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Jul 21, 2010
07/10
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Noda, T
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The commercialization of solar power generation necessitates the development of low cost manufacturing method of silicon suitable for solar cells. The manufacturing methods of semiconductor grade silicon (SEG-Si) and the development of solar grade silicon (SOG-Si) in foreign countries was investigated. It was concluded that the most efficient method of developing such materials was the hydrogen reduction process of trichlorosilane (TCS), using a fluidized bed reactor. The low cost reduction of...
Topics: SPACE STATIONS, TETHERED SATELLITES, TETHERLINES, ELECTRODYNAMICS, MICROGRAVITY, SPACE...
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302
Jun 12, 2011
06/11
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Kraal, E. R.; Moore, J. M.; Howard, A. D.; Asphaug, E. A
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Moore and Howard [1] reported the discovery of large alluvial fans in craters on Mars. Their initial survey from 0-30 S found that these fans clustered in three distinct regions and occurred at around the 1 km MOLA defined Mars datum. However, due to incomplete image coverage, Moore and Howard [1]could not conduct a comprehensive survey. They also recognized, though did not quantitatively address, gravity scaling issues. Here, we briefly discuss the identification of alluvial fans on Mars, then...
Topics: LUNAR SURFACE, ROVING VEHICLES, NANOTECHNOLOGY, AUTONOMY, TETRAHEDRONS, TETHERLINES, MISSION...
161
161
May 31, 2011
05/11
by
Colozza, Anthony J
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A general characteristic of photovoltaics is that they increase in efficiency as their operating temperature decreases. Based on this principal, the ability to increase a solar aircraft's performance by cooling the solar cells was examined. The solar cells were cooled by channeling some air underneath the cells and providing a convective cooling path to the back side of the array. A full energy balance and flow analysis of the air within the cooling passage was performed. The analysis was first...
Topics: EQUIPMENT SPECIFICATIONS, SPACECRAFT DESIGN, TETHERING, ARTIFICIAL SATELLITES, MISSION PLANNING,...
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207
Aug 2, 2010
08/10
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Reifer, Donald J
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The lessons learned and experience gleaned are described by those who have started to implement the reuse metrics and measurement framework used in controlling the development of common avionics and software for its affiliated aircraft programs. The framework was developed to permit the measurement of the long term cost/benefits resulting from the creation and use of Reusable Software Objects (RSOs). The framework also monitors the efficiency and effectiveness of the Software Reuse Library...
Topics: CONFERENCES, HANDBOOKS, SPACE MISSIONS, TETHERING, TETHERLINES, AERODYNAMICS, GRAVITY WAVES,...
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257
Jul 12, 2010
07/10
by
Stohrer, F. F.; Pinelli, T. E
texts
eye 257
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The present environment of the technical report is vast, with considerable variance in report components, format, and organization. As part of the Langley Scientific and Technical Information (STI) Review and Evaluation Project, a review of the technical report as an effective product for information communication was undertaken. Style manuals describing theory and practice in technical report preparation; publication manuals covering such factors as design, layout, and type style: and copies...
Topics: LAUNCHING, ORBITAL MECHANICS, TETHERLINES, TRANSFER ORBITS, NUMERICAL ANALYSIS, PAYLOADS, SPACE...
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250
Jun 13, 2011
06/11
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Mittlefehldt, D. W.; Rumble, D., II
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Main-group pallasites (PMG) are mixtures of iron-nickel metal and magnesian olivine thought to have been formed at the core-mantle boundary of an asteroid [1]. Some have anomalous metal compositions (PMG-am) and a few have atypically ferroan olivines (PMG-as) [2]. PMG metal is consistent with an origin as a late fractionate of the IIIAB iron core [2]. Most PMG olivines have very similar Fe/Mg ratios, likely due to subsolidus redox reaction with the metal [3]. In contrast, minor and trace...
