Simulation and Optimization
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1 A Major Step to Efficient Trajectory Simulation and Optimization Astrodynamics Workshop 200 Dipl.-Ing. Sven Weike ASTOS GmbH i.g
2 Content 1. What is ASTOS? 2. History of ASTOS 3. What is new in ASTOS V6
3 What is ASTOS? ASTOS is an abbreviation for Aerospace Trajectory Optimization Software Graphical User Interface Optimization Methods PROMIS TROPIC CAMTOS CGA SOCS ASTOS Model Library
4 ASTOS Capabilities Performance evaluations of specific launch and reentry vehicles (payload maximization, fuel allocation, etc.) Orbit transfer missions Trajectory design w.r.t. mission constraints (including ground-station visibility, vehicle constraints,...) Vehicle design (tank sizing, staging, e.g. for FLPP) Mission design and analysis (e.g. performance charts) Mission support in ground segment
5 History of ASTOS 1989 ALTOS 1 - Launcher trajectory optimization 1996 ALTOS 3 Reference trajectory computation for capsule reentry 1999 ALTOS 4 Combined optimization of launch and reentry as required for RLVs 2000 First ASTOS for Microsoft Windows 2001 SOCS-Add-on - Low thrust missions 2002 Aeroassist maneuvers at mars and earth 2003 DLL-Interface for user-coded models 2005 CGA Genetic Algorithm for interplanetary missions
6 ASTOS Applications in the Last 5 Years Hopper Vega BeagleNet Electrical Vega Expert Skylon ATPE Ariane 5 ECA CTV 2 Fly-Back Booster Capree Mars Demo Lander IXV Mars Ascent Vehicle ARD Beagle-2 ExoMars09 ConeXpress-OLEV Socrates Heavy Lift Launcher X38 Lunar Excursion Vehicle Sphynx Soyuz CTV Conventional Launchers Advanced Launchers / RLV Reentry Vehicles Orbit Transfers / Others
7 ASTOS V6 ASTOS V6 is a cornerstone towards an optimization software as a black box Wizards guide inexperienced users Automatic mesh generation Automatic mesh refinement Improved observation of the iteration process
8 ASTOS V6 Model Library Multiple cost functions New visibility constraints Splash down and safety analysis GRAM 99 atmosphere with perturbations LO-frame for attitude controls suitable for low thrust orbit transfers
9 What is New Before Optimization? Mesh definition was always a problem for many users! Automatic mesh generation for the initial guess Advanced mesh modification features In a concurrent design engineering team a common data exchange format is needed! New data import features: all components, propulsions, aerodynamics, etc. may be configured by an ODBC source like an Excel sheet
10 ASTOS Data Exchange Internal subsystem validation ASTOS Constraint limits of Propulsion system Table data of T, dm/dt, ce, c* drag, lift Correlation factors for mass approximation Trajectory data Design Parameters Controls Excel Workbook Worksheets for: various evolutions Subsystems incl. detailed and reduced model (cells, tables) additional calculations Diagrams ASTOS results Subsystem Software Correlation factors for mass approximation incl region of validity Table data of thrust, massflow, drag, lift Mass of subsystems Request for traj. & data refinement Request for model & data refinement
11 And during Optimization? Users of optimization software are often stumped when an error arises during optimization and the optimization doesn t converge! New and improved iteration viewer features let the user observe the iteration process in more detail In case of an error an automatic problem analysis procedure supports the user to find obstacles like infeasable constraints Improved scaling
12 And After the Optimization Process? new sensitivity analysis feature comprehensive result visualisation capabilities extended data export options
13 Result Visualisation Numeric Result Summary Graphical Visualisation 2D Plots 3D Plots 2D and 3D Map Plots auxiliary data (like ground stations) may be added to each plot type ASTOS users become more independant from expensive plotting tools like Matlab or STK Numerous export filters to visualize results with other tools Excel Matlab STK Orbiter Space Flight Simulator Celestia Text-file...
14 Events and Auxiliary Data Plot data from several sources Optimization Initial Guess Other optimization results Auxiliary objects Ground stations Impact points Event visualisation (max/min, Ma=1,...) Max dynamic pressure Max heat flux Bending moment...
15 Groundtrack Plotting Different maps 8 different projections 3D with altitude information or simply 2D
16 Splash Down Analysis Plots Impact Constraint Demised Objects Impact Points Ground Track
17 Result Overview Change size of individual plots Arrange plots however you like Change axes units Add/move legends Use several tabs Save and load viewer settings and plot content Print / export individual plot or complete view
18 Real Time Animation Comparison of real flight data with optimized data Real time 3D animation during flight Orbiter STK Celestia Visualization of operation center displays with Orbiter
19 Advantages to your company Fast result computation Let you save time and cost ASTOS is a commercial product Comprehensive customer support - Service On-Site - Support on demand - Quick response - Internet Screen Sharing Continuous advancement of the software Extensive documentation Flexible One tool for several applications Several departments can use ASTOS (with just one floating license) Customer specific features are possible
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