Difference between revisions of "RibbonDynamics"

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= GTOSS =
= GTOSS Simulation of the Space Elevator =
 
== Overview ==


GTOSS is a tether simulation code developed by David Lang to study the dynamics of a wide variety of tethered object configurations, both terrestrial and in space. This code was first used for flight certification of the Shuttle TSS experiments, and is capable of simulating many aspects of the space elevator system dynamics. The source has been made freely available to those interested and capable of pursuing similar studies.  
GTOSS is a tether simulation code developed by David Lang to study the dynamics of a wide variety of tethered object configurations, both terrestrial and in space. This code was first used for flight certification of the Shuttle TSS experiments, and is capable of simulating many aspects of the space elevator system dynamics. The source has been made freely available to those interested and capable of pursuing similar studies.  
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You can learn more about GTOSS's general and detailed attributes at the [http://home.comcast.net/~GTOSS/ GTOSS description web site].
You can learn more about GTOSS's general and detailed attributes at the [http://home.comcast.net/~GTOSS/ GTOSS description web site].


== Download ==
== Download ==
The code is made available via a source sharing facility http://sharesource.org and is based on the Mercurial source management software system; Make sure you have Mercurial and relevant fortran compilers, etc. installed. Using a Unix or Linux type shell-terminal interface (say "Terminal" on Mac OSX or Ubuntu, etc),  
 
'''Those interested in working with GTOSS please contact [mailto:seattledl@comcast.net David Lang]. The GTOSS program is being made available to individuals with the background knowledge to use it.  The code is large and extremely complex as are the engineering input parameters and interpretation of the output results.'''
 
The GTOSS source code is made available via a source sharing facility http://sharesource.org and is based on the Mercurial source management software system; Make sure you have Mercurial and relevant fortran compilers, etc. installed. Using a Unix or Linux type shell-terminal interface (for instance, "Terminal" on Mac OSX or Ubuntu, etc),  


Type:
Type:
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hg clone http://hg.sharesource.org/gtoss
hg clone http://hg.sharesource.org/gtoss


Note: Inside the "SE Dynamics Exploration Runs" directory there are 35 GTOSS input-run streams that produce a wide variety of space elevator analyses.
Note: Inside the "SE Dynamics Exploration Runs" ''directory'' there are 35 GTOSS input-run streams that produce a wide variety of space elevator analyses.
 


== GTOSS Documentation ==
== GTOSS Documentation ==
Getting started documentation is here:
 
''Getting Started'' documentation is here:
[[Image:Getting_Started_with_GTOSS.pdf]]
[[Image:Getting_Started_with_GTOSS.pdf]]


Full Docs are located here:
''Full User Guides and Reference Manuals'' are located here:
http://keithcu.com/GTOSS%20Reference%20Docs.zip
http://keithcu.com/GTOSS%20Reference%20Docs.zip


== Ribbon Dynamics ==
The space elevator is a challenging dynamics problem.  It reaches through a gravity well, has a very unique aspect ratio, is in an environment with wind, passing gravity wells, solar wind pressure, ascending climbers and a moving anchor.  An extensive study was undertaken by David Lang to simulate the system from deployment through operation.  Some results of those studies are shown below.


== General GTOSS Simulation Results ==
== Ribbon Dynamics Simulation ==
== A Handbook of Various Dynamic Attributes of the Space Elevator ==


This handbook covers many of the dynamic attributes and responses of the space elevator, however the papers listed below, also expand upon and extend the contents of the handbook.
The space elevator is a challenging dynamics problem, characterized by:


[[Image:Dyn_HB_Final_pdf.pdf]]: Large compilation of David Lang's Space Elevator dynamics work. (10.2Meg PDF) - This document will be split and referenced.
- A topology that spans a significant portion of a ''gravity-well'',


Also see http://home.comcast.net/~GTOSS/GTOSS_and_Space_Elev.html
- A Unique aspect ratio,


= Selected GTOSS Simulation Animations =
- A perturbing environment that includes; wind, passing gravity wells, solar wind pressure, solar heating, ascending climbers and a moving anchor.
The animations shown below represent but a few examples that typify the larger body of GTOSS space elevator work that has been done. Following these is a list of papers which includes a more extensive selection of animations pertaining to, and elucidating on, the specific subject matter of each paper.


'''Important Note: In ALL animations below, Deflection-Distances are generally MAGNIFIED & time is ACCELERATED'''
An extensive study was undertaken by David Lang using GTOSS to simulate space elevator dynamics from deployment through operation. These studies have resulted in ''Papers'', a Space Elevator Dynamics Handbook, and numerous illustrative engineering animations of GTOSS simulated dynamic behaviors.


== Selected Atmospheric Wind Response Animations ==
Some results of those studies are shown below.
'''NOTE: these winds are very high, and are not typical of the space elevator geographical location'''


[[image:Lang_Movie_Low.avi ]]: AVI movie: Stop-time animation with Low altitude view and atmospheric density depiction


[[image:Lang_Movie_Full.avi ]]: AVI movie: Stop-time animation of entire elevator length '''(with horizontal response scale greatly magnified)'''
== Space Elevator Dynamics Handbook ==


== Selected Wave Propagation Animations Viewed at Ribbon High Above Earth ==
This handbook covers many of the dynamic attributes and responses of the space elevator (note: in addition, the papers listed below also expand upon and extend the contents of the handbook).
'''NOTE: this wave originates at the ground in response to a planned base-movement'''


[[image:Displac_Hi_MEO.mov]]: QUICKTIME movie, Horizontal scale is greatly magnified
[[Image:Dyn_HB_Final_pdf.pdf]]: Large compilation of David Lang's Space Elevator dynamics work. (10.2Meg PDF) - This large document will soon be segmented and referenced.


