Thread Rating:
  • 0 Vote(s) - 0 Average
  • 1
  • 2
  • 3
  • 4
  • 5
Electro Dynamic Tether
Post: #1

Electro Dynamic Tether

Tether is a word, which is not heard often. The word meaning of tether is 'a rope or chain to fasten an animal so that it can graze within a certain limited area'. We can see animals like cows and goats 'tethered' to trees and posts.

In space also tethers have an application similar to their word meaning. But instead of animals, there are spacecrafts and satellites in space. A tether if connected between two spacecrafts (one having smaller orbital altitude and the other at a larger orbital altitude) momentum exchange can take place between them. Then the tether is called momentum exchange space tether. A tether is deployed by pushing one object up or down from the other. The gravitational and centrifugal forces balance each other at the center of mass. Then what happens is that the lower satellite, which orbits faster, tows its companion along like an orbital water skier. The outer satellite thereby gains momentum at the expense of the lower one, causing its orbit to expand and that of the lower to contract. This was the original use of tethers.
But now tethers are being made of electrically conducting materials like aluminium or copper and they provide additional advantages. Electrodynamic tethers, as they are called, can convert orbital energy into electrical energy. It works on the principle of electromagnetic induction. This can be used for power generation. Also when the conductor moves through a magnetic field, charged particles experience an electromagnetic force perpendicular to both the direction of motion and field. This can be used for orbit raising and lowering and debris removal. Another application of tethers discussed here is artificial gravity inside spacecrafts.

Space tethers have been studied theoretically since early in the 20th century, it wasn't until 1974 that Guiseppe Colombo came up with the idea of using a long tether to support satellite from an orbiting platform. But that was simple momentum exchange space tether. Now lets see what made scientists think of electrodynamic tethers.
Every spacecraft on every mission has to carry all the energy sources required to get its job done, typically in the form of chemical propellants, photovoltaic arrays or nuclear reactors. The sole alternative - delivery service - can be very expensive. For example, a spacecraft orbiting in the International space Station (ISS) will need an estimated 77 metric tons of booster propellant over its anticipated 10 year life span just to keep itself from gradually falling out of orbit. Assuming a minimal price of $7000 a pound (dirt cheap by current standards) to get fuel up to the station's 360 km altitude, i.e. $1.2 billion simply to maintain the orbital status quo.

So scientists have are taking a new look at space tether, making it electrically conductive. In 1996, NASA launched a shuttle to deploy a satellite on a tether to study the electrodynamic effects of a conducting tether as it passes through the earth's magnetic fields. As predicted by the laws of electromagnetism, a current was produced in the tether as it passed through the earth's magnetic field, acting as an electrical generator. This was the origin of electrodynamic tethers

Important Note..!

If you are not satisfied with above reply ,..Please


So that we will collect data for you and will made reply to the request....OR try below "QUICK REPLY" box to add a reply to this page
Popular Searches: electro dynamic induction, electrodynamic tether, electrodynamic tether advantage, electrodynamic tether sweeminar and ppt download, shuttle electrodynamic tether, electrodynamic tether propulsion demonstration mission, electrodynamic tether report,

Quick Reply
Type your reply to this message here.

Image Verification
Image Verification
(case insensitive)
Please enter the text within the image on the left in to the text box below. This process is used to prevent automated posts.

Possibly Related Threads...
Thread: Author Replies: Views: Last Post
  electrodynamic tether full report project reporter 4 5,752 12-11-2012 03:52 PM
Last Post: seminar details
Last Post: ravikumar.r
  Sony Dynamic Digital Sound project topics 2 1,021 01-10-2011 09:48 AM
Last Post: seminar addict
  Micro Electro Mechanical Systems in biomedical industry project topics 1 1,827 10-05-2011 11:30 AM
Last Post: project topics
  Dynamic Physical Rendering-CLAYTRONICS seminar class 1 1,219 08-05-2011 03:17 PM
Last Post: darksign
  Low Power Consumption Using Dynamic Voltage Frequency Scaling[DVFS] seminar class 0 1,071 28-03-2011 04:42 PM
Last Post: seminar class
  DYNAMIC VIDEO SYNOPSIS Wifi 0 707 30-10-2010 09:37 AM
Last Post: Wifi
  synchronisation in laser devices with electro-optical feedback Wifi 0 434 16-10-2010 12:34 AM
Last Post: Wifi
  Dynamic Power Management for Embedded Systems full report computer science topics 0 1,245 09-06-2010 05:27 PM
Last Post: computer science topics
  Hybrid Integration of Light Emitters and Detectors with SOI Based Micro-Opto-Electro project topics 0 566 26-04-2010 09:34 AM
Last Post: project topics