RibbonDynamics: Difference between revisions

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== GTOSS ==
= GTOSS Simulation of the Space Elevator =
(Make sure you have mercurial and relevant fortran compilers, etc. installed)
Then type:
hg clone http://hg.sharesource.org/gtoss


== Ribbon Dynamics ==
== 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.


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.  The results of those studies are below.
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]].


{| border="1" style="background:transparent;"
You can learn more about GTOSS's general and detailed attributes at the [http://home.comcast.net/~GTOSS/ GTOSS description web site].
|-
|width="900pt"|'''GTOSS'''


Also see http://home.comcast.net/~GTOSS/GTOSS_and_Space_Elev.html


== Download ==


[[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.
'''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 on GitLab at [https://gitlab.com/keithcu/GTOSS https://gitlab.com/keithcu/GTOSS]


[[Image:Paper_Lang_Aero.pdf ]]: Paper on Aerodynamic Response to Atmospheric Wind (PDF)
Type:


[[image:Paper_Lang_Climber_Transit.pdf ]]: Paper on Dynamic Response to Climber Transits (PDF)
git clone https://gitlab.com/keithcu/GTOSS


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


ATMOSPHERIC WIND RESPONSE  '''(Deflection distances are generally magnified & time is accelerated)'''
''Full User Guides and Reference Manuals'' are located here:
http://keithcu.com/GTOSS%20Reference%20Docs.zip


'''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
== Ribbon Dynamics Simulation ==


[[image:Lang_Movie_Full.avi ]]: AVI movie: Stop-time animation of entire elevator length '''(with horizontal response scale greatly magnified)'''
The space elevator is a challenging dynamics problem, characterized by:


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


WAVE PROPAGATION VIEWED AT RIBBON HIGH ABOVE EARTH '''(Deflection distances are generally magnified & time is accelerated)'''
- A Unique aspect ratio,


Note: this wave originates at the ground in response to a planned base-movement
- A perturbing environment that includes; wind, passing gravity wells, solar wind pressure, solar heating, ascending climbers and a moving anchor.


[[image:Displac_Hi_MEO.mov]]: QUICKTIME movie, Horizontal scale is greatly magnified
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.


Note: the above QT movie was made using the application SpaceAnimator, created by Paul Snow
Some results of those studies are shown below.


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


== Space Elevator Dynamics Handbook ==


'''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.'''
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:''' [[Image:Dyn_HB_Sec_1.pdf]] Basic Elevator Dynamics Facts, Physical Attributes, Useful Formulas, etc.
 
'''Sec 2:''' [[Image:Dyn_HB_Sec_2.pdf]] General Dynamic Behavior.
 
'''Sec 3 & 4:''' [[Image:Dyn_HB_Sec_3+4.pdf]] Debris Avoidance (not finished);  Aerodynamic Response.
 
'''Sec 5, 6 & 7:''' [[Image:Dyn_HB_Sec_5+6+7.pdf]] Climber Dynamics; Construction; Failure Modes.
 
'''Sec X:''' [[Image: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)''
[[Image: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) ==
[[image:Paper_Lang_Aero.pdf ]]
 
See '''''animations''''' pertaining to [[Aerodynamic Response]]
 
== Paper on Dynamic Response to Climber Transits (PDF) ==
[[image:Paper_Lang_Climber_Transit.pdf ]]
 
See '''''animations''''' pertaining to [[Climber Dynamics Response]]
 
== 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'''
 
[[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

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