# Presentation: 659308

## STEP-TAS and its Benefits to Thermal Engineering

- STEP for Aerospace Workshop
- January 18, 2001
- Georg Siebes

## Outline

- STEP
- Zooming in on STEP-TAS
- STEP-TAS Detail
- The U.S. STEP-TAS Pilot
- What are the benefits

- GS - STEP-TAS

- January 18,  2001

## What is STEP

- STEP = STandard for the Exchange of Product model data 	= casual name for ISO 10303

***“******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.”***

- GS - STEP-TAS

- January 18,  2001

## STEP Architecture for Aerospace

**Documentation: PDF**

**Documentation: PDF, HTML**

**Propulsion: STEP-PRP**

**Propulsion: STEP-PRP**

**Mass-CoG-MoI: STEP-MCI (subset of AP214)**

**Mass-CoG-MoI: STEP-MCI (subset of ****AP214)**

**... ****(other discipline oriented protocols)**

**Fluid Dynamics (& other discipline oriented protocols)**

**Thermal analysis: STEP-TAS**

**Thermal analysis: ****STEP-TAS**

**system       product definition       analysis & simulation & test    results & delivery**

**ISO 10303**
**Industrial Automation **
**Systems - **
**Product representation **
**and exchange**

**ECSS**
**WG E-10-07**
**Exchange of **
**Product Data**

**In production use**

**Commercial implementation started**

**Final stages of development**

- STEP Architecture for Aerospace

- *European Cooperation for Space Standardization

- *

**You are**
**here**

- GS - STEP-TAS

- January 18,  2001

## What is STEP-TAS

- STEP-TAS = Thermal Analysis for Space

- Application Protocol for space missions and models used in thermal analysis.

- GS - STEP-TAS

- January 18,  2001

## Details of STEP-TAS

- 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
- properties

- GS - STEP-TAS

- January 18,  2001

## Details of STEP-TAS

- 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

- GS - STEP-TAS

- January 18,  2001

## Details of STEP-TAS

- Kinematic model conforms to STEP Part 105 for articulating rigid bodies (e.g. rotating solar arrays, gimballed antennas

- GS - STEP-TAS

- January 18,  2001

## Examples of STEP-TAS Exchanges

**ESARAD**

**Thermica**

**STEP-TAS**
**Viewer**

- GS - STEP-TAS

- January 18,  2001

## Examples of STEP-TAS Exchanges

**STEP-TAS**

**TSS**

**ESARAD**

**Thermica**

- (hand coded)

- GS - STEP-TAS

- January 18,  2001

## The U.S. STEP-TAS Pilot - Participants

- GS - STEP-TAS

- January 18,  2001

## 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,
- ...

- GS - STEP-TAS

- January 18,  2001

## Live Demo at NASA TFAWS Conference

- GS - STEP-TAS

- January 18,  2001

## Current STEP-TAS Implementation Status

**TRASYS**

*STEP-TAS*

**TSS**

**Thermal **
**Desktop (RadCad)**

**ESARAD**

**THERMICA**

**CORATHERM**

**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 planned*

*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

- GS - STEP-TAS

- January 18,  2001

## Benefit: Compliance with NASA Standard 2817

- 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 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.

- GS - STEP-TAS

- January 18,  2001

## Benefit: Significant reduction in translators

- ~ N2

- Point to Point Translators

- GS - STEP-TAS

- January 18,  2001

## Benefits of STEP - TAS

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

- GS - STEP-TAS

- January 18,  2001

## Benefits

- Demonstrate that ...
- 		.
- 		.
- 		Faster, Better, Cheaper
- 		reduced cycle time
- 		Art to Part
- 		faster time to market
- 		.
- 		.
- 					... are not just words

- GS - STEP-TAS

- January 18,  2001

## Remember STEP is ...

- S omething
- T o
- E mbrace
- P ermanently

- GS - STEP-TAS

- January 18,  2001