space elevators the green way to outer space. elevator car bottom pulley top pulley cable normal...
TRANSCRIPT
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Space Elevators
The Green Way to Outer Space
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Elevator car
Bottom pulley
Top pulley
Cable
Normal elevator Construction
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Cable to Space Station
Cable from Space Station
Clamp
Elevator Car
Clamp
Pulley Space Elevator base
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A moving belt space elevator compared to one with climbers
1. Ten times the cargo throughput2. Six times the energy efficiency3. Almost zero net energy for passenger travel
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Two SE Design Scenarios
1. Strong tether material – Specific strength more than 50 x 106 N-m/kg
2. Weak tether material – Specific strength less than 20 x 106 N-m/kg.
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Single cable as Counterwieght
Upper pulley Moving cables for off-planet launches
Space station at GEO Moving cables for lifting elevator cars from earth Base station on Earth
Strong tetherDesign
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42.2 Mm GEO Station
11x Cable load 19.3 x 106
18 Mm 6x Cable load 19.3 x 106
11.1 Mm 2x Cable load 18.1 x 106
8.7 Mm 1x Cable load 16.6 x 106
6.4 Mm
Weaker cable Design
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Transfer pulleys between loops
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Elevator car passing over pulleys
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Cable reel Extendable frame Cable reel Load to earth Motor Motor Counterweight
Construction Satellite
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Orbital Energy and Angular Momentum
Rotational Energy and Angular Momentum
GEOGEO
EarthEarth
Energy considerations in constructing a space elevator
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Counterweight
Construction Satellite Geostationary Orbit
Splice Earth
Cable reel
Feeding out cablefrom the ground
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Pull of single cable
SE pulley
Coriolis force
Cable attached Reel of to ground cable
Raising the SE loopswith their pulleys
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Upper pulley
Space station at GEO Base station on Earth
Finished Space Elevator
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GEO Station
Earth
Feeding out cables for multi-loop SE
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Clamp Cable wrapped around capstan to releave tension on rising cable.
Reel of Cable Earth
Cable feeding details
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Tapered SEunder construction
Reel of cable unwinding over existing tether
New addition of cable
Constructing a tapered SE
GEO
Earth
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Advantages of a Space Elevator With Moving Cables
•Lower cost of construction•Faster construction•Lower cost of operation•Much higher throughput•Shorter time to space•Minimizes radiation exposure•No movable base station•Easier maintenance
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Costs for constructing the first Space Elevator:
Materials . . . . . . . . . . . . . . . . . . . . . . . . . . .$300MRocket launch to GEO . . . . . . . . . . . . . . . . . $150MInitial seed satellite . . . . . . . . . . . . . . . . . . $100MBase station . . . . . . . . . . . . . . . . . . . . . . . . $100MLabor and overhead . . . . . . . . . . . . . . . . . . $100MSpace station skeleton and elevator cars . $150MAdditional design and engineering costs . . $50M
Total cost . . . . . . . . . . . . . . . . . . . . . . $950M
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Space Elevator Station In Synchronous Orbit
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Counterweight
Load to Mars
25,000 km
Geosynchronous Orbit Rotation of the Earth Earth
Slinging a load to Mars from the SE
Load on the SE at the release point is only 1/40th g.
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Complete Colony En route to Mars
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Space Elevator
Earth Moon
L1 Point
Zero relative velocity transfer point
Lunar Space Elevator
Lunar Space Elevator Relationships
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The papers with the details of this presentation are available at my website:
www.techonomics.biz
(In the ABOUT page)