SPACE ELEVATORS

bugenigmaSoftware and s/w Development

Oct 30, 2013 (4 years and 9 days ago)

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SPACE ELEVATORS

INTRODUCTION

A

space

elevator

is

a

tall

tower

rising

from

a

point

on

the

Earth’s

equator

to

a

height

well

above

the

geostationary

orbit,

where

it

terminates

in

a

counterweight
.

It

is

a

structure

designed

to

transport

material

from

a

celestial

body's

surface

into

space
.



Carbon

nanotubes

are

an

excellent

material

for

the

space

elevator
.

They

are

one

of

the

strongest

materials

in

nature
.



Once

the

first

space

elevator

is

built

the

second

one

and

all

the

others

would

have

the

use

of

the

previous

ones

to

assist

in

construction,

making

their

costs

considerably

cheaper
.



SPACE ELEVATOR

A

space

elevator

is

a

structure

designed

to

transport

material

from

a

celestial

body's

surface

into

space
.

PARTS
:

1.
The

Tether
:

This

is

a

‘cable’

that

stretches

from

the

earth

to

about

1
,
44
,
000

km

into

space
.


Material

used
:

Carbon

Nanotubes

2
.

The

Ground

Station
:

This

serves

to

anchor

the

Tether

to

Earth

and

also

as

the

loading

and

unloading

station
.


It

will

be

located

on

or

very

near

to

the

earth’s

equator
.

3
.

The

Counterweight
:

This

is

a

large

mass

located

at

the

outer

end

of

the

Tether

to

keep

the

Tether

firm
.

4
.

The

Climbers
:

These

are

the

‘elevator

cars’

travelling

up

and

down

the

Tether,

carrying

cargo

and

eventually

humans

into

orbit
.

CONSTRUCTION


Construction

is a process that consists
of

building

or assembling of

infrastructure.


Here, the infrastructure is the Ground
Station, Tether, Counterweight and Climbers.

The best design that can be used is of a
tapered tower with a cross section that varies
with height in such a way that the tension or
force per unit area in the tower remains
uniform along its length and at a value that
can be safely sustained by available
construction materials.


CARBON NANOTUBES

Carbon

Nanotubes

(
CNTs
)

are

allotropes

of

carbon

with

a

cylindrical

nanostructure
.

Nanotubes

have

been

constructed

with

length
-
to
-
diameter

ratio

of

up

to

13
,
20
,
00
,
000
:
1
.

They

are

among

the

stiffest

and

strongest

fibers

known,

and

have

remarkable

electronic

properties

and

also

good

conductors

of

heat
.

They

also

have

many

other

unique

characteristics
.

PROPERTIES
:


Young's

modulus
:

270
-
950

Gpa



Tensile

strength
:

11
-
63

Gpa


Hardness
:

up

to

24
GPa

without

deformation


Density
:

1
.
3
-
1
.
4

g/cm
3

CURRENT STATUS

PROPERTY

REQUIRED

ACHIEVED

YEAR

NOTES

STRENGHT

100,000

KN

7100 KN

2010

House
-
Tether

SPEED




300kmph

66kmph




14kmph

2010




2009

Battery

powered
climber to a distance
of 300m


Beam powered
climber to an altitude
of 1km

ALTITUDE

36000 km

1 km

2009

Speed over 14kmph

ADVANTAGES



DISADVANTAGES


1.
Simple in concept.

2.
Standard technology.

3.
Primary system located on
Earth.

4.
Cost reduction (gradually)

5.
Can be reused.

6.
Allows to carry large pay
load into space


1.
Susceptible to catastrophic
damage.

2.
Requires massive cable.

3.
Passengers have to be
protected from radiation by
shielding, which adds mass
to the climber.


CONCLUSION

Construction

of

a

space

elevator

is

considered

to

be

a

large

project

and

some

advances

in

the

engineering,

manufacturing

and

physical

technology

are

required
.

Recent

design

work

has

illustrated

that

the

concept

of

Space

Elevator

is

feasible

with

current

or

near
-
future

technology
.


Space

elevators

could

lift

material

at

just

one
-
fifth

the

cost

of

a

rocket,

since

most

of

a

rocket's

energy

is

used

simply

to

escape

Earth's

gravity
.

Not

only

could

a

space

elevator

offer

research

expeditions

for

astronauts,

the

technology

could

also

expand

the

possibilities

for

space

tourism

and

even

space

colonization
.


REFERENCES


www
.
physorg
.
com


http
:
//ipn
2
.
epfl
.
ch/CHBU/papers/ourpapers/Salvetat_APA
99
.
pdf


www
.
spaceelevator
.
com


science
.
nasa
.
gov



www
.
pa
.
msu
.
edu


www
.
research
.
ibm
.
com/nanoscience/nanotubes
.
html


www
.
nanocyl
.
com


THANK YOU