STEP, the grand experience

200 Pages·1999·11.3 MB·English

by  Kemmerer, Sharon J.

NIST Special Publication 939
Grand Experie
The
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DATE DUE
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Edited by
I
Kemmerer
Sharon
J.
Manufacturins Ensineerins Laboratory
National Institute of Standards and Technolc
MD 20899-0001
Gaithersburs,
July 1999
UNIVERSITY PRODUCTS, INC. #859-5503
U.S. Department of Commerce
William M. Daley
Technolosy Administration
Gary R. Bachula, Under Secretary for Technolosy
National Institute of Standards and Technolosy
Raymond G. Kammer, Director
National Institute of Standards U.S. Government Printins Office For sale by the Superintendent
and Technolosy Washinston: 1999 of Documents
Special Publication 939 U.S. Government Printing Office
Natl. Inst. Stand. Technol. Washington, DC 20402
Spec. Publ. 939
187 pages (July 1999)
CODEN: NSPUE2
DEDICATION
Becausethis Product DataExchangeefforthas already crossed into itsthirddecade, the United States
standardization participantshave feUthe unfortunate loss oftheircolleagues. Many ofthese individualswere still
active contributorstothenational and international efforts whenthey died. This dedication serves as a small token
ofourappreciation fortheirprofessional contributionstothe national and internationalproductdataexchange
standardization efforts, and fortheirpersonal contributions intouchingour lives.
Robert Colsher
(IGES)
William Conroy
(IPO Chair, NIPDE General Manager, US TAG Chair)
Bert Gibbons
(Electrical/Electronics)
Dick Justice
TAG
(US Chair)
Bryan Martin
(Validation)
Richard Winfrey
(Presentation)
Timothy Wise
Liaison for TC172/SC1 and TC184/SC4AVG3/T9
ill

1
TABLE OF CONTENTS
DEDICATION
iii
CHAPTER INTRODUCTION
1
1.1 Background - 1
1.2 DocumentApproach 2
1.3 DocumentContent - — 3
1.4 Audience - 5
1.5 Disclaimerforthis Document 5
CHAPTER2 IN THE BEGINNING... THERE WAS PRODUCTDATA EXCHANGE 7
2.1 Evolution ofProductInformation Sharing ~ 7
2.2 Early Contributing Efforts 9
2.3 OtherInternational Players - 14
2.4 The PDES Initiation Effort 15
2.5 How didElectrical ContentFind its Way into STEP? 16
2.6 Legacyto STEP 19
2.7 Conclusion 20
CHAPTER3 STEP DEVELOPMENT-- CYCLES OF CONSENSUS 23
3.1 Introduction 23
3.2 The Beginning ofSTEP 23
3.3 The PDES Initiation Effort 25
3.4 The Integrated Product Information Model (IPIM) 28
3.5 Context Driven Integrated Models (CDIMs) 31
3.6 The Integration Models ofthe PDES Integration Task Group - 3
3.7 ISO Recognizes the Concept ofApplication Protocols (APs) 33
3.8 So Can We Build a STEP Planning Model? 34
3.9 The Generic Product Data Model (GPDM) - 35
3.10 The Comical, The Technical, and The Inspired 37
3.1 1 Count Down to Blast Off... the Initial Release ofISO 10303 41
3.12 No Timeto RestAfter Intial Release 43
3.13 Conclusion 45
CHAPTER4 THE BUILDING BLOCKS OFSTEP 47
4.1 Challenges for STEP - 47
4.2 Components ofISO 10303 48
4.3 STEP Methodology 54
4.4 Architectural Issues Facing STEP 57
4.5 Conclusion - 58
CHAPTER5 MODELING-A WAY TO PRESENT PRODUCT DATA REQUIREMENTS 61
5.1 The Role ofan Information Model forData Sharing 61
5.2 RobustModeling is Crucial to STEP 61
5.3 Modeling Alternatives 61
5.4 Modeling Information ~ What'sNeeded 65
5.5 Whydid EXPRESS Come into Existence? 65
5.6 Modeling and STEP 66
5.7 Contributions ofSTEPto Modeling 66
-
5.8 In Practice - 67
5.9 EXPRESS-A Computer-Interpretable Language 68
5.10 EXPRESS andValidation 69
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3
5.11 WhatCanbe Generated? 72
5.12 MinorAnnoyances 73
5.13 Conclusion-- 73
CHAPTER 6 SHARING VERSUS EXCHANGING DATA 75
6.1 Introduction 75
6.2 Data Exchange inthe ContextofSTEP 75
6.3 Data Sharing in theContext ofSTEP 76
6.4 Sharing Data& Exchanging DataCompared 77
6.5 STEP Implementa—tion Levels 77
6.6 SDAI Evolution 78
6.7 SDAI -IntendedPurpose 79
6.8 SDAI and its Family ofStandards 80
6.9 SDAl's Compatibility with EXPRESS -— 80
—
6.10 SDAI Support forApplication Protocols 82
6.11 Contrasting ISO 10303-21 with ISO 10303-22 82
6.12 Implementation Classes in ISO 10303-22 82
6.13 Testing for SDAI 83
6.14 Conclusion 83
CHAPTER 7 THE USER PERSPECTIVE 85
7.1 Background on Application Protocols 85
7.2 Purpose and Principles ofApplication Protocols 85
7.3 Components ofan Application Protocol 86
7.4 Developing an Application Protocol 91
7.5 Planning andManaging AP Projects 93
7.6 Conclusion 94
CHAPTER8 CONFORMANCE AND INTEROPERABILITY TESTING 97
8.1 Introduction 97
8.2 Testing 98
8.3 Conformance TestingVersus Interoperability Testing 99
8.4 Developing Conformance Testing Methodologies forISO 10303 101
8.5 STEP Conformance Requirements 103
8.6 Conformance Testing STEP Implementations 103
8.7 Interoperabilty TestingofISO 10303 Implementations 104
8.8 Formal Certification ofProducts 109
8.9 Testing Benefits and Costs 110
8.10 Conclusion - Ill
CHAPTER9 MANAGING THE PROCESS TO ACHIEVE THE PRODUCT~ STANDARDS 113
9.1 OurMeans to an End~ Organizing and Operating SC4 11
9.2 Exploitation ofInformation Technology 121
9.3 Leveraging Human Resources — 126
9.4 Conclusion 127
CHAPTER 10 THE FUTURE OF STEP 129
10.1 STEP Development 129
10.2 Data Sharing 132
—
10.3 EXPRESS 133
10.4 UpwardCompatibility 134
10.5 Interoperability 134
10.6 Change Management 135
10.7 Archival Requirements Impacting Step 136
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10.8 EngineeringAnalysis 137
10.9 Design IntentandParametrics 138
10.10 Standard Parts 139
10.11 Electronics 139
10.12 SupplyChain 141
10.13 ProductDataManagement 142
10.14 RapidPrototyping 143
10.15 STEPProduct Support 144
10.16 Interfacing With OtherGroups and Standards r 145
10.17 Conclusion 149
CHAPTER 11 EPILOGUE 151
APPENDICES
APPENDIXA ACRONYMS 155
APPENDIX B GLOSSARY OF TERMS 159
APPENDIX C REFERENCES 165
APPENDIX D ABOUTTHE AUTHORS... 171
BIBLIOGRAPHY 177
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