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  • 1
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    Feasibility assessment of the Get-Away Tether Experiment (1986)
    In:  Other Sources
    Details
    Publication Date: 2018-12-01
    Description: The small free-flying tether system deployable from a Get-Away Special canister is analyzed. The objectives of the GAS experiment which include demonstrating electric power generation and orbital reboost using electrodynamic technology, measuring micrometeoroid hazards to the tethers, conducting a radio propagation experiment, and measuring long wire radar-cross-section are discussed. The physical layout and components of the mother and daughter satellites are described. The command and control system of the tether system is examined. The electrodynamic experiments to be conducted after plasma contact is established and the electrodynamical capabilities of the system are considered.
    Keywords: ASTRONAUTICS (GENERAL)
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    NASA TECHNICAL REPORTS
  • 2
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    Jovian electrodynamic tether experiment (1991)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: A case is made for an electrodynamic tether scientific platform to be put into orbit around Jupiter as a follow-on to the present series of earth-based Tethered Satellite System (TSS) experiments. Preliminary system trades are made to bound the amount of power (assuming 100 percent plasma contactor efficiency) that can be obtained from the orbiting Jovian tether. With magnetic field strengths of roughly 4 to 7 Gauss, power levels of the order of 100 kilowatts can be obtained with a thin 500 km long tether. This should suffice to power a Jovian scientific experiment package. The electrodynamic tether also affords a loitering capability as it can be operated as a thruster in addition to a power generator. Further study and research is needed to characterize the Jovian tether as to its electrodynamic and dynamic performance potential. Hollow cathode plasma contactor operation needs to be verified in near earth space.
    Keywords: ASTRONAUTICS (GENERAL)
    Type: AIAA PAPER 91-0426
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    NASA TECHNICAL REPORTS
  • 3
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    A manned Mars artificial gravity vehicle (1988)
    In:  Other Sources
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    Publication Date: 2019-07-13
    Description: Data are presented on an artificial-gravity vehicle that is being designed for a manned Mars mission, using a 'split-mission' concept, in which an unmanned cargo vehicle is sent earlier and stored in a Mars orbit for a rendezvous with a manned vehicle about 1.5 years later. Special attention is given to the vehicle trajectory and configuration, the tether design, and the vehicle weight and launch requirements. It is shown that an artificial-G vehicle for a manned Mars missions is feasible technically and programmatically. Using an artificial-G vehicle instead of a zero-G vehicle for the piloted portion of a split mission provides physiological and human-factor-related benefits, does not eliminate requirements for zero-G countermeasures research (since zero-G is an abort mode), and could possibly reduce some life science activities. Diagrams are included.
    Keywords: ASTRONAUTICS (GENERAL)
    Type: Intl. Conference on Space Tethers for Science in the Space Station Era; Oct 04, 1987 - Oct 08, 1987; Venice; Italy
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    NASA TECHNICAL REPORTS
  • 4
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    Space Station tethered waste disposal (1988)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The Shuttle Transportation System (STS) launches more payload to the Space Station than can be returned creating an accumulation of waste. Several methods of deorbiting the waste are compared including an OMV, solid rocket motors, and a tether system. The use of tethers is shown to offer the unique potential of having a net savings in STS launch requirement. Tether technology is being developed which can satisfy the deorbit requirements but additional effort is required in waste processing, packaging, and container design. The first step in developing this capability is already underway in the Small Expendable Deployer System program. A developmental flight test of a tether initiated recovery system is seen as the second step in the evolution of this capability.
