STEPTAS and its Benefits to Thermal Engineering STEP

STEP-TAS and its Benefits to Thermal Engineering STEP for Aerospace Workshop January 18, 2001 Georg Siebes

Outline STEP n Zooming in on STEP-TAS Detail n The U. S. STEP-TAS Pilot n What are the benefits n January 18, 2001 2 GS - STEP-TAS

What is STEP n STEP = STandard for the Exchange of Product model data = casual name for ISO 10303 “STEP is an international standard, which provides an unambiguous, computerinterpretable definition of the physical and functional characteristics of a product throughout its life cycle. ” January 18, 2001 3 GS - STEP-TAS

STEP Architecture for Aerospace * Documentation: PDF, HTML Documentation: PDF ECSS Structural analysis: AP 209 Thermal analysis: STEP-TAS Propulsion: STEP-PRP Mass-Co. G-Mo. I: STEP-MCI (subset of AP 214) Technical Data Package: AP 232 Technical Data Package: AP 233 Results of Analysis, Test and Operation Campaigns: STEP-NRF Product Configuration: AP 203 / AP 214 / PDM Schema Electromechanical design: AP 210 and AP 212 Electrotechnical design: AP 210 and AP 212 Optical analysis: NODIF You are here Industrial Automation Systems Product representation and exchange Fluid Dynamics (& other discipline oriented protocols) … (other discipline oriented protocols) system In production use January 18, 2001 ISO 10303 Mechanical and assembly design: AP 203 and AP 214 System Engineering: AP 233 WG E-10 -07 Exchange of Product Data *European Cooperation for Space Standardization product definition analysis & simulation & test Commercial implementation started 4 results & delivery Final stages of development GS - STEP-TAS

What is STEP-TAS n STEP-TAS = Thermal Analysis for Space Application Protocol for space missions and models used in thermal analysis. January 18, 2001 5 GS - STEP-TAS

Details of STEP-TAS n Shapes l p 2 direction-1 l l end_angle n p 1 Thermal-radiative model l diameter direction-2 start_angle l p 3 l January 18, 2001 6 Primitives: triangle, rectangle, quadrilateral, disc, cylinder, cone, sphere, paraboloid Compound shapes Shapes conform to AP 203 CC 4 non-manifold surfaces associates thermal-radiative faces with surface shapes thermal mesh properties GS - STEP-TAS

Details of STEP-TAS n Space mission aspects l l main body (of spacecraft ) l true_anomaly governing_celestial_body eccentricity periapsis l =1 semi_major_axis January 18, 2001 7 orbit arc (Keplerian and discrete ephemeris) space co-ordinate system, celestial bodies orientation, general and named pointing, spinning, linear rotation rates space thermal environment, including constant or lat/long dependent albedo / planetshine tables GS - STEP-TAS

Details of STEP-TAS +Y panel 2 main body +Y panel 1 +Y yoke +Y shaft +Y -Y shaft +Y shaft -Y yoke +Y yoke main body +Z -Y yoke +X -Y panel 1 +Y panel 1 -Y panel 2 +Y panel 2 -Y shaft -Y panel 1 is a kinematic_link -Y panel 2 (a) Schematic shape model of a typical communications satellite with two fully deployed solar array wings January 18, 2001 is a kinematic_joint (b) The corresponding kinematic_model presented as a topological graph 8 n Kinematic model conforms to STEP Part 105 for articulating rigid bodies (e. g. rotating solar arrays, gimballed antennas GS - STEP-TAS

Examples of STEP-TAS Exchanges STEP-TAS Viewer Thermica ESARAD January 18, 2001 9 GS - STEP-TAS

Examples of STEP-TAS Exchanges STEP-TAS ESARAD d) (ha e od c d n Thermica TSS January 18, 2001 10 GS - STEP-TAS

The U. S. STEP-TAS Pilot - Participants January 18, 2001 11 GS - STEP-TAS

The U. S. STEP-TAS Pilot - Geometry ISO-10303 -21; HEADER; . . . #109=TYPE_QUALIFIER('diffuse'); #110=TYPE_QUALIFIER('infra_red'); #111=ATR_PROPERTY_NAME('transmittance'); #112=ATR_PROPERTY_QUANTITATIVE(#111, . SYMMETRICAL. ); #113=ATR_PROPERTY_USAGE(#71, #112, #114); #114=ATR_PROPERTY_MEANING((#109, #110)); #115=SI_UNIT(*, $, . METRE. ); #116=SI_UNIT(*, $, . DEGREE_CELSIUS. ); #117=GLOBAL_UNIT_ASSIGNED_CONTEXT('', (#115, #116)); #118=GLOBAL_UNCERTAINTY_ASSIGNED_CONTEXT('', (#119, #120)); #119=UNCERTAINTY_MEASURE_WITH_UNIT(LENGTH_MEASURE(1. E-008), #115, . . . January 18, 2001 12 GS - STEP-TAS

Live Demo at NASA TFAWS Conference January 18, 2001 13 GS - STEP-TAS

Current STEP-TAS Implementation Status Prototype available TRASYS IMOS ESARAD ESA starting complete implementation JPL multi-disciplinary in-house tool Available without Boolean operations TSS One shot Mars Rover demonstrator, complete implementation planned THERMICA Available for small models Thermal Desktop (Rad. Cad) complete implementation (beta) Cross validation for large models, expected soon STEP-TAS CORATHERM TAS (Harvard Thermal) Planned for 2001 complete implementation planned SINDA/ATM complete in progress January 18, 2001 complete implementation planned Nevada Baghera View complete implementation planned 14 Available through SIMULOG GS - STEP-TAS

Benefit: Compliance with NASA Standard 2817 n n n The NASA CIO has officially approved and released NASASTD-2817 (COMPUTER-AIDED ENGINEERING, DESIGN AND MANUFACTURING DATA INTERCHANGE), which includes the requirement for CAx systems used by NASA to have tools that support ISO 10303 (STEP). Preferred standards include APs 203, 209, 210, 225, and 227 for exchanging data among PDM, mechanical and electronic CAD/CAM, civil and facilities CAD, and CAE/analysis systems. STEP-TAS included in draft of next revision. Tools that enable data interchange, compliant with these standards, must be available to all CAE/CAD/CAM users at each NASA Center. January 18, 2001 15 GS - STEP-TAS

Benefit: Significant reduction in translators ~ N 2 ~N Point to Point Translators STEP January 18, 2001 16 GS - STEP-TAS

Benefits of STEP - TAS Thermal Radiation models can be freely exchanged globally l Some thermal processes can be tailored to needs rather than being driven by tools l Thermal models can be archived and retrieved independent of tool proprietary formats l Will save time and money l Engineers can spend more time engineering and less time translating data l January 18, 2001 17 GS - STEP-TAS

Benefits Demonstrate that. . . Faster, Better, Cheaper reduced cycle time Art to Part faster time to market. . . are January 18, 2001 18 not just words GS - STEP-TAS

Remember STEP is. . . S omething To E mbrace P ermanently January 18, 2001 19 GS - STEP-TAS