Topics: SOLAR ELECTRIC PROPULSION, FABRICATION, SOLAR SAILS, TETHERLINES, AEROCAPTURE, CHEMICAL PROPULSION,...
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335
May 29, 2011
05/11
by
NON
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This report lists reports, articles and other documents recently announced in the NASA STI Database.
Topics: ELECTRIC PROPULSION, RESEARCH, FEASIBILITY, TETHERLINES, SOLAR SYSTEM, PLASMA ENGINES, SPACE...
299
299
Jun 12, 2011
06/11
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Filman, Robert E
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In ''The Green Isle in the Sea'', James Thurber relates a Lemony Snicket-style series of unfortunate events that happened to an old gentleman one day, concluding with a moral amplifying a theme from Robert Louis Stevenson: ''The world is so full of a number of things. I am sure we should all be as happy as kings, and you know how happy kings are.''
Topics: TETHERING, TETHERLINES, TECHNOLOGY ASSESSMENT, MOMENTUM TRANSFER, ELECTRODYNAMICS, LOW EARTH...
389
389
Jun 9, 2011
06/11
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DiCarlo, James A.; Bhatt, R. T
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Using data from panels with 2D woven architectures,t his presentation describes progress in identifying advanced constituent materials and processes for achieving a high conductivity SiC/SiC composite system with long-term structural life under oxidizing conditions at 2600 degrees F. A key factor for this progress is the development of approaches at NASA GRC that allow the constituent SiC fiber and SiC matrix to display high thermal conductivity, high creep-rupture resistance and high...
Topics: SPACECRAFT CHARGING, EXTERNAL SURFACE CURRENTS, CONFERENCES, SPACE PLASMAS, COMPUTERIZED...
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979
May 21, 2011
05/11
by
NON
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The finding of Midwest Research Institute (MRI) is that the economic impact of NASA research and development expenditures is substantial. NASA's role in the economic and technological growth of the United States is also substantial as illustrated in two case studies: digital communications and civil aeronautics performance and efficiency. In addition, it has been clear that NASA has also had an impact in a broad range of technological areas. During the course of conducting the study, some 250...
Topics: ELECTRICAL RESISTIVITY, METAL COATINGS, OXYGENATION, FABRICATION, FRACTURE STRENGTH, KEVLAR...
This Final report summarizes the work performed for Small Expendable Tether Deployer Systems (SEDS) Tether Dynamics Analysis in support of the Marshall Space Flight Center.
Topics: NASA Technical Reports Server (NTRS), TETHERING, DEPLOYMENT, TETHERLINES, REELS, TETHERED...
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May 31, 2011
05/11
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Dorais, Gregory A.; Gawdiak, Yur
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The need for spacecraft mobile robots continues to grow. These robots offer the potential to increase the capability, productivity, and duration of space missions while decreasing mission risk and cost. Spacecraft Mobile Robots (SMRs) can serve a number of functions inside and outside of spacecraft from simpler tasks, such as performing visual diagnostics and crew support, to more complex tasks, such as performing maintenance and in-situ construction. One of the predominant challenges to...
Topics: THRUST, ORBIT CALCULATION, SPACEBORNE EXPERIMENTS, TETHERLINES, DEPLOYMENT, PROPULSION, TETHERING,...
289
289
Jul 26, 2010
07/10
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Bansal, Narottam P.; Deguire, Mark R
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Bi sub 1.5 SrCaCu sub 2 O sub x has been prepared in the glassy state by rapid quenching of the melt. The kinetics of crystallization of various phases in the glass have been evaluated by a variable heating rate differential scanning calorimetry method. The formation various phases on thermal treatments of the glass has been investigated by powder X-ray diffraction and electrical resistivity measurements. Heating at 450 C formed Bi sub 2 Sr sub 2 CuO sub 6, which disappeared on further heating...
