Space engineering - Exchange of thermal analysis data

The purpose of this NWIP is to produce an ECSS standard for the Exchange of Thermal Model Data for Space Applications. The standard will be based on a draft standard resulting from an activity performed by ESA only in 2013/2014 called "Standard for Exchange of Thermal Model Data for Space Applications".
The content of the standard is already defined in draft form under the name "STEP-TAS" ("STEP-based draft application protocol for Thermal Analysis for Space"). This protocol has been implemented in a number of thermal analysis tools and is successfully used in both ESA and non-ESA space projects. The maturity of the protocol is therefore well-established.
The global objective of this document is to define and describe the standard protocol for Exchange of Thermal Model Data for Space Applications, previously known as STEP-TAS protocol.

Raumfahrttechnik - Austausch von Daten der Thermalanalyse

Ingénierie spatiale - Echange des données des analyses thermique

Vesoljska tehnika - Izmenjava podatkov termične analize

Namen tega dokumenta NWIP je ustvariti standard ECSS za izmenjavo podatkov termičnega modela za letalsko strojno opremo. Standard bo temeljil na osnutku standarda, ki izhaja samo iz dejavnosti organizacije ESA v 2013/2014, imenovanega »Izmenjava podatkov termičnega modela za letalsko strojno opremo«. Vsebina standarda je že opredeljena v osnutku pod imenom »STEP-TAS« (»osnutek aplikacijskega protokola na osnovi STEP za termično analizo za letalsko strojno opremo«). Ta protokol izvajajo številna orodja za termično analizo ter se uspešno uporablja v vesoljskih programih ESA in drugih vesoljskih programih. Zrelost protokola je tako dobro uveljavljena.  Globalni cilj tega dokumenta je opredeliti in opisati standardni protokol za izmenjavo podatkov termičnega modela za letalsko strojno opremo, prej poznanega kot protokol STEP-TAS.

General Information

Status
Published
Public Enquiry End Date
31-Jul-2017
Publication Date
25-Mar-2019
Technical Committee
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
21-Mar-2019
Due Date
26-May-2019
Completion Date
26-Mar-2019

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SLOVENSKI STANDARD
SIST EN 16603-31-04:2019
01-maj-2019
9HVROMVNDWHKQLND,]PHQMDYDSRGDWNRYWHUPLþQHDQDOL]H
Space engineering - Exchange of thermal analysis data
Raumfahrttechnik - Austausch von Daten der Thermalanalyse
Ingénierie spatiale - Echange des données des analyses thermique
Ta slovenski standard je istoveten z: EN 16603-31-04:2019
ICS:
35.240.99 8SRUDEQLãNHUHãLWYH,7QD IT applications in other fields
GUXJLKSRGURþMLK
49.140 Vesoljski sistemi in operacije Space systems and
operations
SIST EN 16603-31-04:2019 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 16603-31-04:2019
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SIST EN 16603-31-04:2019
EUROPEAN STANDARD
EN 16603-31-04
NORME EUROPÉENNE
EUROPÄISCHE NORM
March 2019
ICS 35.240.99; 49.140
English version
Space engineering - Exchange of thermal analysis data

Ingénierie spatiale - Échange des données d'analyse Raumfahrttechnik - Austausch von thermischen

thermique Modelldaten für Raumfahrtanwendungen
This European Standard was approved by CEN on 9 November 2018.

CEN and CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for

giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical

references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to

any CEN and CENELEC member.

This European Standard exists in three official versions (English, French, German). A version in any other language made by

translation under the responsibility of a CEN and CENELEC member into its own language and notified to the CEN-CENELEC

Management Centre has the same status as the official versions.

CEN and CENELEC members are the national standards bodies and national electrotechnical committees of Austria, Belgium,

Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany,

Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania,

Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom.

