a major step to efficient trajectory simulation and optimization
a major step to efficient trajectory simulation and optimization
a major step to efficient trajectory simulation and optimization
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As<strong>to</strong>s<br />
Solutions<br />
A Major<br />
Step<br />
<strong>to</strong> Efficient<br />
Trajec<strong>to</strong>ry<br />
Simulation<br />
<strong>and</strong> Optimization<br />
Astrodynamics Workshop 2006<br />
Dipl.-Ing. Sven Weikert<br />
ASTOS Solutions GmbH i.Gr.
Content<br />
As<strong>to</strong>s<br />
Solutions<br />
1. What is ASTOS<br />
2. His<strong>to</strong>ry of ASTOS<br />
3. What is new in ASTOS V6
What is ASTOS<br />
As<strong>to</strong>s<br />
Solutions<br />
ASTOS is an abbreviation for<br />
Aerospace Trajec<strong>to</strong>ry Optimization Software<br />
Graphical User Interface<br />
Optimization Methods<br />
PROMIS<br />
TROPIC<br />
CAMTOS<br />
CGA<br />
SOCS<br />
ASTOS<br />
Model Library
ASTOS Capabilities<br />
As<strong>to</strong>s<br />
Solutions<br />
• Performance evaluations of specific launch <strong>and</strong><br />
reentry vehicles (payload maximization, fuel<br />
allocation, etc.)<br />
• Orbit transfer missions<br />
• Trajec<strong>to</strong>ry design w.r.t. mission constraints (including<br />
ground-station visibility, vehicle constraints, ...)<br />
• Vehicle design (tank sizing, staging, e.g. for FLPP)<br />
• Mission design <strong>and</strong> analysis (e.g. performance charts)<br />
• Mission support in ground segment
His<strong>to</strong>ry of ASTOS<br />
As<strong>to</strong>s<br />
Solutions<br />
1989 ALTOS 1 - Launcher trajec<strong>to</strong>ry <strong>optimization</strong><br />
1996 ALTOS 3 – Reference trajec<strong>to</strong>ry computation for<br />
capsule reentry<br />
1999 ALTOS 4 – Combined <strong>optimization</strong> of launch <strong>and</strong><br />
reentry as required for RLVs<br />
2000 First ASTOS for Microsoft Windows<br />
2001 SOCS-Add-on - Low thrust missions<br />
2002 Aeroassist maneuvers at mars <strong>and</strong> earth<br />
2003 DLL-Interface for user-coded models<br />
2005 CGA – Genetic Algorithm for interplanetary missions
ASTOS Applications in the Last 5 Years<br />
As<strong>to</strong>s<br />
Solutions<br />
Hopper<br />
Vega<br />
BeagleNet<br />
Electrical Vega<br />
Expert<br />
Skylon<br />
ATPE Ariane 5 ECA<br />
CTV 2<br />
Fly-Back Booster Capree<br />
Mars Demo L<strong>and</strong>er<br />
IXV<br />
Mars Ascent Vehicle ARD<br />
Beagle-2<br />
ExoMars09<br />
ConeXpress-OLEV Socrates<br />
Heavy Lift Launcher X38<br />
Lunar Excursion Vehicle<br />
Sphynx<br />
Soyuz<br />
CTV<br />
Conventional Launchers<br />
Advanced Launchers / RLV<br />
Reentry Vehicles<br />
Orbit Transfers / Others
ASTOS V6<br />
As<strong>to</strong>s<br />
Solutions<br />
ASTOS V6 is a corners<strong>to</strong>ne<br />
<strong>to</strong>wards an <strong>optimization</strong> software<br />
as a black box<br />
• Wizards guide inexperienced users<br />
• Au<strong>to</strong>matic mesh generation<br />
• Au<strong>to</strong>matic mesh refinement<br />
• Improved observation of the iteration<br />
process
ASTOS V6 Model Library<br />
As<strong>to</strong>s<br />
Solutions<br />
• Multiple cost functions<br />
• New visibility constraints<br />
• Splash down <strong>and</strong> safety analysis<br />
• GRAM 99 atmosphere with perturbations<br />
• LO-frame for attitude controls suitable for<br />
low thrust orbit transfers
What is New Before Optimization<br />
As<strong>to</strong>s<br />
Solutions<br />
Mesh definition was always a problem for many users!<br />
Au<strong>to</strong>matic mesh generation for the initial guess<br />
Advanced mesh modification features<br />
In a concurrent design engineering team a common data<br />
exchange format is needed!<br />
New data import features: all components, propulsions,<br />
aerodynamics, etc. may be configured by an ODBC source<br />
like an Excel sheet
ASTOS Data Exchange<br />
As<strong>to</strong>s<br />
Solutions<br />
Internal subsystem validation<br />
ASTOS<br />
Constraint<br />
limits of Propulsion<br />
system<br />
Table data of<br />
T, dm/dt, ce, c*<br />
drag, lift<br />
Correlation<br />
fac<strong>to</strong>rs for mass<br />
