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

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

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

January 18, 2001GS - STEP-TASSlide - 4 Electrotechnical design: AP210 and AP212 Electromechanical design: AP210 and AP212 Structural analysis: AP209 Documentation: PDF Documentation: PDF, HTML Propulsion: STEP-PRP Mass-CoG-MoI: STEP-MCI (subset of AP214) Optical analysis: NODIF … (other discipline oriented protocols) Fluid Dynamics (& other discipline oriented protocols) Thermal analysis: STEP-TAS Mechanical and assembly design: AP203 and AP214 system product definition analysis & simulation & test results & delivery Results of Analysis, Test and Operation Campaigns: STEP-NRF Results of Analysis, Test and Operation Campaigns: STEP-NRF Product Configuration: AP203 / AP214 / PDM Schema Product Configuration: AP203 / AP214 / PDM Schema System Engineering: AP233 Technical Data Package: AP233 Technical Data Package: AP232 ISO Industrial Automation Systems - Product representation and exchange ISO Industrial Automation Systems - Product representation and exchange ECSS WG E Exchange of Product Data ECSS WG E Exchange of Product Data In production useCommercial implementation startedFinal stages of development STEP Architecture for Aerospace *European Cooperation for Space Standardization * You are here

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

January 18, 2001GS - STEP-TASSlide - 6 Details of STEP-TAS n Shapes l Primitives: triangle, rectangle, quadrilateral, disc, cylinder, cone, sphere, paraboloid l Compound shapes l Shapes conform to AP203 CC4 non-manifold surfaces n Thermal-radiative model l associates thermal-radiative faces with surface shapes l thermal mesh l properties

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

January 18, 2001GS - STEP-TASSlide - 8 Details of STEP-TAS n Kinematic model conforms to STEP Part 105 for articulating rigid bodies (e.g. rotating solar arrays, gimballed antennas

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

January 18, 2001GS - STEP-TASSlide - 10 Examples of STEP-TAS Exchanges STEP-TAS TSS ESARAD Thermica (hand coded)

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

January 18, 2001GS - STEP-TASSlide - 12 The U.S. STEP-TAS Pilot - Geometry ISO ; 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, 2001GS - STEP-TASSlide - 13 Live Demo at NASA TFAWS Conference

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

January 18, 2001GS - STEP-TASSlide - 15 Benefit: Compliance with NASA Standard 2817 The NASA CIO has officially approved and released NASA- STD-2817 (, which includes the requirement for CAx systems used by NASA to have tools that support ISO (STEP). The NASA CIO has officially approved and released NASA- STD-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 (STEP). n 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. n Tools that enable data interchange, compliant with these standards, must be available to all CAE/CAD/CAM users at each NASA Center.

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

January 18, 2001GS - STEP-TASSlide - 17 Benefits of STEP - TAS l 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

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

January 18, 2001GS - STEP-TASSlide - 19 Remember STEP is... S omething T o E mbrace P ermanently