CEN-CENELEC Management Centre:
Rue de la Science 23, B-1040 Brussels

© 2019 CEN/CENELEC All rights of exploitation in any form and by any means Ref. No. EN 16603-31-04:2019 E

reserved worldwide for CEN national Members and for
CENELEC Members.
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Table of contents

European Foreword ................................................................................................... 4

Introduction ................................................................................................................ 5

1 Scope ....................................................................................................................... 6

2 Normative references ............................................................................................. 7

3 Terms, definitions and abbreviated terms ............................................................ 8

3.1 Terms from other standards ...................................................................................... 8

3.2 Terms specific to the present standard ..................................................................... 8

3.3 Abbreviated terms..................................................................................................... 9

3.4 Nomenclature ......................................................................................................... 10

4 Overview of STEP-TAS......................................................................................... 11

4.1 Introduction ............................................................................................................. 11

4.2 Modular breakdown of the STEP-TAS protocol ....................................................... 11

4.3 End user perspective on STEP-TAS ....................................................................... 13

4.4 Conformance .......................................................................................................... 14

4.5 Typical STEP-TAS software architecture ................................................................ 15

4.6 Metadata ................................................................................................................ 16

5 Requirements ........................................................................................................ 18

5.1 Datasets ................................................................................................................. 18

5.2 Diagnostics ............................................................................................................. 18

5.3 Validation ................................................................................................................ 18

5.4 Conformance .......................................................................................................... 19

5.5 Metadata ................................................................................................................ 20

5.5.1 Header section .......................................................................................... 20

5.5.2 Data section .............................................................................................. 20

Annex A (normative) EXPRESS Schema for STEP-TAS Datasets - DRD ............ 22

A.1 DRD identification ................................................................................................... 22

A.1.1 Requirement identification and source document ...................................... 22

A.1.2 Purpose and objective ............................................................................... 22

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A.2 Expected response ................................................................................................. 23

A.2.1 Scope and content .................................................................................... 23

A.2.2 Special remarks ........................................................................................ 23

Annex B (informative) STEP-TAS dictionary ......................................................... 24

Annex C (informative) Human readable STEP-TAS protocol ............................... 25

Annex D (informative) Conformance table template for GMM ............................. 26

D.1.1 General remarks ....................................................................................... 26

D.1.2 Primitive bounded surfaces ....................................................................... 26

D.1.3 Cutting solids ............................................................................................ 27

Bibliography ............................................................................................................. 29

Figures

Figure 4-1: Informal UML Package Diagram showing STEP-TAS Dependencies ................. 12

Figure 4-2: Informal UML Component Diagram Showing STEP-TAS Software

Architecture ........................................................................................................ 16

Tables

Table 4-1: STEP-TAS Conformance Classes ....................................................................... 14

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European Foreword
This document (EN 16603-31-04:2019) has been prepared by Technical
Committee CEN-CENELEC/TC 5 “Space”, the secretariat of which is held by
DIN.
This standard (EN 16603-31-04:2019) originates from ECSS-E-ST-31-04C.
This European Standard shall be given the status of a national standard, either

by publication of an identical text or by endorsement, at the latest by September

2019, and conflicting national standards shall be withdrawn at the latest by
September 2019.
Attention is drawn to the possibility that some of the elements of this document
may be the subject of patent rights. CEN [and/or CENELEC] shall not be held
responsible for identifying any or all such patent rights.
This document has been prepared under a standardization request given to
CEN by the European Commission and the European Free Trade Association.
This document has been developed to cover specifically space systems and has
therefore precedence over any EN covering the same scope but with a wider
domain of applicability (e.g. : aerospace).
According to the CEN-CENELEC Internal Regulations, the national standards
organizations of the following countries are bound to implement this European
Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic,
Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France,
Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia,
Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United
Kingdom.
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Introduction
The space industry is a domain in which complex products are developed and
operated by (usually large) international teams. Analysis and testing are
essential activities within the engineering process across all disciplines and
thermal control is no exception.
It is not usually possible for the many partners in the industrial teams to

standardise on the same tools for thermal analysis and test or operations results

data processing. Nor is it desirable to do so for a number of reasons:
• each partner should have the possibility to optimise their own processes;
• different tools may be more appropriate at different levels of the supply
chain;
• healthy competition between the tool vendors promotes improvement
and innovation at an affordable cost.
It is evident though, that for this philosophy to work, there is a need for easy
and reliable data exchange.
An open standard that specifies an adequate neutral data format is the only
viable way to realize reliable and cost effective data exchange and data sharing
for the thermal analysts in the space industry. The STEP-TAS protocol provides
this.
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Scope
The requirements in this standard address the use of the STEP-TAS protocol for
the exchange of thermal analysis data for space applications.
The intended audience for the requirements contained in this document is the
developers of space thermal analysis software. The overview of STEP-TAS
provided in clause 4 can also be of more interest general to a wider audience.
The requirements contained within this standard do not address the end users of
the space thermal analysis tools – namely thermal engineers and thermal

analysts. The rationale for this decision is that the primary applicable document

for space thermal engineers (working on European projects) is the thermal control

standard ECSS-E-ST-31. As such the best location for requirements addressing
thermal engineers and analysts is the top level standard ECSS-E-ST-31.

