1. DOSRAD V4 presentation E-mail: engineering.software@astrium.eads.netengineering.software@astrium.eads.net Web: http://www.systema.astrium.eads.net/http://www.systema.astrium.eads.net/

2. SYSTEMA A Tool Suite designed for Advanced Modeling in Space Environment General Presentation

3. Perform End-to-End Modelling SYSTEMA Import or Generate Geometrical Model + Physical Properties Advanced Trajectory into the Solar System Advanced Kinematics Set and Configure Mission Scenario Computation Diagram Parametric Data

4.  Dedicated Framework to Space Analysis Powerful  A Powerful 3D Modeler interfacing with:  CAD Geometry(STEP-AP 203)  3D model design(vrml)  Mechanical mesh (Nastran bdf)  Thermal model (STEP-TAS) SYSTEMA modeler Model in CATIA CAD Files Import in THERMICA

5.  Easy 3D manipulation  Standard mouse zoom, pan, rotate  Multi-viewers / multi-models management  Simultaneous points of view of a model  Several models can be loaded  Display of the results on the 3D model 3 views of a model CAD model SYSTEMA model CAD model + SYSTEMA model  Easy model creation  Hierarchical description  Interactive shapes creation  Interface with CAD and mechanical tools  Rich help for CAD models simplification  Management of complex shapes (boolean cut) THERMICA results SYSTEMA Modeler

6. Systema applications Systema V4 embeds in the same environment, sharing the same model and mission description, a set of applications:  Thermica  Plume for plume impingement  GTD for antenna / structure interactions  Dosrad for dose and shielding

7. Dosrad General presentation Content

8. Function  Dose integration performed by a solid angle sectoring analysis :  Rays are traced from the dose point outwards through the spacecraft.  For each ray, the amount of shielding encountered is determined taking into account the material density.  From the dose depth curve, the weighted dose contribution is calculated.  The average doses per mesh and then per face are obtained.

9. General principles Equivalent aluminium thicknesses Dose curve Total dose rad(Si)

10. Outputs  Dose on a point  dose received by a component  Dose / shielding on a bounding box  Dose is computed on a fictive box surrounding an equipment  Specifications of protective thickness to subcontractor  Mapping of dose on a meshed surface  Dose on material / optics…

11. Dosrad – 4.4.2 New functionalities Content

12. Dosrad – 4.4.2 Highlight: honeycomb modeling  Honeycomb generally represented either with only the two face sheets, either with a mass equivalent volume because detailed modeling is out of reach in the tools today  Computations have been made to compare the two different standard approaches with a detailed modeling on a panel alone  Main conclusion / benefit:  the mass equivalent approach is underestimating the dose by a factor of 2 in some cases  Database of results on a dozen honeycomb panel types for various environment (GEO, L2, Jupiter) New functionalities  Development of an incidence angle dependant model allowing to obtain dose between worst case two face sheet model and complete model

13. Dosrad – 4.4.2 Framework Functionalities  Ray path display  Multithreaded capabilities  Batch capabilities coupled with variable definitions: Systema can be integrated as a black box in user’s own calculation suite. Possible applications: optimization, parametric analysis. Already used on Laplace/JGO to compute “optimal” shielding mass  Direct computation on STEP-AP203 and VRML2.0 input files New functionalities

14. Dosrad – 4.4.2 Dosrad Specific Functionalities  Volume modeling  Dose Cartography / Mapping computation allowing to have a mean dose on a surface  Computation of satellite equivalent thickness for sub specification New functionalities

15. Dosrad – 4.4.2 Future Developments Content

16. Dosrad – 4.4.2  Framework  GDML export to ease the communication with Geant4 / GRAS  Interface with Python allowing scripting / batch mode use of Systema  STEP-SPE import / export  Dosrad  Extended use of multithreading  NORM thicknesses for Volumes (minimum path, SSAT path)  Shielding mass and thickness computation wrt a specified dose (useful for Phase 0 / Phase A)  DDC computation by means of depth curve  Environment  Integration of AE9 / AP9 Future developments