16 July 1999STEP for Aerospace Applications at NASA/GSFCsheet 1 ECSS Working Group “Exchange of...

16 July 1999 STEP for Aerospace Applications at NASA/GSFC sheet 1

ECSS Working Group“Exchange of Product Data”

and related work

Hans Peter de Koning (ESA/ESTEC/TOS-MCV)

European Space Research and Technology Centre

Thermal Control and Life Support Division

e-mail: [email protected]; phone: +31 (71) 565 3452; fax: +31 (71) 565 6142

mail: P.O. Box 299, Noordwijk, The Netherlands

(ECSS = European Co-operation for Space Standardisation)


Why need a WG and standard “Exchange of Product Data” ?

• Efficient and effective electronic exchange of product data is considered a key enabler forfaster/better/cheaper development of space products

• Long term, tool-independent archiving of product data is also needed in many space programmes

• European space community (industry and agencies) need a frame of reference in order to standardise on protocols for the communication of product data


Brief background of the WG

• 1994: ESA started developing STEP-based data exchange standards (in co-operation with CNES)– At first focusing on thermal analysis model exchange

• 1994 to 1998: interest broadened across disciplines– Electronic product definition, concurrent engineering, etc.– Growing maturity of STEP / more capable CAx tools

• May-98: first informal meeting industry and agencies to assess need, support, Draft Terms of Reference for a WG

• Feb-99: Officially installed as ECSS WG E-10-07


Tasks of the WG

• Review of existing international product data exchange standards and their suitability for use in space projects - focusing primarily on STEP

• Identification of areas for which adapting / developing space-specific STEP-based standards is cost-effective - recommendation and promotion of further actions

• Production of an ECSS standard for the exchange and archiving of product data in space projects– Including guidelines concerning the implementation / use of

the standard


Standardisation approach (1)

• ECSS E-10-07 is part of E-10 “System Engineering”• Addresses exchange via neutral standards

(1) between different tools of one discipline(2) between tools of different disciplines

• Archiving is considered an application of (1)



• Targeted disciplines:– ECSS-M-40 - Configuration Management– ECSS-M-50 - Information / Documentation Management– ECSS-M-70 - Integrated Logistic Support– ECSS-Q-70 - Material, Mechanical Parts & Processes– ECSS-E-10 - System Engineering– ECSS-E-20 - Electrical & Electronics– ECSS-E-30 - Mechanical (including thermal)– ECSS-E-40 - Software Engineering (only on CI level)– ECSS-E-60 - Control Systems– ECSS-E-70 - Ground Systems & Operations



• E-10-07 is an ‘umbrella’ standard– Specifies which standard to use for what PDE situation– Makes reference to existing international standards– Primary focus on ISO 10303 (STEP)– Adds guidelines / best practices on how to use the standard– Designed for tailoring by individual projects– Only file-based exchange in scope for first release



• Identified candidate STEP(-based) standards– AP 202: Associative draughting– AP 203: Configuration controlled design– AP 209: Composite and metallic structural analysis and related design– AP 210: Electronic assembly, interconnect and packaging design– AP 212: Electrotechnical design and installation– AP 214: Core data for automotive mechanical design processes– AP 232: Technical data packaging core information and exchange– AP 233: Systems engineering application protocol– STEP-TAS AP: Thermal Analysis for Space (ESA)– STEP-NRF AP: Network-model Results Format (ESA)– STEP-PRP AP: Propulsion Systems (CNES)


Requirement for tailoring

• It is very unlikely that in practice such a standard can be applied as a whole to a project

• It shall be possible to use the standard as a contractual document in a programme or projectby declaring a subset of applicable clausesto specify the data exchange protocolsthat shall be used between parties

• Requirement for tailoring is recognised across all ECSS standards


ECSS E-10-07Initial core requirements specification

• A extensive list of structured 4-element requirements:– “To exchange data

from a <source_discipline> representation– to a <destination_discipline> representation– for the purpose of transferring <kind_of_data>– the <exchange_standard> standard shall be used.”