''Note: the above QT movie was made using the application SpaceAnimator, created by Paul Snow''


''(you can contact Paul in the Seattle area at "psnow10@comcast.net", phone: 425 466-1405)''
= Papers and Related Explanatory Animations =
= Papers and Related Explanatory Animations =
Note: Following each paper below is a link to a page that presents animations of GTOSS simulations of the paper's subject; these animations will clarify, supplement and expand upon the contents of each paper.


1. Paper on Aerodynamic Response to Atmospheric Wind (PDF) [[image:Paper_Lang_Aero.pdf ]]  
Note: Following each paper below is a link to a page that presents animations of GTOSS simulations specifically related each paper's subject; these animations will clarify, supplement and expand upon the contents of each paper.
 
== Paper on Aerodynamic Response to Atmospheric Wind (PDF) ==
[[image:Paper_Lang_Aero.pdf ]]  


See '''''animations''''' pertaining to [[Aerodynamic Response]]
See '''''animations''''' pertaining to [[Aerodynamic Response]]


 
== Paper on Dynamic Response to Climber Transits (PDF) ==
2. Paper on Dynamic Response to Climber Transits (PDF) [[image:Paper_Lang_Climber_Transit.pdf ]]
[[image:Paper_Lang_Climber_Transit.pdf ]]


See '''''animations''''' pertaining to [[Climber Dynamics Response]]
See '''''animations''''' pertaining to [[Climber Dynamics Response]]


== Paper on GEO-Based Construction Deployment Dynamics (PDF) ==
[[image:Paper_Lang_GEO_Deploy.pdf ]]


3. Paper on the Dynamics of GEO-Based Construction Deployment (PDF) [[image:Paper_Lang_GEO_Deploy.pdf ]]
See '''''animations''''' pertaining to [[Construction Deployment]]


See '''''animations''''' pertaining to [[Construction Deployment]]


= Selected GTOSS Simulation Animations =


== Selected Wave Propagation Animations ==
'''Many aspects of the propagation of transverse (ie horizontal) waves along the space elevator ribbon are presented here'''


'''For those interested in working with GTOSS please contact [mailto:seattledl@comcast.net David Lang].  The GTOSS program is being added to this site and will be made available to individuals with the background knowledge to use it.  The code is extremely complex as are the input parameters and interpretation of the output results.'''
[[Wave Propagation Animations]]

Revision as of 21:40, 23 December 2008

GTOSS Simulation of the Space Elevator

Overview

GTOSS is a tether simulation code developed by David Lang to study the dynamics of a wide variety of tethered object configurations, both terrestrial and in space. This code was first used for flight certification of the Shuttle TSS experiments, and is capable of simulating many aspects of the space elevator system dynamics. The source has been made freely available to those interested and capable of pursuing similar studies.

GTOSS addresses most of the unique space elevator dynamics attributes. An enumeration of these challenges and how GTOSS addresses them is found at Space Elevator Dynamic Challenges.

You can learn more about GTOSS's general and detailed attributes at the GTOSS description web site.


Download

Those interested in working with GTOSS please contact David Lang. The GTOSS program is being made available to individuals with the background knowledge to use it. The code is large and extremely complex as are the engineering input parameters and interpretation of the output results.

The GTOSS source code is made available via a source sharing facility http://sharesource.org and is based on the Mercurial source management software system; Make sure you have Mercurial and relevant fortran compilers, etc. installed. Using a Unix or Linux type shell-terminal interface (for instance, "Terminal" on Mac OSX or Ubuntu, etc),

Type:

hg clone http://hg.sharesource.org/gtoss

Note: Inside the "SE Dynamics Exploration Runs" directory there are 35 GTOSS input-run streams that produce a wide variety of space elevator analyses.


GTOSS Documentation

Getting Started documentation is here: File:Getting Started with GTOSS.pdf

Full User Guides and Reference Manuals are located here: http://keithcu.com/GTOSS%20Reference%20Docs.zip


Ribbon Dynamics Simulation

The space elevator is a challenging dynamics problem, characterized by:

- A topology that spans a significant portion of a gravity-well,

- A Unique aspect ratio,

- A perturbing environment that includes; wind, passing gravity wells, solar wind pressure, solar heating, ascending climbers and a moving anchor.

An extensive study was undertaken by David Lang using GTOSS to simulate space elevator dynamics from deployment through operation. These studies have resulted in Papers, a Space Elevator Dynamics Handbook, and numerous illustrative engineering animations of GTOSS simulated dynamic behaviors.

Some results of those studies are shown below.


Space Elevator Dynamics Handbook

This handbook covers many of the dynamic attributes and responses of the space elevator (note: in addition, the papers listed below also expand upon and extend the contents of the handbook).

File:Dyn HB Final pdf.pdf: Large compilation of David Lang's Space Elevator dynamics work. (10.2Meg PDF) - This large document will soon be segmented and referenced.


Papers and Related Explanatory Animations

Note: Following each paper below is a link to a page that presents animations of GTOSS simulations specifically related each paper's subject; these animations will clarify, supplement and expand upon the contents of each paper.

Paper on Aerodynamic Response to Atmospheric Wind (PDF)

File:Paper Lang Aero.pdf

See animations pertaining to Aerodynamic Response

Paper on Dynamic Response to Climber Transits (PDF)

File:Paper Lang Climber Transit.pdf

See animations pertaining to Climber Dynamics Response

Paper on GEO-Based Construction Deployment Dynamics (PDF)

File:Paper Lang GEO Deploy.pdf

See animations pertaining to Construction Deployment


Selected GTOSS Simulation Animations

Selected Wave Propagation Animations

Many aspects of the propagation of transverse (ie horizontal) waves along the space elevator ribbon are presented here

Wave Propagation Animations