This standard may be tailored for the specific characteristic and constraints of a

space project in conformance with ECSS-S-ST-00.
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Normative references
The following normative documents contain provisions which, through
reference in this text, constitute provisions of this ECSS Standard. For dated
references, subsequent amendments to, or revision of any of these publications
do not apply. However, parties to agreements based on this ECSS Standard are

encouraged to investigate the possibility of applying the more recent editions of

the normative documents indicated below. For undated references, the latest
edition of the publication referred to applies.
EN reference Reference in text Title
EN 16601-00-01 ECSS-S-ST-00-01 ECSS system - Glossary of terms

EN 16003-31 ECSS-E-ST-31 Space engineering - Thermal control general requirements

EN 16003-40 ECSS-E-ST-40 Space engineering - Software
ISO 10303-11 (2004) Industrial automation systems and integration – Product
data representation and exchange – Part 11: The EXPRESS
language reference manual (second edition, 2004)
ISO 10303-21 (2002) Industrial automation systems and integration – Product
data representation and exchange – Part 21: Implementation
methods: Clear text encoding of the exchange structure
(second edition, 2002)
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Terms, definitions and abbreviated terms
3.1 Terms from other standards
a. For the purpose of this Standard, the terms and definitions from ECSS-S-
ST-00-01 apply.
b. For the purpose of this Standard, the terms and definitions from ECSS-E-
ST-31 apply, in particular for the following terms:
1. geometrical mathematical model
2. thermal mathematical model
c. For the purpose of this Standard, the terms and definitions from ECSS-E-
ST-40 apply, in particular for the following terms:
1. software component
3.2 Terms specific to the present standard
3.2.1 data exchange
process of transforming an exchange structure represented in a source format
into equivalent data expressed in a different target format.
NOTE 1 to entry This can be a multi-stage process transforming
from source format to a working data structure in
memory and then to the target format.
3.2.2 dataset

coherent and valid population conforming to the STEP-TAS schema (Annex A)
3.2.3 exchange structure
computer-interpretable format used for storing, accessing, transferring, and
archiving data.
NOTE 1 to entry This term is adopted from [ISO 10303]
3.2.4 interface

reader or writer
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3.2.5 population
set of STEP-TAS entities
NOTE 1 to entry A STEP-TAS dataset is an example of a population.
3.2.6 reader

software component which takes a STEP-TAS dataset as input, implements a
data exchange process and generates a target format.
3.2.7 source format
input to a data exchange process
NOTE 1 to entry The data can be in a file on disk or in memory
3.2.8 target format
output of a data exchange process
3.2.9 valid population
a population that has been successfully passed a validation
3.2.10 validation
process of checking that all algorithmic constraints are satisfied
NOTE 1 to entry In the terminology of [ISO 10303] and STEP-TAS
these algorithmic constraints are called “WHERE
rules”.
3.2.11 writer

