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


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. You can learn more about GTOSS's general attributes at the [http://home.comcast.net/~GTOSS/ GTOSS description web site].
== Overview ==


DOWNLOAD
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.  
The code is made available via a source sharing facility "sharesource.com" 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),


Type:
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]].


hg clone http://hg.sharesource.org/gtoss
You can learn more about GTOSS's general and detailed attributes at the [http://home.comcast.net/~GTOSS/ GTOSS description web site].


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 ==
== Download ==
Getting started documentation is here:
[[Image:Getting_Started_with_GTOSS.pdf]]


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


== Ribbon Dynamics ==
The GTOSS source code is made available on GitLab at [https://gitlab.com/keithcu/GTOSS https://gitlab.com/keithcu/GTOSS]


Type:


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.
  git clone https://gitlab.com/keithcu/GTOSS


{| border="1" style="background:transparent;"
Note: Inside the "SE Dynamics Exploration Runs" ''directory'' there are 35 GTOSS input-run streams that produce a wide variety of space elevator analyses.
|-
|width="900pt"|'''GENERAL GTOSS SIMULATION RESULTS'''


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


A HANDBOOK OF VARIOUS DYNAMIC ATTRIBUTES OF THE SPACE ELEVATOR
''Full User Guides and Reference Manuals'' are located here:
http://keithcu.com/GTOSS%20Reference%20Docs.zip


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.


[[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.
== Ribbon Dynamics Simulation ==


Also see http://home.comcast.net/~GTOSS/GTOSS_and_Space_Elev.html
The space elevator is a challenging dynamics problem, characterized by:


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


'''SELECTED GTOSS SIMULATION ANIMATIONS'''
- A Unique aspect ratio,


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


'''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.


Some results of those studies are shown below.




SELECTED ATMOSPHERIC WIND RESPONSE ANIMATIONS
== Space Elevator Dynamics Handbook ==


'''NOTE: these winds are very high, and are not typical of the space elevator geographical location'''
This handbook covers many of the dynamic attributes and responses of the space elevator (note: in addition, the papers listed in the next section also expand upon and extend the contents of the handbook).


[[image:Lang_Movie_Low.avi ]]: AVI movie: Stop-time animation with Low altitude view and atmospheric density depiction
The complete handbook is a 150 page, 10.2 MB, PDF document; In addition, it has been sub-dividied for ease of download and access for those so preferring.


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


'''Sec 1:''' [[Image:Dyn_HB_Sec_1.pdf]] Basic Elevator Dynamics Facts, Physical Attributes, Useful Formulas, etc.


SELECTED WAVE PROPAGATION ANIMATIONS VIEWED AT RIBBON HIGH ABOVE EARTH
'''Sec 2:''' [[Image:Dyn_HB_Sec_2.pdf]] General Dynamic Behavior.


'''NOTE: this wave originates at the ground in response to a planned base-movement'''
'''Sec 3 & 4:''' [[Image:Dyn_HB_Sec_3+4.pdf]] Debris Avoidance (not finished);  Aerodynamic Response.


[[image:Displac_Hi_MEO.mov]]: QUICKTIME movie, Horizontal scale is greatly magnified
'''Sec 5, 6 & 7:''' [[Image:Dyn_HB_Sec_5+6+7.pdf]] Climber Dynamics; Construction; Failure Modes.


Note: the above QT movie was made using the application SpaceAnimator, created by Paul Snow
'''Sec X:''' [[Image:Dyn_HB_Appendix.pdf]] Appendices and references.


(you can contact Paul in the Seattle area at "psnow10@comcast.net", phone: 425 466-1405)


'''Dynamics Handbook as a Single Download'''
'' for those who want to download the entire handbook in one operation, rather than by sub-sections (per above)''
[[Image:Dyn_HB_Final_pdf.pdf]]:


= 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 specifically related each paper's subject; these animations will clarify, supplement and expand upon the contents of each paper.


Note: Following each paper below is a link to a page that presents many animations of GTOSS simulations pertaining to the subject of each paper.
== Paper on Aerodynamic Response to Atmospheric Wind (PDF) ==
[[image:Paper_Lang_Aero.pdf ]]


SPACE ELEVATOR PAPERS and ILLUSTRATIVE ANIMATIONS PERTAINING THERETO
See '''''animations''''' pertaining to [[Aerodynamic Response]]


[[image:Paper_Lang_Aero.pdf ]]: Paper on Aerodynamic Response to Atmospheric Wind (PDF)
== Paper on Dynamic Response to Climber Transits (PDF) ==
[[image:Paper_Lang_Climber_Transit.pdf ]]


[[image:Paper_Lang_Climber_Transit.pdf ]]: Paper on Dynamic Response to Climber Transits (PDF)
See '''''animations''''' pertaining to [[Climber Dynamics Response]]


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


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




= Selected GTOSS Simulation Animations =


== 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 Brad Edwards at brad_edwards@yahoo.com.  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]]
|}

Latest revision as of 05:30, 6 June 2018

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 on GitLab at https://gitlab.com/keithcu/GTOSS

Type:

git clone https://gitlab.com/keithcu/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 in the next section also expand upon and extend the contents of the handbook).

The complete handbook is a 150 page, 10.2 MB, PDF document; In addition, it has been sub-dividied for ease of download and access for those so preferring.


Sec 1: File:Dyn HB Sec 1.pdf Basic Elevator Dynamics Facts, Physical Attributes, Useful Formulas, etc.

Sec 2: File:Dyn HB Sec 2.pdf General Dynamic Behavior.

Sec 3 & 4: File:Dyn HB Sec 3+4.pdf Debris Avoidance (not finished); Aerodynamic Response.

Sec 5, 6 & 7: File:Dyn HB Sec 5+6+7.pdf Climber Dynamics; Construction; Failure Modes.

Sec X: File:Dyn HB Appendix.pdf Appendices and references.


Dynamics Handbook as a Single Download for those who want to download the entire handbook in one operation, rather than by sub-sections (per above) File:Dyn HB Final pdf.pdf:

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

Wave Propagation Animations

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

Wave Propagation Animations