SYSTEMA / THERMICA version 4 Overview of the new capabilities

Transcription

1 SYSTEMA / THERMICA version 4 Overview of the new cpbilities Prepred by Mrc Jcquiu, SAS 16 th Europen Workshop on Therml nd ECLS Softwre, October 2002 SYSTEMA / THERMICA current sttus (1/3) SYSTEMA is common frmework for severl spcecrft pplictions : F R A M E W O R K Computing tech. Input/Ouput User Interfce Disply 2D 3D Modeler 3D Pre-processing Post-processing Ry Trcing Schemtic SYSTEMA A P P L I C A T I O N S Orbit Pointing Mss Rdition dose Debris Oxygen tom Plume Elect. propulsion Chem.Propulsion Outgssing Power Antenn ptterns Rditive Conduction Link to solvers THERMICA 2 16th Europen Workshop on Therml nd ECLS Softwre, october 2002

2 SYSTEMA / THERMICA current sttus (2/3) THERMICA is n integrted therml chin for the design of spcecrft therml control : - In fesibility studies - For technologicl choices (pssive or ctive controls) - During correltion with test predictions Allows therml considertions to hve n impct on the system design, mission plnning nd the concept of opertions THERMICA computes : - Therml rdition exchnges with spce nd between surfces - Externl fluxes : Sun, Plnet lbedo, Plnet IR emission - Therml conduction in structures - Tempertures by mens of other commercil pckges (Estn, Sind/G) Monte Crlo Ry Trcing THERMICA tkes dvntge of common developments with the other pplictions : frmework + mission tools - Reduced cost for users - Better synergy for evolutions 3 16th Europen Workshop on Therml nd ECLS Softwre, october 2002 SYSTEMA / THERMICA current sttus (3/3) Our development philosophy : - To be close to users (internl & externl) to fit their needs - Users meetings - Anlysis lso performed by softwre development tem - To use up-to-dte computing technologies : less Fortrn, more C/C++, use of OSS - To perform enhncements without incresing mintennce cost for users - The gol for isn t to mke profit with softwre but to improve engineering tools User feed-bck permits to identify the development priorities - Model genertion : - Requirement for CAD-like tools - Interfce with CAD tools - Combintion of sub-models - Therml model exchnge - Enhncements for plnetry missions - Up-to-dte user interfce : ergonomy, interctivity, link to office tools New cpbilities of Thermic version th Europen Workshop on Therml nd ECLS Softwre, october 2002

3 Import of CAD models After survey phse between nd prtners, tool for CAD model import will be developped in 2003 Mjor chrcteristics : - Use of STEP formt - Automtic cretion of supported shpes - Show / No Show cpbilities of objects - Pick of construction points for shpe cretion STEP SYSBAS 5 16th Europen Workshop on Therml nd ECLS Softwre, october 2002 FRAMEWORK of version 4 : min fetures New GUI bsed on Open Source Softwre, vilble on : SUN, HP, DEC, SGI, Windows, Linux (no need for externl GUI pckges such s Jv or Exceed) Modern look & feel bsed on stndrd PC tools ergonomy Improvement of interctive 3D grphics (fully OpenGL) Better integrtion into PC office tools - Copy/Pste from Thermic to PC clipbord Insert of figures in Office documents - Results vilble in Excel formt Mngement of submodels 6 16th Europen Workshop on Therml nd ECLS Softwre, october 2002

4 MODELER Current cpbilities (v3.2) : - Interctive objects/shpes cretion - Interctive pre-post-processing, with nimtions versus time - Pick of points/surfces/objects/nodes nd informtion feed-bck - Interctive motions ($AXIS) - Mteril dtbse mngement New fetures : - Mngement of submodels - Esy use of construction points - Improvement of interctive motions - Mngement of textures for nice displys of cotings - Mngement of cutting opertions 7 16th Europen Workshop on Therml nd ECLS Softwre, october 2002 ORBIT module New Kepler + J2 propgtor Mngement of orbits round ny plnet of the solr system Modelistion of interplnetry missions New rc connexion by V impulse Esy import of externlly computed orbits (orbit = ASCII file) Interctive visulistion 8 16th Europen Workshop on Therml nd ECLS Softwre, october 2002

5 POINTING module Synchronistion with orbitl rcs is no more necessry In ddition to the 14 existing pre-defined pointing directions : Pointing towrds ny plnet of the solr system from ny plnet of the solr system Esy definition of generl kinemtic sequences : - Trnsltions nd rottions given versus time - Movement from given ttitude to nother in given time - Movement with given trnsltion & rottion in given time Esy import of externlly computed kinemtics (kinemtics = ASCII file) Interctive definition of mobile prts by picking in the 3D view 9 16th Europen Workshop on Therml nd ECLS Softwre, october 2002 RADIATIVE module (1/3) Plnetry lbedo nd IR fluxes : - Ability to tke into ccount user-defined tbles giving IR & lbedo fluxes versus ltitude, longitude nd time - Useful for scientific missions (still used in ) & LEO stellites with smll inerti - Interctive disply of tbles Nturl enhncement of the existing lgorithm : - Integrtion of IR & lbedo fluxes evluted for ech solid ngle : 10 16th Europen Workshop on Therml nd ECLS Softwre, october 2002 IR = 6 = C 4 SUN F S, Plnet now X F now S, X ' 0 < X < 1

6 RADIATIVE module (2/3) Comprison with the clssicl modelistion : - Albedo & IR fluxes for cube (α=0.4 ε=0.75) on 1000 km heliosynchronous orbit with 13.5 H solr time of the scending node, t spring equinox (Albedo & IR tbles extrcted from Stellite Therml Control Hndbook, D.G.Gilmore) Erth pointing fce Velocity pointing fce IR Albedo 11 16th Europen Workshop on Therml nd ECLS Softwre, october 2002 RADIATIVE module (3/3) Improved thermo-opticl properties : bsorption, reflexion nd trnsmission coefficients depending on the light incidence ngle (with respect to the surfce norml) - Modelistion of some kind of BRDF - Tbulted thermo-opticl properties - Properties re-evluted for ech incident ry - The outgoing direction remins lmbertin or speculr Sttisticl ccurcy control : improvement of lrge models mngement how much rys to emit to rech given ccurcy on REFs nd fluxes Memory mngement for REF reciprocity lw enforcement : no more entire (n n) mtrix in memory (n=number of rditive nodes) no more size limit for rditive nodes Improved ry trcing : dptive size of voxels - Better memory mngement - Fster computtions for lrge models 12 16th Europen Workshop on Therml nd ECLS Softwre, october 2002

7 CONDUCTION module Current cpbilities (v3.2) : - Automtic computtion of couplings inside shpes - Automtic detection of contcts between shpes : - Edge contct - Surfce on top of nother surfce - Modelistion of contct resistnce New fetures : - Interctive disply / selection / definition of couplings in the 3D disply 13 16th Europen Workshop on Therml nd ECLS Softwre, october 2002 Development sttus / vilbility Version : december Sttisticl ccurcy control enhncement - REF reciprocity lw enforcement : no more limit on the nb of rditive nodes - Avilbility of the modeler Version 4 : june Orbit / Pointing / Rditive / Conductive modules - Btch lgorithms performed, vlidtion phse ending - User interfce + interctive plotting : under development - Frmework, Modeler : still under development Dely due to hrmonistion effort : - Generic environment for ll SYSTEMA modules - Ability to plug ny new module / ppliction in modern interctive frmework 14 16th Europen Workshop on Therml nd ECLS Softwre, october 2002