Topics: EXTRAVEHICULAR ACTIVITY, TOOLS, FAILURE MODES, SPACE SHUTTLE ORBITERS, SPACE SUITS, SPACECRAFT...
The generation and injection of electromagnetic waves in space plasma by means of a long orbiting tether are considered. The objectives include an estimation of the portions of the primary electrodynamic power developed by the tether that goes to excite each of various wave generation and injection mechanisms expected to be present during a tether's orbital flight, an evaluation of the signal levels associated with each one of the mechanisms above, and verification of their detectability with...
Topics: NASA Technical Reports Server (NTRS), ELECTROMAGNETIC RADIATION, MAGNETOHYDRODYNAMIC WAVES, SPACE...
A closed-loop control system was added to the tether reel which improves control over the tethered satellite. In addition to increasing the stability of the tethered satellite along local vertical, this control system is used for deployment and retrieval of tethered satellites. This conceptual design study describes a tether system for suspending a science payload at an altitude of 120 km from space shuttle orbiter flying at an altitude of 200 km. In addition to the hardware conceptual designs,...
Topics: NASA Technical Reports Server (NTRS), SATELLITE CONTROL, SPACE SHUTTLE ORBITERS, STRUCTURAL DESIGN,...
For a range of tether lengths, end masses, and orbits, tether deployment concepts were defined and/or analyzed from the Orbiter for steady state/dynamic and up/down deployments and from circular/elliptical orbits. Orbits were defined and/or analyzed for end mass releasing concepts with steady state and dynamic releases taking into account tether and end mass motion before and after release. For a range of tether lengths, end masses, and orbits, tether retrieving or disposing concepts were...
Topics: NASA Technical Reports Server (NTRS), COMPUTER PROGRAMS, DAMPING, DIGITAL SIMULATION, TENSION,...
272
272
Jun 12, 2011
06/11
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Gittemeier, Keith A.; Hawk, Clark W.; Finckenor, Miria M.; Watts, E
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The University of Alabama in Huntsville s Propulsion Research Center has teamed with NASA's Marshall Space Flight Center (MSFC) to research the effects of atomic oxygen (AO) bombardment on coated tether materials. Tethers Unlimited Inc. has provided several candidate tether materials with various coatings for AO exposure in MSFC s Atomic Oxygen Beam Facility. Additional samples were exposed to ultraviolet (UV) radiation at MSFC. AO erodes most organic materials, and ultraviolet radiation...
Topics: TETHERING, SYSTEMS ENGINEERING, MOON, TETHERLINES, PAYLOADS, MARS EXPLORATION, FORMATION FLYING,...
The task of prediction of the motion of a momentum exchange system with a 9-digit accuracy is extremely challenging, and it is relentlessly testing our ability to gain fundamental insights into the nature of the tether dynamics in this system. It has been show that the modal decomposition approach developed in the first part of this study is a very powerful and precise tool for the simulation of the dynamics of momentum exchange tethers. However, to get a prediction with required accuracy using...
Topics: NASA Technical Reports Server (NTRS), TETHERING, ENVIRONMENT MODELS, DECOMPOSITION, PREDICTIONS,...
Housekeeping in the space industry? You may think the idea isn't technical enough for the shuttle program. Yet, eliminating Foreign Object Debris or FOD is an important goal for USA and NASA. The justification for this effort is based on data from the aeronautics industry. Experience has shown that if debris is not controlled, it may later cause a variety of in-flight issues. FOD can result in material damage, or make systems and equipment inoperable unsafe, or less efficient
Topics: NASA Technical Reports Server (NTRS), DAMAGE, DEBRIS, HOUSEKEEPING (SPACECRAFT), WASTES,...
Instrumented model drogue tests were conducted in a ship model towing tank. The purpose of the tests was to observe and measure deployment and drag characteristics of such shapes as parachutes, crossed vanes, and window shades which may be employed in conjunction with free drifting buoys. Both Froude and Reynolds scaling laws were applied while scaling to full scale relative velocities of from 0 to 0.2 knots. A weighted window shade drogue is recommended because of its performance, high drag...
