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Using STEP in exchange of digital product information.

Using STEP in exchange of digital product information. Ing. Martin Molhanec, CSc. What is STEP?. Maybe?. No ! The STEP is . ST andard for E xchange of P roduction data. It is the ISO standard ( ISO 10303 ).

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Using STEP in exchange of digital product information.

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  1. Using STEP in exchange of digital product information. Ing. Martin Molhanec, CSc.

  2. What is STEP?

  3. Maybe?

  4. No ! The STEP is  • STandard for Exchange of Production data. • It is the ISO standard (ISO 10303). • The STEP standard is supporting geometry, topology, relationship, attributes, assemblies and configuration of product management data.

  5. The STEP has many parts.

  6. Description Methods • Explain how to describe the REAL WORLD – the production data. • Based on software engineering analytics methods. • Object Oriented paradigma. • EXPRESS language (ISO 10303-11).

  7. Example of description SCHEMA materials; ENTITY linear_material; name : STRING; young_modulus : REAL; coef_thermal_expansion : REAL; shear_modulus : REAL; yield_stress : REAL; ultimate_stress : REAL; poissons_ratio : REAL; END_ENTITY; END_SCHEMA (* materials *);

  8. Implementation Methods • Describe the mapping from STEP formal specifications (EXPRESS language) to a representation used to implement STEP • At present time exist following ISO 10303 parts: • 21 (STEP file format) • 22 (Abstract STEP Data Access Interface – SDAI) • 27 (Java™ language-based SDAI) • 28 (STEP data in XML) products are under development

  9. STEP file format ISO-10303-21; HEADER; /*---------------------------------------- * Exchange File generated by ST-DEVELOPER v1.4 * Conforms to ISO 10303-21 */ FILE_DESCRIPTION ((''), '1'); FILE_NAME ('materials_data', '1996-07-01T12:13:37-04:00', (''), (''), 'ST-DEVELOPER v1.4', '', ''); FILE_SCHEMA (('MATERIALS')); ENDSEC; DATA; #10 = LINEAR_MATERIAL ('Alumina', $ , 0.0000067, $ , $ , $, $ ); #20 = LINEAR_MATERIAL ('Ceramic', $ , 0.0000003, $ , $ , $, $ ); ENDSEC; END-ISO-10303-21;

  10. Application Protocols • The STEP Parts known as Application Protocols (AP’s, part series 2xx) define formal models in a designated application area. • Some examples of protocols • AP203: Configuration controlled design • AP210: Electronic assembly, interconnect and packaging design • AP212: (Electrotechnical design and installation)

  11. EXPRESS language • Object oriented • Human readable • Computer interpretable • Overall structure is similar to OOPL (object oriented program language) • Data model is similar to ERM (Entity-relationship model)

  12. EXPRESS language • EXPRESS-C (EXPRESS with static and behavioural modelling capabilities) • EXPRESS-G (Graphical language) • EXPRESS-I (Instantiation language) • EXPRESS-M (Mapping definition language) • EXPRESS-P (Process definition language) • EXPRESS-V (Extension of EXPRESS which enables the creation of views) • EXPRESS-X (Merger of M and V)

  13. Example of EXPRESS-G (Graphical language)

  14. Simple example

  15. EXPRESS language(description of point) ENTITY Point; x: REAL; y: REAL; END_ENTITY;

  16. EXPRESS language(description of 3D point) ENTITY Point3D SUBTYPE OF (Point); z : REAL; END_ENTITY;

  17. EXPRESS/STEP tools • WinSTEP (Version 3.0) • University of the Federal Armed Forces • J-SDAI • LKSoftWare GmbH • NIST Expresso • National Institute for Standards and Technology • EzExpress • free

  18. EzExpress (editor for STEP definition files)

  19. JSDAI STEP – Book AP210

  20. CONCLUSION • The aim of this article was a brief explanation of STEP standard and EXPRESS language. • The STEP standard is the most important development in the area of an exchange of production data between different producers. • The STEP standard is supported by U.S.A. government and many of the most major worldwide producers e.g. General Electric, etc.

  21. CONCLUSION • Ourprojects in the area of using the STEP/EXPRESS standard. • educational  put basic information about this standard in the courses • research using the STEP/EXPRESS standard in the area of the packaging

  22. Ing. Martin Molhanec, CSc. Czech Technical University Faculty of Electrical Engineering Department of Electrotechnology Technicka 2 166 27 PRAHA 6 Tel:. ++420 (2) 2435 2118 Email: molhanec@fel.cvut.cz WWW: http://martin.feld.cvut.cz/~mmm

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