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THE SPACE ELEVATOR. Aaditya Sapkal (ES12B1016). The Components. The Ribbon The Anchors The Climbers The Power. The Ribbon: Design. The Ribbon: Construction. Initial production takes place on earth

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the space elevator

THE SPACE ELEVATOR

AadityaSapkal

(ES12B1016)

the components
The Components
  • The Ribbon
  • The Anchors
  • The Climbers
  • The Power
the ribbon construction
The Ribbon: Construction
  • Initial production takes place on earth
  • Aligned nanotubes are epoxyed into sheets, which are then combined (reinforced)
  • Climbers have a similar system on-board to build tether
the anchors
The Anchors
  • The space anchor will consist of the spent launch vehicle
  • The Earth anchor will consist of a mobile sea platform 1500 miles from the Galapagos islands
the climbers
The Climbers
    • Initial ~200 climbers used to build nano-ribbon
  • Later used as launch vehicles for payloads from 20,000- 1,000,000 kg, at velocities up to 200km/hr
  • Climbers powered by electron laser & photovoltaic cells, with power requirements of 1.4-120MW
the power
The Power
  • Free-electron lasers used to deliver power
  • Adaptive Optics on Hobby-Eberly telescope used to focus Earth-based beams, (25cm spot @ 1,000km altitude)
  • Reduced power delivered at high altitudes compensated by reduced gravitational force on climber, (~0.1g)
major hurdles
Major Hurdles
  • Ribbon Construction
  • Atmospheric:
        • Lightning
        • High Winds
        • Atomic Oxygen
  • Orbital:
          • Meteors
          • Low orbit object
  • Ribbon Breakage
sufficient ribbons
Sufficient Ribbons

Problems:

Solutions:

Nanotubes must be defect free and straight

The epoxy must be strong yet flexible, burn up at a several hundred Kelvin, and cure relatively quickly

The length of the finished cable is 91,000km, and nanotubes are cm in length

Large scale behavior of nanotubes unknown

Nanotubes are grown aligned, and defects can be controlled in current production methods, (spark gap)

The ribbon can be produced in small length bundles and then connected

atmospheric oxygen 60 100km
Atmospheric Oxygen 60-100km

Threat:

Solution:

Extremely corrosive, will etch ribbon epoxy and possibly nanotubes

Coat ribbon with Gold or Aluminum which have resisted etching in these atmospheric conditions,(NASA’s Long Duration Exposure Facility

low orbit objects 500 1700km
Low Orbit Objects 500-1700km

Threat:

  • 108,000 (>1cm) objects with enough velocity to sever or critically damage tether. Strikes could occur ~every 14 hours

Solution:

  • Tracking systems for objects >10cm already in place, sea platform will move tether to avoid
  • Tracking systems for 1-10cm objects coming on-line
lightning
Lightning

Threat:

  • Ribbon has lower resistivity than surrounding air, lighting will prefer this path.

Solutions:

  • Platform lies in a region of very low lightning activity
  • Platform is mobile, and can move tether out of the way of incoming storms
high winds
High Winds

Threat:

  • 32m/s wind velocity will induce enough drag to destroy tether

Solution:

  • Winds at platform location consistently below critical velocity
  • Width of tether will be adjusted to minimize wind loading
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