software component which takes a source format as input, implements a data
exchange process and generates a STEP-TAS dataset.
3.3 Abbreviated terms
The following abbreviations are defined and used within this standard:
Abbreviation Meaning
application protocol
application programming interface
API
computer aided design
CAD
conformance class
central processing unit
CPU
geometrical mathematical model
GMM
International Organization for Standardization
ISO
meshed geometric model
MGM
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Abbreviation Meaning
network-model and results format
NRF
software development kit
SDK
space kinematic model
SKM
space mission aspects
SMA
standard for the exchange of product data
STEP
thermal analysis for space
TAS
thermal mathematical model
TMM
unified modelling language
UML
3.4 Nomenclature
The following nomenclature applies throughout this document:
a. The word “shall” is used in this Standard to express requirements. All
the requirements are expressed with the word “shall”.
b. The word “should” is used in this Standard to express recommendations.
All the recommendations are expressed with the word “should”.
NOTE It is expected that, during tailoring,
recommendations in this document are either
converted into requirements or tailored out.
c. The words “may” and “need not” are used in this Standard to express
positive and negative permissions, respectively. All the positive
permissions are expressed with the word “may”. All the negative
permissions are expressed with the words “need not”.
d. The word “can” is used in this Standard to express capabilities or
possibilities, and therefore, if not accompanied by one of the previous
words, it implies descriptive text.
NOTE In ECSS “may” and “can” have completely
different meanings: “may” is normative
(permission), and “can” is descriptive.
e. The present and past tenses are used in this Standard to express
statements of fact, and therefore they imply descriptive text.
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Overview of STEP-TAS
4.1 Introduction
STEP-TAS is a protocol for the exchange (or sharing) of data between parties
working in the domain of space thermal control engineering, over the whole life
cycle of space products. In particular this data includes:
• thermal analysis models, both Geometrical Mathematical Models (GMM)
and Thermal Mathematical Models (TMM),
• thermal analysis results (e.g. temperatures, nodal properties, heat flows),
• test data such as acquired temperature, electrical voltage or current, or
S/C telemetry,
• operational data such as S/C telemetry or ground station parameters
pertinent for thermal control engineers.
This document provides only a brief overview of the capabilities of STEP-TAS.
For the interested reader, a thorough discussion of STEP-TAS is given in Annex
The underlying technology upon which STEP-TAS is built is the ISO Standard
for the Exchange of Product model data [ISO 10303]. STEP can be used to
represent product data across a wide range of disciplines by means of dedicated
“Application Protocols” (APs). The best known AP is AP203 “Configuration
controlled 3D designs of mechanical parts and assemblies,” which is the STEP
format widely used for the exchange of CAD data.
The STEP standard uses a formal data modelling language called EXPRESS

[ISO 10303-11] to define data structures together with structural constraints and

algorithmic rules. The full STEP-TAS protocol, containing EXPRESS definition
of entities and human readable annotation, is provided in Annex C.
4.2 Modular breakdown of the STEP-TAS protocol
The STEP-TAS protocol is composed of the following four modules, each one
extending the previous one:
a. Network-model and results format (NRF) module,
b. Meshed geometric model (MGM) module,
c. Space kinematic model (SKM) module,
d. Space mission aspects (SMA) module.
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Each of these modules is kept as generic as possible, so in the protocol itself no

thermal control concepts are introduced. This opens the possibility of reuse of
the modules by other disciplines (e.g. space environment and effects).
In order to introduce the essential thermal control concepts used by STEP-TAS,
the core protocol described in the standard is complemented by a run-time
loadable dictionary. The dictionary contains a collection of pre-defined terms

relevant for thermal control, such as the definition of a thermal node, a thermo-

optical property or a linear conductor. A reference version of the dictionary can

be downloaded from the URI provided in Annex B and is also supplied with
the software tools.
NOTE The term run-time means that software tools
implementing a STEP-TAS interface can create and
initialize a new dataset with a known set of entities
read from the dictionary.
A UML package diagram showing composition of the full STEP-TAS protocol is
shown in Figure 4-1.
STEP-TAS
«uses»
STEP-TAS
Dictionary
NRF
«uses»
«import»
«uses»
MGM
«uses»
«import»
SKM
«import»
SMA
Figure 4-1: Informal UML Package Diagram showing STEP-TAS Dependencies
Each of the modules shown in Figure 4-1 is further broken down into sub-
modules which contain the data entities. The following list summarises the
contents of each module, with a full listing given in Annex C.
a. “Network-model and results format” (NRF) – generic engineering
discipline independent foundation module
1. identification and naming of objects,
2. dates, times, quantities and physical units,
3. network-model representation including hierarchical submodels,
4. parametrics (e.g. representation of TMM user logic),
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5. analysis, simulation, test or operational cases with runs and
results,
6. simple hierarchical product or system structure, referencing the
network model,
7. materials and material properties.
b. “Meshed geometric model” (MGM) – for analysis purposes based on
primitive mathematical shapes
1. thin shell with thermo-optical properties, bulk properties, notional
thickness and face activity,
2. hi
...

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