Topics: NASA Technical Reports Server (NTRS), BUOYS, DRAG CHUTES, SCALE MODELS, COSTS, OCEANOGRAPHY,...
An underwater sound source is described that may be ejectably mounted on any mobile device that travels over water, to facilitate in the location and recovery of the device when submerged. A length of flexible line maintains a connection between the mobile device and the sound source. During recovery, the sound source is located be particularly useful in the recovery of spent rocket motors that bury in the ocean floor upon impact.
Topics: NASA Technical Reports Server (NTRS), RECOVERABILITY, SOUND GENERATORS, UNDERWATER ENGINEERING,...
The workshop was attended by persons from government, industry, and academic institutions to discuss the rapidly evolving area of tether applications in space. Many new applications were presented at the workshop, and existing applications were revised, refined, and prioritized as to which applications should be implemented and when. The workshop concluded with summaries developed individually and jointly by each of the applications panels.
Topics: NASA Technical Reports Server (NTRS), SPACE STATIONS, TETHERED SATELLITES, TETHERLINES,...
A recent development in spacecraft mission design involves the increasing use of Distributed Spacecraft Systems (DSS). Several key technologies must mature sufficiently to facilitate these missions, including the use of spacecraft flying in tightly controlled formations. Such formations may be controlled using "free flying" navigation schemes, or alternatively may use tethers to constrain the formation geometry. An investigation has been initiated here to further develop this...
Topics: NASA Technical Reports Server (NTRS), EQUIPMENT SPECIFICATIONS, SPACECRAFT DESIGN, TETHERING,...
The recent announcement of a return to the Moon and a mission to Mars has made the question of human response to lower levels of gravity more important. Recent advances in tether technology spurred by NASA s research in MXER tethers has led to a re-examination of the concept of a variable-gravity research facility (xGRF) for human research in low Earth orbit. Breakthroughs in simplified inertial tracking have made it possible to consider eliminating the despun section of previous designs. This,...
Topics: NASA Technical Reports Server (NTRS), GRAVITATION, RESEARCH FACILITIES, TETHERING, TETHERLINES, LOW...
A report summarizes the design concept of a super miniaturized autonomous reconfigurable technology (SMART) solar sail a proposed deployable, fully autonomous solar sail for use in very fine station keeping of a spacecraft. The SMART solar sail would include a reflective film stretched among nodes of a SMART space frame made partly of nanotubule struts. A microelectromechanical system (MEMS) at each vertex of the frame would spool and unspool nanotubule struts between itself and neighboring...
Topics: NASA Technical Reports Server (NTRS), SMART STRUCTURES, SOLAR SAILS, MICROELECTROMECHANICAL...
202
202
May 22, 2011
05/11
by
Franson, James D
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Several sources of phase noise, including spontaneous emission noise and the loss of coherence due to which-path information, are examined in the classical limit of high field intensities. Although the origin of these effects may appear to be quantum-mechanical in nature, it is found that classical analogies for these effects exist in the form of chaos.
Topics: CENTER OF MASS, VIBRATION DAMPING, CONTROL SYSTEMS DESIGN, POINTING CONTROL SYSTEMS, SATELLITE...
Asteroids and comets exert such a small gravitational force that it is not practical to survey them from orbit. One must instead continuously accelerate using maneuvering rockets to move around the surface. A space exploration craft in three parts connected by lightweight cables can survey asteroids and comets, and deploy landers, without requiring the large thrusters and the continuous depletion of fuel required by a single craft. The spacecraft is deployed by spinning up from a compact...
Topics: NASA Technical Reports Server (NTRS), ASTEROIDS, COMETS, PROTOPLANETS, SPACECRAFT PROPULSION,...
