ISO/TS 8000-311:2012

TECHNICAL ISO/TS
SPECIFICATION 8000-311
First edition
2012-04-15
Data quality —
Part 311:
Guidance for the application of product
data quality for shape (PDQ-S)
Qualité des données —
Partie 311: Directives pour l'application de la qualité des données de
produit pour les formes (PDQ-S)

Reference number
©
ISO 2012
©  ISO 2012
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means,
electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or
ISO's member body in the country of the requester.
ISO copyright office
Case postale 56  CH-1211 Geneva 20
Tel. + 41 22 749 01 11
Fax + 41 22 749 09 47
E-mail copyright@iso.org
Web www.iso.org
Published in Switzerland
ii © ISO 2012 – All rights reserved

Contents                                  page

1. Scope . 1
2. Normative references . 2
3. Terms, definitions and abbreviated terms . 3
3.1 Terms and definitions . 3
3.1.1 application . 3
3.1.2 application protocol . 3
3.1.3 application reference model . 3
3.1.4 data exchange . 3
3.1.5 product . 3
3.1.6 product data . 3
3.1.7 accuracy . 4
3.1.8 inspection result . 4
3.1.9 measurement requirement . 4
3.1.10 product data quality . 4
3.1.11 product shape data . 4
3.1.12 quality criterion . 4
3.1.13 threshold . 5
3.1.14 inspection . 5
3.1.15 quality . 5
3.1.16 quality requirement . 5
3.2 Abbreviated terms . 5
4. Overview of PDQ-S . 6
4.1 Purpose, approach and expected usage scenarios . 6
4.2 Structure of ISO 10303-59 . 6
4.3 PDQ-S schema structure . 7
4.4 Target shape model . 8
4.5 Relationship between ISO 10303-59 and other International Standards dealing with nominal
representation of product data . 8
4.6 Major characteristics of PDQ-S . 10
4.6.1 Quality criteria of three dimensional shape data . 10
4.6.2 Enabler of better association between PDQ checking systems and healing systems . 10
4.6.3 Standardization of the external specifications of quality checking algorithms . 11
4.6.4 Optimization of data quality check environment by the user . 11
4.6.5 Extensibility to non-shape product data quality problems . 12
5. Considerations for facilitating the use of PDQ-S . 13
5.1 General . 13
5.2 Relationship between product data quality problems and quality criteria . 13
5.2.1 Types of product data quality problem . 13
5.2.2 B-rep is not appropriate (erroneous_data) . 13
5.2.3 Accuracy of B-rep is not satisfactory . 13
5.2.4 Shape manipulation process by CAX systems fails . 15
5.3 Examples of selecting data quality criteria for practical engineering purposes . 17
5.3.1 Overview of the example scenarios . 17
5.3.2 A scenario of product data exchange during digital assembly . 17
5.3.3 A scenario of product data exchange during collaborative product development by an
assembly manufacturer and parts suppliers . 18
5.3.4 A scenario of product data exchange during production equipment/die development
aiming at machining dies . 18
5.4 Recommended procedure for promoting PDQ activity . 20
6. Ensuring conformance with PDQ-S . 22
6.1 General . 22
6.2 Underlying concepts of PDQ-S . 22
6.2.1 Usage scenarios of PDQ-S . 22
6.2.2 Relationship between a product data and its data quality information . 23
6.3 Two methods of using PDQ-S . 25
6.4 Modifying existing APs in order to make them PDQ-S conformant . 26
6.4.1 General . 26
6.4.2 Extension of an existing AP with PDQ-S modules . 26
6.4.3 PDQ-S modules . 26
6.4.4 Proposed procedure for creating a PDQ-S conformant AP . 27
Annex A (normative) Information object registration . 29
A.1 Document identification. 29
Annex B (informative) Technical discussion . 30
B.1 Background . 30
B.2 Definition of product data quality . 30
Annex C (informative) Comparison of ISO 10303-59 and ISO/PAS 26183 . 32
C.1 Similarity . 32
C.2 Difference . 32
C.1.1 Representation method . 32
C.1.2 Target industry . 32
C.1.3 Target data type . 32
Annex D (informative) Instantiation examples . 33
D.1 General . 33
D.2 Graphical notation for instances . 33
D.3 Instances for short_length_edge . 34
D.4 Instances for gap_between_edge_and_base_surface . 55
Bibliography . 59
Index . 61
Figures
Figure 1 — Structure of PDQ-S schemas . 8
Figure 2 — Schema level diagram of relationships between PDQ-S schemas (inside the box) and other
resource schemas . 9
Figure 3 — Dragging a self-intersecting string into a line . 16
Figure 4 — Relation between product data quality information in PDQ-S and product model data . 24
Figure 5 — An approach to modifying existing APs in order to make them PDQ-S conformant . 25
Figure 6 — Conceptual scheme of extension of AP using PDQ-S module . 27
Figure B. 1 — Quality of product, product model and product data . 31
Figure D.1 — Example usage of the notation . 34
Figure D.2 — A typical example of short length edge . 35
Figure D.3 — Example instances of quality information for use in requirement or declaration of
short_length_edge without specified accuracy (1 of 3) . 36
Figure D.4 — Example instances of quality information for use in requirement or declaration of
short_length_edge without specified accuracy (2 of 3) . 37
iv © ISO 2012 – All rights reserved

Figure D.5 — Example instances of quality information for use in requirement or declaration of
short_length_edge without specified accuracy (3 of 3) . 38
Figure D.6 — Example instances of quality information for use in the improvement of quality of
short_length_edge (1 of 8) . 44
Figure D.7 — Example instances of quality information for use in the improvement of quality of
short_length_edge (2 of 8) . 45
Figure D.8 — Example instances of quality information for use in the improvement of quality of
short_length_edge (3 of 8) . 46
Figure D.9 — Example instances of quality information for use in the improvement of quality of
short_length_edge (4 of 8) . 47
Figure D.10 — Example instances of quality information for use in the improvement of quality of
short_length_edge (5 of 8) . 48
Figure D.11 — Example instances of quality information for use in the improvement of quality of
short_length_edge (6 of 8) . 49
Figure D.12 — Example instances of quality information
...