    Keywords: ASTRONAUTICS (GENERAL)
    Type: Intl. Conference on Space Tethers for Science in the Space Station Era; Oct 04, 1987 - Oct 08, 1987; Venice; Italy
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    NASA TECHNICAL REPORTS
  • 5
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    Get-Away tether experiment - Experimental plans (1988)
    In:  Other Sources
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    Publication Date: 2019-07-13
    Description: The experimental capabilities of the Get-Away Tether Experiment (GATE) are presented and a series of demonstration mission are proposed. The GATE is a free-flying tether system that will develop or demonstrate technology in the areas of tether dynamics (deployment and stabilization, retrieval, stationkeeping, and severance), tether electrodynamics, micrometeor hazards to tethers, and disturbance rejection. The system consists of two subsatellites connected by 1 km of tether. The free-flying system is ejected from the Orbiter via a Getaway Special (GAS) canister. Two dynamics missions are profiled along with a description of electrodynamic mission capabilities. The dynamic interactions of the end body and tether may be observed from the Orbiter or from an on-board video tracking system. Hence, GATE provides a unique, low cost capability to demonstrate various tether technologies, and address critical design and safety issues associated with future tether applications. An assessment of the significant measurable parameters and associated instrumentation is given. Future work and system development projection schedules are also outlined.
    Keywords: ASTRONAUTICS (GENERAL)
    Type: Intl. Conference on Space Tethers for Science in the Space Station Era; Oct 04, 1987 - Oct 08, 1987; Venice; Italy
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    NASA TECHNICAL REPORTS
  • 6
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    Early tether dynamics flight experiments (1988)
    In:  Other Sources
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    Publication Date: 2019-07-13
    Description: This paper proposes an evolutionary series of tether-dynamics flight experiments using the Small Expendable Deployer System (SEDS). Such experiments could be launched as secondary payloads on the Delta ELV. The purpose of the series of experiments is to acquire data on tether deployment rate, tension, tether shape, and operating environment to compared with computer-based tether simulations. A second purpose is to serve as a precursor for the Orbiter-based SEDS, since both the tether deployer and the flight profile are similar. Additional flights could observe tether dynamics over a much wider range of operational and environmental conditions and could employ more comprehensive measurements.
    Keywords: ASTRONAUTICS (GENERAL)
    Type: Intl. Conference on Space Tethers for Science in the Space Station Era; Oct 04, 1987 - Oct 08, 1987; Venice; Italy
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    NASA TECHNICAL REPORTS
  • 7
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    An artificial gravity demonstration experiment (1989)
    In:  Other Sources
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    Publication Date: 2019-07-13
    Description: An artificial gravity experiment which is tethered to a Delta second stage and which uses the Small Expendable Deployer System is proposed. Following tether deployment, the Delta vehicle performs the required spin-up maneuver and can then be passivated. A surplus reentry vehicle houses the artificial gravity life science experiments. When the experiments are completed, the reentry phase of the experiment is initiated by synchronizing the spin of the configuration with the required deorbit impulse.
    Keywords: ASTRONAUTICS (GENERAL)
    Type: AIAA PAPER 89-1589 , International Conference on Tethers in Space - Toward Flight; May 17, 1989 - May 19, 1989; San Francisco, CA; United States
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    NASA TECHNICAL REPORTS
  • 8
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    Tethered Dynamics Explorer and Tethered Atmospheric Probe - A low-cost, low-risk tethered satellite program (1989)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A tethered satellite flight program to test theoretical studies of tether concepts is proposed. The program consists of multiple flights of an ELV such as the Delta II, using the Small Expendable Deployment System (SEDS) to deploy two instrumented satellite payloads, the Tethered Dynamics Explorer (TDE) and the Tethered Atmospheric Probe (TAP). The applications and characteristics of the TDE and the TAP are described, including verification of the SEDS, the validation of the dynamics and control model for low-tension deployment and the force and moment instrumentation, the demonstration of tether initiated reentry, the collection of in-situ atmospheric and aerothermodynamic data, and the study of long-term tether exposure.
    Keywords: ASTRONAUTICS (GENERAL)
    Type: AIAA PAPER 89-1563 , International Conference on Tethers in Space - Toward Flight; May 17, 1989 - May 19, 1989; San Francisco, CA; United States
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    NASA TECHNICAL REPORTS
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