ESTEC TOS-MC Thermal and Structures Division SIMULOG 25-27 January 2000 NASA's STEP for Aerospace Workshop at JPLSheet 1 STEP for Space Applications -

25-27 January 2000

NASA's STEP for Aerospace Workshop at JPL Sheet 1

ESTEC TOS-MCThermal and Structures Division

SIMULOG

STEP for Space Applications -TAS and NRF Development

Hans Peter de Koning (ESA/ESTEC D/TOS-MCV)[email protected]

Eric Lebègue (SIMULOG)[email protected]

25-27 January 2000



SIMULOG

Topics of this presentation

• Overview of Application Protocols

• Current status of implementations

• Brief demo with ESARAD

• STEP-TAS Converter Development Toolkit

STEP-NRFNetwork-modelResults Format

Application Protocol

STEP-TASThermal Analysis

for Space


25-27 January 2000



SIMULOG

NRF and TAS main documents

STEP-NRFNetwork-modelResults Format


STEP-TASThermal Analysis

for Space


Definition and Resultsof Analyses, Tests

& Operations

Integrated Application Resource

SpaceDomain


ThermalAnalysis


25-27 January 2000



SIMULOG

Application Reference Model& Units of Functionality

TASspace_mission_aspects

geometric_modelkinematic_model

thermal_radiative_modelvisual_presentationmaterial_properties

additional_physical_quantities_and_measures

NRFproduct_structurenetwork_model_representationbulk_resultsparameterized_functionsdate_and_timegeneral_support

The ARM is organised in UoFsUoFs are collections of application objects and their relationships specified in the terminology of the application domain

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SIMULOG

Main characteristics of NRF (1)

• Generic discipline-independent protocol

• Scope is definition and representation of:– engineering objects represented by a network-model of discrete

nodes and relationships between the nodes -network-model may contain a submodel hierarchy

– representation of properties of engineering objects for which result values can be predicted / observed at discrete states

– analysis, test or operational campaigns / cases / phases

– analysis, test or operational runs with associated results

– product structure compliant with AP203 CC1 / PDM schema

– relationships between product structure and network-model

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SIMULOG


• Results are properties with value and unit– Descriptive values (text string, item from enumerated list)

– Numerical values (scalar, vector, tensor)

– Parameterised function values (tabular interpolation, polynomial, limited expressions)

• NRF protocol has two separate parts:– “Static protocol”, discipline-independent data structures

– Dictionairies defining node and node-relationship classes, properties, property-qualifiers, property-value-range, ...

• Purpose of dictionairies is to enable flexible / adaptable use without need to re-issue the standard

25-27 January 2000



SIMULOG


• Great care is taken to define light, efficient data structures

– Sparsely populated results value space

– Properties only one kind of unit in a data set

• Starting on development of a “best of both worlds” solution

– NRF for semantics

– HDF5 for efficient binary portable implementation method (HDF = Hierarchical Data Format by NCSA)

25-27 January 2000



SIMULOG

Main characteristics of TAS (1)

• Self contained, complete Application Protocol– AAM, ARM, Mapping Table, AIM, Express-G (586 pages)

– Conforms to TC184/SC4 methods and guidelines

• Geometry defined as AP203 CC4 surfaces

• Thermal-radiative model faces added as associated features– Including possibility to support hierarchical submodel tree

– Associated notional thickness, surface material and bulk material

– Thermo-optical, thermo-physical properties for named material

– Concept of material property environment (Part 45)

• Kinematic model conform STEP Part 105 for articulating rigid bodies (e.g. rotating solar arrays, gimballed antennas)

25-27 January 2000



SIMULOG

Main characteristics of TAS (2)

• Space mission aspects– 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

• Boolean construction surfaces available for advanced tools

• STEP-TAS CC1 Abstract Test Suite– conform STEP Part 3xx series

– test suite has been used in validation of TAS processors

25-27 January 2000



SIMULOG

TAS geometry and thermal-radiative models

p2

direction-1

direction-2

p3

p1

diameter

start_angle

end_angle

• Shapes– Primitives: triangle, rectangle,

quadrilateral, disc, cylinder, cone, sphere, paraboloid

– Compound shapes

– Shapes conform to AP203 CC4 non-manifold surfaces

• Thermal-radiative model– associates thermal-radiative

faces with surface shapes

– thermal mesh

– surface and bulk material

25-27 January 2000



SIMULOG

Illustration of basic TAS Keplerian orbit definition

periapsis

apoapsis

true_anomaly

North

ascending_node

right_ascension_of_ascending_node

argument_of_periapsis

main body (of spacecraft)

to star

declination

25-27 January 2000



SIMULOG

STEP-TAS Conformance Classes

thermal-radiative model with basic geometry

kinematic model

constructivegeometry

space missionaspects

CC-1

CC-2

CC-3

CC-4

CC-5

CC-6

25-27 January 2000



SIMULOG

STEP-NRF implementation status

• Read/write library available with C and FORTRAN binding

• Prototypes produced with CNES and Electricité de France

• Being prepared for use in ESA’s next generation integrated thermal analysis tool code-named ‘Polytan’ as an open post-processing interface

25-27 January 2000



SIMULOG

STEP-TAS Implementation Status

• Read/write libraries available with C and FORTRAN bindings – Including programming tutorials / manuals (HTML and PDF)

– Ported and verified on 5 platforms: PC/Windows, Sun/Solaris, HP/HP-UX, Compaq-Dec/Tru64, SGI/Irix

– High level interface layer included at ARM/user domain level; Provides very significant savings in processor development effort

• Working processors– CC1 processor in ESARAD 4.1.x (released summer 1999)

– CC1 processor in THERMICA release April 2000

– Currently large model cross validation ESARAD - THERMICA

– Proof-of-concept prototypes developed with NASA-JPL for TRASYS and TSS (1998)

25-27 January 2000



SIMULOG

ROSETTA in ESARAD

25-27 January 2000



SIMULOG

ROSETTA in Baghera View

25-27 January 2000



SIMULOG

ROSETTA in THERMICA

25-27 January 2000



SIMULOG

Doris in THERMICA

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SIMULOG

Doris in Baghera View

25-27 January 2000



SIMULOG

DORIS in ESARAD

25-27 January 2000



SIMULOG

Mars Rover in TSS

25-27 January 2000



SIMULOG

Mars Rover in Baghera View

25-27 January 2000



SIMULOG

Mars Rover in ESARAD

25-27 January 2000



SIMULOG

Mars Rover in THERMICA

25-27 January 2000



SIMULOG

STEP-TAS future

• STEP-TAS Processor Development Kit available to thermal analysis tool vendors– From SIMULOG at nominal cost EURO/USD 1000 (Jan-2000)

Including initial e-mail tech-support

– Baghera View is available in addition (Contact Eric Lebègue)

• ESA is considering proposing STEP-TAS to ISO TC184/SC4– New Work Item leading to new ISO 10303 part

• Continue large model cross-validation and performance tuning

• Initiate support for other conformance classes

Documents

ESTEC TOS-MC Thermal and Structures Division SIMULOG 25-27 January 2000 NASA's STEP for Aerospace Workshop at JPLSheet 1 STEP for Space Applications -