced Concepts.The author wishes to acknowledge important contributionsby Robert Forward of TUI and Michal Bangham,John Grant, Brian Tillotson, Beth Fleming, JohnBlumer, Ben Donahue, Bill Klus, and Harvey Willenbergof the Boeing Company, as well as valuable discussionswith Kirk Sorensen of NASA/MSFC.References1. Hoyt, R.P. Uphoff, C.W., ÒCislunar Tether TransportSystemÓ, J. Spacecraft and Rockets, 37(2), March-April 2000, pp. 177-186.2. Hoyt, R.P., ÒCislunar Tether Transport SystemÓ, TethersUnlimited, Inc. Final Report on NASA Institute forAdvanced Concepts Phase I Contract 07600-011, May1999. Downloadable from www.niac.usra.edu.3. Forward, R.L., Nordley, G., ÒMERITT: Mars-EarthRapid Interplanetary Tether Transport System Ð InitialFeasibility Study,Ó AIAA Paper 99-2151, 35 th JointPropulsion Conference, Los Angeles, CA, 20-24 June1999.4. Carroll, J.A, Preliminary Design of a 1 km/sec TetherTransport Facility, March 1991, Tether ApplicationsFinal Report on NASA Contract NASW-4461 withNASA/HQ.5. Hoyt, R.P., ÒTether System for Exchanging PayloadsBetween Low Earth Orbit and the Lunar Surface,Ó AIAAPaper 97-2794, 33rd AIAA/ASME/ ASE/ASEE JointPropulsion Conference, Seattle, WA, 6-9 July 1997.6. Forward, R.L., ÒTether Transport from LEO to the LunarSurface,Ó AIAA paper 91-2322, 27th AIAA/ASME/ASE/ASEE Joint Propulsion Conference, July 1991.7. Bangham, M, Lorenzini, E., Vestal, L. Tether TransportSystem Study, NASA TP-1998-206959.8. Failure Resistant Multiline Tether, Robert L. Forwardand Robert P. Hoyt, PCT/US97/05840, filed 22 April1997.9. Forward, R.L., Hoyt, R.P., ÒFailsafe MultilineHoytether Lifetimes,Ó AIAA paper 95-289031stAIAA/SAE/ASME/ASEE Joint Propulsion Conference,San Diego, CA, July 1995.9
Tethers Unlimited, Inc.Cislunar Tether TransportTHE CISLUNAR TETHER TRANSPORT SYSTEM ARCHITECTURERobert P. HoytTethers Unlimited, Inc.Seattle, Washingtonwww.tethers.com2 nd Lunar Development ConferenceLas Vegas, NVJuly 20-21, 20001
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Tethers Unlimited, Inc.MMOSTT Final
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Page 18 and 19: Tethers Unlimited, Inc.MMOSTT Final
Page 24 and 25: NIAC Funded Tether Research• Moon
Page 26 and 27: Electrodynamic Reboost• Power sup
Page 28 and 29: Cislunar Tether Transport System•
Page 30 and 31: MXER Tethers Included in NASA’sII
Page 32 and 33: 5mt Payload Tether Boost Facilityfo
Page 34 and 35: LEOGTO Boost Facility• Initial Fa
Page 36 and 37: Tether Boost FacilityControl Statio
Page 38 and 39: LEOGTO Boost Facility• TetherSim
Page 40 and 41: Rendezvous• Rapid AR&C Capability
Page 42 and 43: Proposed RETRIEVE TetherExperiment
Page 44 and 45: µTORQUE on Delta IV• Delta-IV Se
Page 46 and 47: Opportunities for NASATechnology De
Page 48 and 49: AIAA 2000-3842COMMERCIAL DEVELOPMEN
Page 50 and 51: --Commercial Tether Transport AIAA
Page 52 and 53: -Commercial Tether Transport AIAA 2
Page 54 and 55: Commercial Tether Transport AIAA 20
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Page 58 and 59: Momentum Exchange/Electrodynamic Re
Page 60 and 61: DESIGN AND SIMULATION OF A TETHER B
Page 62 and 63: Tether Boost Facility Design AIAA 2
Page 70 and 71: Tethers Unlimited, Inc.Cislunar Tet
Page 82 and 83: Interim Report Outline- Configurati
Page 84 and 85: Mission Definition¥ Payload Capaci
Page 86 and 87: Baseline Control Station DetailsTET
Page 88 and 89: Baseline Grapple AssemblyCAPTURES A
Page 90 and 91: LEO Facility System ArchitectureGRA
Page 92 and 93: Payload Adapter Assembly Subsystems
Page 94 and 95: Potential Reeling FunctionsReeling
Page 96 and 97: LEO Control Station Weights16
Page 98 and 99: Payload Adapter Assembly Weights18
Page 100 and 101: Tether Boost FacilityRequired Power
Page 102 and 103: Electrical Propulsion Voltage´ Spe
Page 104 and 105: Potential Reeling FunctionsReeling
Page 106 and 107: Preliminary Reeling AnalysisθθAss
Page 108 and 109: Tether Boost FacilitySystem Require
Page 110 and 111: Table of Contents1 Scope ..........
Page 112 and 113: 2 ReferencesThis section lists docu
Page 114 and 115: The system shall measure and contro
Page 116 and 117: 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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Appendix L: Tether Boost Facility D
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Tethers Unlimited, Inc.Tether Rende
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Ongoing Tether Work Under NIAC Fund
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Cislunar Tether Transport System•
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Rapid Earth-Mars Transport• Reusa
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EarthMars Launch Windows• MMOSTT
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Incremental Development Path1. TORQ
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LEOGTO Boost Facility• TetherSim
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Tether Boost FacilityControl Statio
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Modular Design• Design Components
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Payload Accommodation AssemblyConfi
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Electrodynamic Thrusting• Drive c
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Tether Facility Reboost• Use Elec
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Rendezvous• Rapid Automated Rende
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Rendezvous Method: Preparation• P
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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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