2 edition of Electrodynamic Tether System Study found in the catalog.
Electrodynamic Tether System Study
|Statement||Prepared by: Ball Aerospace Systems Division.|
|Series||NASA contractor report -- 172024., NASA contractor report -- NASA CR-172024.|
|Contributions||United States. National Aeronautics and Space Administration.|
|The Physical Object|
Brad Edwards for his Space Elevator may detect and suppress most vibrations by changing speed and direction. Thermionic cathode TC [ edit ] Main article: Hot cathode Thermionic emission is the flow of electrons from a heated charged metal or metal oxide surface, caused by thermal vibrational energy overcoming the work function electrostatic forces holding electrons to the surface. Hoffman Ph. The TSS-1R mission was to conduct exploratory experiments in space plasma physics. Findings of the board, included in a page document, identified primary causes which accounted for the tether break during deployment of the Tethered Satellite.
The total experiment lasted approximately seven hours. Electrodynamic tethers can be stabilized by reducing their current when it would feed the oscillations, and increasing it when it opposes oscillations. Approximately 27 hours after deployment, the crew will activate the 5 horsepower electric motor that will rewind the tether and draw the satellite back to the top of the satellite support structure in the payload bay. In our previous studies we modeled the friction force as a function of deployment velocity, but the result showed wide variability, and more accurate estimates were required. Over a few weeks, electrodynamic tethers in Earth orbit might build up vibrations in many modes, as their orbit interacts with irregularities in magnetic and gravitational fields.
However, there is a way to turn this "bug" into a feature. Inside this category of objects we include used upper stages from rockets, non-functional satellites and fragments coming from different spacecraft manoeuvres, explosions, collisions, etc. As a result of power extraction, an electrodynamic tether satellite system loses altitude and deorbits. In Gerald H.
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The Shuttle Electrodynamic Tether System SETS will provide measurements of the tether voltage and current and generate an electron beam in support of science investigations. Other investigations will study the effects of the deployed tether and satellite on the space environment.
The hollow cathode was able to provide a low—power way of connecting the current to and from the Electrodynamic Tether System Study book plasma. Further discussion of this topic can be found. One objective of this program was to demonstrate possible technology for de-orbiting space debris.
The tether was an easy naked eye object when lit by the sun and viewed against a dark sky. The three experiments were the first successful flights of long tethers in orbit, and demonstrated both mechanical and electrodynamic tether operation.
For our theory on these "UFO's" see here. The one ton climber proposed by Dr. Work has been accomplished on current collection using porous spheres, by Stone et al. It is intended to be able to raise or lower the orbit by several kilometers per day, change libration state, change orbit plane, and actively maneuver.
The break was attributed to an electrical discharge through a broken place in the insulation. Another proposed method is to use spinning electrodynamic tethers instead of hanging tethers. This means that the orbiting body is traveling faster than the ions and slower than the electrons, or at a mesosonic speed.
The thermionic emission current density, J, rises rapidly with increasing temperature, releasing a significant Electrodynamic Tether System Study book of electrons into Electrodynamic Tether System Study book vacuum near the surface.
A Space tether consists on a long cable that is used to couple two spacecraft together, which enables the transfer of energy and momentum between them, thus producing a form of Space propulsion. The satellite was designed by a team from Shizuoka University.
The quantitative relation is given in Electrodynamic Tether System Study book equation J. Excerpt The tether was designed to carry up to 15, volts DC and handle tensile forces of up to pounds newtons.
The payload returned data for 8 hours until its battery died; during this time tether torque spun it up to 4 rpm. The Deployer Core Equipment DCORE instrument in the payload bay will control this flow of electrical current in the tether with two electron generator assemblies.
All of the theory presented is used towards developing a current collection model to account for all conditions encountered during an EDT mission. The tether swung to the vertical and was cut after one orbit.
Tether geometries outside this dimension have been addressed. The tether broke in July The voltage of the collecting structure with respect to the ambient plasma, as well as the ambient plasma density and temperature, determines the size of the sheath.
Main article: yo-yo de-spin Short tether systems are commonly used on satellites and robotic space probes. This story is a poignant tale of what might have been in the last century of American space travel.
Electrodynamic tethers have been inspiring aerospace engineers for many years, as they could be used for a broad range of applications like upper atmosphere probes, spacecraft orbit control, planetary exploration, auxiliary power generation, radiation mitigation, etc.Electrodynamic Tether System Study Final Report NM 1.O INTRODUCTION This report covers the results from the Elcctrodynamic Tether System (ETS) Study through August The purpose of this program is to define an ETS that could be erected from the Space Station and/or Plat- forms to function as an energy storage device.
MECHANISMS AND LUBRICATION OF ELECTRODYNAMIC TETHER SYSTEM FOR DEBRIS REMOVAL A demonstration of electrodynamic tethers (EDT) has been planned as means of an active removing space The system will use a tether comprising three stranded wires woven in a net structure as shown in Fig.
2. Each. About. The Penn State Department of Aerospace Engineering, established in and the only aerospace engineering department in Pennsylvania, is consistently recognized as one of the top aerospace engineering departments in the nation, and is also an international leader in aerospace education, research, and engagement.Theory and Experimental Evaluation of Electrodynamic Tether Systems pdf Related Technologies.
by. Keith R. P. Fuhrhop. A dissertation submitted in partial fulfillment. of the requirements for the degree of. Doctor of Philosophy (Electrical Engineering) In The University of Michigan.
Doctoral Committee: Professor Brian E. Gilchrist.change orbit. We also present progress on the Miniature Tether Electrodynamics Experiment (MiTEE), currently in development.
The goal of MiTEE will be to demonstrate miniature electrodynamic tether capabilities in space and study the fundamental dynamics and electrodynamics of .Ebook Brief Ebook of Electrodynamic Tethers. Authors; Authors and affiliations; Thus a spacecraft can use an electrodynamic tether system as a pure power generator (with a small rocket to periodically make-up for the drag), as a pure thruster, or in a combination of both roles.
“Engineering Study of the Electrodynamic Tether as a Cited by: 5.