Advanced electric propulsion research activities are currently underway that seek to addresses feasibility issues of a wide range of advanced concepts, and may result in the development of technologies that will enable exciting new missions within our solar system and beyond. Each research activity is described in terms of the present focus and potential future applications. Topics include micro-electric thrusters, electrodynamic tethers, high power plasma thrusters and related applications in...
Topics: NASA Technical Reports Server (NTRS), ELECTRIC PROPULSION, RESEARCH, FEASIBILITY, TETHERLINES,...
The complete documentation of the workshop including all addresses, panel reports, charts, and summaries are presented. This volume presents all the reports on the fundamentals of applications of tethers in space. These applications include electrodynamic interactions, transportation, gravity utilization, constellations, technology and test, and science applications.
Topics: NASA Technical Reports Server (NTRS), ELECTRODYNAMICS, TECHNOLOGY UTILIZATION, TETHERED SATELLITES,...
The Tethered Satellite System has great prospects for extending orbital operations capability of the Space Transportation System to science, applications, and technology projects not otherwise attainable. The system will installed in the Shuttle Orbiter and will have the capability to deploy a captive satellite up to 100 km away from the Orbiter. Control and retrieval of the satellite are accomplished by means of a tether line connecting the satellite and the cargo bay mounted equipment in the...
Topics: NASA Technical Reports Server (NTRS), SATELLITE DESIGN, SPACE SHUTTLE ORBITERS, TETHERED...
A study of the basic equations governing orbital transfers using long orbiting tethers is presented. A very simple approximation to the general transfer equation is derived for the case of short tethers and low eccentricity orbits. Numerical examples are calculated for the case of injection into a circular orbit from a platform in eccentric orbit and injection into eccentric orbit from a platform in circular orbit. For the case of long tethers, a method is derived for reducing tether mass and...
Topics: NASA Technical Reports Server (NTRS), LAUNCHING, ORBITAL MECHANICS, TETHERLINES, TRANSFER ORBITS,...
A mechanical connection system comprises a first body defining a receptable and a second body defining a pin matingly receivable in the receptacle by relative movement in a first directional mode. A primary latch is engagable between the two bodies to retain the pin in the receptacle. The primary latch is reciprocable in a second directional mode transverse to the first directional mode. A lock member carried by one of the bodies is operatively associated with the primary latch and movable,...
Topics: NASA Technical Reports Server (NTRS), CONNECTORS, COUPLINGS, MECHANICAL DEVICES, TOOLS, ACTUATORS,...
We have contributed to the development of the Submillimeter Probe of the Evolution of Cosmic Structure (SPECS) by analyzing various aspects related to the tethers that connect the spacecraft of this space interferometer. We have focused our analysis on key topics as follows: (a) helping in the configuration selection; (b) computing the system eigenfrequencies as a function of baseline length; (c) developing techniques and conceptual design of devices for damping the tether oscillations; (d)...
Topics: NASA Technical Reports Server (NTRS), SUBMILLIMETER WAVES, FAR INFRARED RADIATION, INFRARED...
A general stability analysis of a cable-body system immersed in a fluid stream is presented. The analytical portion of this analysis treats the system as being essentially a cable problem, with the body dynamics giving the end conditions. The mathematical form of the analysis consists of partial differential wave equations, with the end and auxiliary conditions being determined from the body equations of motion. The equations uncouple to give a lateral problem and a longitudinal problem as in...
Topics: NASA Technical Reports Server (NTRS), CABLES (ROPES), FLOW EQUATIONS, FLUID DYNAMICS, TETHERLINES,...
A dynamic model of the Tethered Satellite System (TSS) and of the relevant simulation program, developed in order to provide the dynamic analysis support for the design verification of the subsatellite attitude control, is presented. Special care was spent in the satellite attitude dynamic analysis and the model was specifically conceived to this aim. The way in which the simulation results can be utilized for the verification and testing of the attitude control is also presented.