approximation<br />
Trajec<strong>to</strong>ry data<br />
Design Parameters<br />
Controls<br />
Excel Workbook<br />
Worksheets for:<br />
• various evolutions<br />
• Subsystems incl.<br />
detailed <strong>and</strong> reduced<br />
model (cells, tables)<br />
• additional calculations<br />
• Diagrams<br />
• ASTOS results<br />
Subsystem Software<br />
Correlation<br />
fac<strong>to</strong>rs for mass<br />
approximation<br />
incl region<br />
of validity<br />
Table data of<br />
thrust, massflow,<br />
drag, lift<br />
Mass of<br />
subsystems<br />
Request for<br />
traj. & data refinement<br />
Request for<br />
model & data refinement
And during Optimization<br />
As<strong>to</strong>s<br />
Solutions<br />
Users of <strong>optimization</strong> software are often stumped when<br />
an error arises during <strong>optimization</strong> <strong>and</strong> the <strong>optimization</strong><br />
doesn‘t converge!<br />
New <strong>and</strong> improved iteration viewer features let the user<br />
observe the iteration process in more detail<br />
In case of an error an au<strong>to</strong>matic problem analysis procedure<br />
supports the user <strong>to</strong> find obstacles like infeasable constraints<br />
Improved scaling
And After the Optimization Process<br />
As<strong>to</strong>s<br />
Solutions<br />
• new sensitivity analysis feature<br />
• comprehensive result visualisation capabilities<br />
• extended data export options
Result Visualisation<br />
As<strong>to</strong>s<br />
Solutions<br />
• Numeric Result Summary<br />
• Graphical Visualisation<br />
– 2D Plots<br />
– 3D Plots<br />
– 2D <strong>and</strong> 3D Map Plots<br />
auxiliary data (like ground stations) may be added <strong>to</strong> each plot type<br />
ASTOS users become more independant from expensive “plotting“<br />
<strong>to</strong>ols like Matlab or STK<br />
• Numerous export filters <strong>to</strong> visualize results with other<br />
<strong>to</strong>ols<br />
– Excel<br />
– Matlab<br />
– STK<br />
– Orbiter Space Flight Simula<strong>to</strong>r<br />
– Celestia<br />
– Text-file<br />
...
Events <strong>and</strong> Auxiliary Data<br />
As<strong>to</strong>s<br />
Solutions<br />
• Plot data from several sources<br />
– Optimization<br />
– Initial Guess<br />
– Other <strong>optimization</strong> results<br />
• Auxiliary objects<br />
– Ground stations<br />
– Impact points<br />
• Event visualisation (max/min, Ma=1, ...)<br />
– Max dynamic pressure<br />
– Max heat flux<br />
– Bending moment<br />
...
Groundtrack Plotting<br />
As<strong>to</strong>s<br />
Solutions<br />
• Different maps<br />
• 8 different projections<br />
• 3D with altitude<br />
information or simply 2D
Splash Down Analysis Plots<br />
As<strong>to</strong>s<br />
Solutions<br />
Impact Constraint<br />
Demised Objects<br />
Impact Points<br />
Ground Track
Result Overview<br />
As<strong>to</strong>s<br />
Solutions<br />
•Change size of individual plots<br />
•Arrange plots however you like<br />
•Change axes units<br />
•Add/move legends<br />
•Use several tabs<br />
•Save <strong>and</strong> load viewer settings <strong>and</strong> plot content<br />
•Print / export individual plot or complete view
Real Time Animation<br />
As<strong>to</strong>s<br />
Solutions<br />
• Comparison of real flight data with optimized<br />
data<br />
• Real time 3D animation during flight<br />
– Orbiter<br />
– STK<br />
– Celestia<br />
• Visualization of operation center displays<br />
with Orbiter
Advantages <strong>to</strong> your company<br />
As<strong>to</strong>s<br />
Solutions<br />
• Fast result computation<br />
Let you save time <strong>and</strong> cost<br />
• ASTOS is a commercial product<br />
Comprehensive cus<strong>to</strong>mer support<br />
- Service On-Site<br />
- Support on dem<strong>and</strong><br />
- Quick response<br />
- Internet Screen Sharing<br />
Continuous advancement of the software<br />
Extensive documentation<br />
• Flexible<br />
• One <strong>to</strong>ol for several applications<br />
Several departments can use ASTOS (with just one floating<br />
license)<br />
• Cus<strong>to</strong>mer specific features are possible
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