• For long term archiving the requirement as for exchange within one discipline shall be used– Identical <source_discipline> and <destination_discipline>


Example excerpt of initial requirements specification (1)

To exchange data from a …representation

to a … representation for the purpose of transferring … the … standard shallbe used.

Subclause Source discipline Destination discipline Kind of data Exchange standard(s)4 E-30 ME - Design &

Construction EngineeringE-30 ME - Design &Construction Engineering

2D shape and tolerances definition,production drawings

[STEP-202] CC TBD

5 E-30 ME - Design &Construction Engineering

E-30 ME - Design &Construction Engineering

Configuration controlled designinformation and shapes represented bymanifold surface models with topology

[STEP-203] CC4



Configuration controlled designinformation and shapes represented byfacetted boundary-representation models

[STEP-203] CC5



Configuration controlled designinformation and shapes represented byadvanced boundary-representationmodels

[STEP-203] CC6



Component design with 3D shaperepresentation

[STEP-214] CC1



Assembly design with 3D shaperepresentation

[STEP-214] CC2


Example excerpt of initial requirements specification (2)

To exchange data from a …representation

to a … representation for the purpose of transferring … the … standard shallbe used.

Subclause Source discipline Destination discipline Kind of data Exchange standard(s)19 E-30 ME - Structural

EngineeringE-30 ME - StructuralEngineering

Linear static finite element EA model [STEP-209] CC TBD

20 E-30 ME - Thermal ControlEngineering

E-30 ME - Thermal ControlEngineering

Thermal-radiative EA model with basicgeometry

[STEP-TAS] CC1



Thermal-radiative EA model with basicgeometry and kinematic model

[STEP-TAS] CC2



Thermal-radiative EA model with basicand contructive geometry

[STEP-TAS] CC3



Thermal-radiative EA model with basicand contructive geometry and kinematicmodel

[STEP-TAS] CC4



Thermal-radiative EA model with basicgeometry, kinematic model and spacemission aspects

[STEP-TAS] CC5



Thermal-radiative EA model with basicand contructive geometry, kinematicmodel and space mission aspects

[STEP-TAS] CC6


Status/schedule of WG

• 17 members (1/3 from agencies, 2/3 from industry)• 3 working meetings held• Terms of reference written and agreed• First working draft produced

– Currently in review and comment loop– Proofs difficult to actively involve industry in production of

the standard (as always with long term benefits)

• Goal is first release of standard early 2000


Related work

• Since 1994, 3 STEP-based APs have been developed by European space community– STEP-TAS “Thermal Analysis for Space” (ESA)– STEP-NRF “Network-model Results Format” (ESA)– STEP-PRP “Propulsion” (CNES)

• TAS and NRF developed as companion APs together with common Integrated Application Resources:– “Space Domain”– “Definition and Results of Analysis, Tests and Operations”– “Thermal Analysis”


Status STEP-TAS & STEP-NRF

• Integrated Application Resources and APsavailable in fully compliant ISO TC 184/SC 4 format

• Full programming libraries available– With documentation (PDF, HTML)– C and FORTRAN APIs

• STEP-TAS CC1 converters implemented in– ESARAD 4.1 (released June 1999)– THERMICA (release of 1999-Q3)– Limited prototypes TRASYS and TSS (with NASA-JPL)

• STEP-NRF prototypes at Intespace and EdF


Future work related to STEP at ESA

• Continued implementation of STEP-TAS• Further development of STEP-NRF• AP203 (CC1,4,5,6) import facility in ESARAD

– Supports import of CAD product structure and shape– Will include support for NURBS in ESARAD model

• Idea for CAD-to-Analysis tool based on AP203


Idea AP203-based CAD-to-Analysis tool

– UNIX type pipe of filters– Open API

– Online visualisation

CAD AP203 CAx

filter

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