Topics: NASA Technical Reports Server (NTRS), COMPUTERIZED SIMULATION, SATELLITE ATTITUDE CONTROL, TETHERED...
The proceedings of the conference are presented. The objective was to provide a forum for the discussion of the structure and status of existing computer programs which are used to simulate the dynamics of a variety of tether applications in space. A major topic was different simulation models and the process of validating them. Guidance on future work in these areas was obtained from a panel discussion; the panel was composed of resource and technical managers and dynamic analysts in the...
Topics: NASA Technical Reports Server (NTRS), COMPUTERIZED SIMULATION, ELECTRODYNAMICS, TETHERED...
Several new uses of satellite tethers are discussed, including: (1) using tether extension to reposition a satellite in orbit without fuel expenditure by extending a mass on the end of a tether; (2) using a tether for energy storage to power the satellite during eclipse; and (3) using a tether for eccentricity pumping to correct perturbations in the orbit and as a means of adding energy to the orbit for boosting and orbital transfer.
Topics: NASA Technical Reports Server (NTRS), DEPLOYMENT, RELOCATION, SATELLITE ORBITS, SATELLITE...
A rotary coupling for connecting a driven part to a source of rotary force is described. This device transmits rotary force in one direction only and disengages to permit the driven part to free wheel when the input member is stopped and precludes the backdriving of rotary force from output member to input member. The coupling includes an input member having a splined shaft, a coupling member connected to the splined shaft, and a coaxial output member. The coupling member and the output member...
Topics: NASA Technical Reports Server (NTRS), CLUTCHES, COUPLINGS, ROTATING CYLINDERS, SHAFTS (MACHINE...
No abstract available
Topics: NASA Technical Reports Server (NTRS), NANOSATELLITES, LAUNCH VEHICLES, TETHERLINES, WIRELESS...
NASA is considering the use of tethered satellites to explore regions of the atmosphere inaccessible to spacecraft or high altitude research balloons. This report summarizes the Lockheed Martin Astronautics (LMA) effort for the engineering study team assessment of an Orbiter-based atmospheric tether mission. Lockheed Martin responsibilities included design recommendations for the deployer and tether, as well as tether dynamic analyses for the mission. Three tether configurations were studied...
Topics: NASA Technical Reports Server (NTRS), TETHERED SATELLITES, TETHERING, DESIGN ANALYSIS, SATELLITE...
The analysis of the rotational dynamics of the satellite was focused on the rotational amplitude increase of the satellite, with respect to the tether, during retrieval. The dependence of the rotational amplitude upon the tether tension variation to the power 1/4 was thoroughly investigated. The damping of rotational oscillations achievable by reel control was also quantified while an alternative solution that makes use of a lever arm attached with a universal joint to the satellite was...
Topics: NASA Technical Reports Server (NTRS), ROTATING BODIES, TETHERED SATELLITES, TRANSVERSE OSCILLATION,...
A dual keel space station configuration was used. The Mobility System, created for moving components over one face of the Space Station, makes it possible to use a single tether deployer system for both Orbit Transfer Vehicles (OTV) and Shuttle launches. Deployer concepts ranging from a minimum capability system that can deorbit the Shuttle from a maximum altitude of 370 km to a full capability system that can deploy the OTN with 9,072 kg of payload and using 150 km of tether were designed and...
Topics: NASA Technical Reports Server (NTRS), COST ANALYSIS, SPACE COMMERCIALIZATION, SPACE STATIONS,...
Electrodynamic (Drag) Tether Thrust Principles: a) Uses both solar energy and consumes no propellant. b) Tether's orbital velocity v (approx. 7500 m/s) through North-pointing geomagnetic field B(sub north) (0.18 - 0.32 Gauss) induces voltage (35 - 160 V/km) in tether. c) Return current is through surrounding plasma. d) Current I produces a drag thrust force F on the tether. e) Magnetic force F from current I through insulated tether of length l: F = lI x B(sub north).
Topics: NASA Technical Reports Server (NTRS), TETHERING, THRUST, TETHERLINES, SPACECRAFT PROPULSION,...
The chairman of the Technology Applications in Space Working Group summarizes the technology issues for each of the disciplines in Tethered Satellite Systems. The disciplines are Tether Materials and Configurations, Tether System Dynamic Simulation Capability, Tether System Instrumentation, TAS Program Related Science Instrumentation, Atmospheric/Aerothermodynamic tethered system research, and TAS Discipline Program Accomplishment. To enable these tether applications, design and development...
Topics: NASA Technical Reports Server (NTRS), NASA PROGRAMS, PROJECT MANAGEMENT, RESEARCH AND DEVELOPMENT,...
The results of a Phase 3 study of two Selected Tether Applications in Space (STAIS); deorbit of a Shuttle and launch of an Orbital Transfer Vehicle (OTV), both from the space station using a tether were examined. The study objectives were to: perform a preliminary engineering design, define operational scenarios, develop a common cost model, perform cost benefits analyses, and develop a Work Breakdown Structure (WBS). Key features of the performance analysis were to identify the net increases...
Topics: NASA Technical Reports Server (NTRS), COST ANALYSIS, REQUIREMENTS, SPACE COMMERCIALIZATION, SPACE...
The use is studied of tether systems to improve the lowest possible steady gravity level on the Space Station. Particular emphasis is placed by the microgravity community on the achievement of high quality microgravity conditions. The tether capability is explored for active control of the center of gravity and the analysis of possible tethered configurations.
Topics: NASA Technical Reports Server (NTRS), GRAVITATIONAL EFFECTS, MICROGRAVITY, SPACE STATIONS,...
A team consisting of collaborators from Tennessee Technological University (TTU), Marshall Space Flight Center, BD Systems, and the University of Delaware (herein called the TTU team) conducted specific research and development activities in MXER tether systems during the base period of May 15, 2004 through September 30, 2006 under contract number NNM04AB13C. The team addressed two primary topics related to the MXER tether system: 1) Development of validated high-fidelity dynamic models of an...
Topics: NASA Technical Reports Server (NTRS), DYNAMIC MODELS, TETHERING, SPACECRAFT PROPULSION,...
The 8th Spacecraft Charging Technology Conference was held in Huntsville, Alabama, October 20-24, 2003. Hosted by NASA s Space Environments and Effects (SEE) Program and co-sponsored by the Air Force Research Laboratory (AFRL) and the European Space Agency (ESA), the 2003 conference saw attendance from eleven countries with over 65 oral papers and 18 poster papers. Presentation topics highlighted the latest in spacecraft charging mitigation techniques and on-orbit investigations, including:...
Topics: NASA Technical Reports Server (NTRS), SPACECRAFT CHARGING, EXTERNAL SURFACE CURRENTS, CONFERENCES,...
The Tethers in Space Handbook, Second Edition represents an update to the initial volume issued in September 1986. As originally intended, this handbook is designed to serve as a reference manual for policy makers, program managers, educators, engineers, and scientists alike. It contains information for the uninitiated, providing insight into the fundamental behavior of tethers in space. For those familiar with space tethers, it includes a summary of past and ongoing studies and programs, a...
Topics: NASA Technical Reports Server (NTRS), CONFERENCES, HANDBOOKS, SPACE MISSIONS, TETHERING,...
The potential for collisions or close passes with other space objects presents a significant issue for many space tether applications, representing a potential risk both to the integrity of the tether system and t o the safety of other spacecraft. Potential collisions between tethers and other space objects may be possible to avoid if close encounters can be predicted with sufficient precision and advance notice. In order to provide a method for predicting the frequency with which a tether must...
Topics: NASA Technical Reports Server (NTRS), TETHERING, COLLISIONS, SAFETY, RISK, PREDICTIONS,...
