1、 Reference number ISO 10303-108:2005(E) ISO 2005INTERNATIONAL STANDARD ISO 10303-108 First edition 2005-02-01 Industrial automation systems and integration Product data representation and exchange Part 108: Integrated application resource: Parameterization and constraints for explicit geometric prod
2、uct models Systmes dautomatisation industrielle et intgration Reprsentation et change de donnes de produits Partie 108: Ressources dapplication intgres: Paramtrage et contraintes pour les modles de produits gomtriques explicites ISO 10303-108:2005(E) PDF disclaimer This PDF file may contain embedded
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7、postale 56 CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyrightiso.org Web www.iso.org Published in Switzerland ii ISO 2005 All rights reservedISO10303-108:2005(E) Contents Page 1 S c o p e. 1 1 . 1 P a r a m e t e r i z a t i o ns c h e m a. 2 1 . 2 E x p l i c i tc o n s
8、 t r a i n ts c h e m a 3 1.3 Variational representation schema . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 1.4 Explicit geometric constraint schema . . . . . . . . . . . . . . . . . . . . . . . . . . 4 1 . 5 S k e t c hs c h e m a 4 2 N o r m a t i v er e f e r e n c e s. 4 3 Terms, d
9、enitions and abbreviations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 3 . 1 T e r m sd e n e di nI S O1 0 3 0 3 - 1 5 3 . 2 T e r m sd e n e di nI S O1 0 3 0 3 - 1 1 . 6 3 . 3 T e r m sd e n e di nI S O1 0 3 0 3 - 4 2 . 6 3 . 4 T e r m sd e n e di nI S O1 0 3 0 3 - 4 3 . 6 3 . 5
10、 T e r m sd e n e di nI S O1 0 3 0 3 - 5 0 . 7 3 . 6 T e r m sd e n e di nI S O1 3 5 8 4 - 2 0 . 7 3 . 7 O t h e rt e r m sa n dd e n i t i o n s 7 3 . 8 A b b r e v i a t i o n s. 1 4 4 P a r a m e t e r i z a t i o n . 1 5 4 . 1 I n t r o d u c t i o n 1 5 4.2 Fundamental concepts and assumptions
11、. . . . . . . . . . . . . . . . . . . . . . . . . 15 4 . 2 . 1 M o d e lp a r a m e t e r s . 1 6 4.2.2 Parameter binding to an instance attribute . . . . . . . . . . . . . . . . . . . . . 17 4.3 Parameterization type denitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 4.3.1 attri
12、butei d e n t i e r . 1 8 4.4 Parameterization entity denitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 4.4.1 modelp a r a m e t e r 1 9 4.4.2 bound modelp a r a m e t e r 2 0 4.4.3 unbound modelp a r a m e t e r. 2 2 4.4.4 bound parametere n v i r o n m e n t. 2 3 4.4.5 unbound p
13、arametere n v i r o n m e n t . 2 3 4.4.6 instance attributer e f e r e n c e 2 4 4.4.7 unbound model parameters e m a n t i c s. 2 5 4.4.8 xed instance attributes e t. 2 5 4.4.9 generated nite numerics p a c e 2 6 4.5 Parameterization function denitions . . . . . . . . . . . . . . . . . . . . . . .
14、 . . . 27 4.5.1 make numerics e t . 2 7 4.5.2 validate attributei d 2 8 5 E x p l i c i tc o n s t r a i n t. 3 0 5 . 1 I n t r o d u c t i o n 3 0 5.2 Fundamental concepts and assumptions . . . . . . . . . . . . . . . . . . . . . . . . . 31 5.2.1 Free-form and dened constraints . . . . . . . . . .
15、. . . . . . . . . . . . . . . 32 5.2.2 Simultaneous groups of constraints . . . . . . . . . . . . . . . . . . . . . . . . 32 5.2.3 Use of the current result in the resolution of ambiguities . . . . . . . . . . . . . 32 5.2.4 Directed and undirected constraints . . . . . . . . . . . . . . . . . . . .
16、 . . . . 33 5.2.5 Roles of model parameters in free-form constraints . . . . . . . . . . . . . . . . 33 5.2.6 Accuracy of constraint satisfaction . . . . . . . . . . . . . . . . . . . . . . . . . 34 c ISO2005AllrightsreservediiiISO10303-108:2005(E) 5.3 Explicit constraint type denitions . . . . . .
17、. . . . . . . . . . . . . . . . . . . . . . 34 5.3.1 constraint group member . 3 4 5.4 Explicit constraint entity denitions . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 5.4.1 explicit constraint . 3 4 5.4.2 denedc o n s t r a i n t . 3 5 5.4.3 equal parameterc o n s t r a i n t. 3 6 5.4.
18、4 free formc o n s t r a i n t 3 7 5.4.5 free forma s s i g n m e n t . 3 8 5.4.6 free formr e l a t i o n . 3 9 5.4.7 simultaneous constraintg r o u p. 4 0 6 V a r i a t i o n a lr e p r e s e n t a t i o n. 4 3 6 . 1 I n t r o d u c t i o n 4 3 6.2 Fundamental concepts and assumptions . . . . . .
19、. . . . . . . . . . . . . . . . . . . 43 6.3 Variational representation entity denitions . . . . . . . . . . . . . . . . . . . . . . . 45 6.3.1 variational representationi t e m 4 5 6.3.2 auxiliary geometric representationi t e m 4 6 6.3.3 variationalr e p r e s e n t a t i o n . 4 6 6.3.4 variation
20、al current representationr e l a t i o n s h i p 4 8 6.4 Variational representation function denitions . . . . . . . . . . . . . . . . . . . . . . 49 6.4.1 invalidate vrepi t e m 4 9 7 E x p l i c i tg e o m e t r i cc o n s t r a i n t. 5 2 7 . 1 I n t r o d u c t i o n 5 2 7.2 Fundamental concepts
21、 and assumptions . . . . . . . . . . . . . . . . . . . . . . . . . 52 7.2.1 Dimensional constraints . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54 7.2.2 Semantics of dimensional constraints . . . . . . . . . . . . . . . . . . . . . . . 55 7.2.3 Constraints on procedurally dened model
22、 elements . . . . . . . . . . . . . . . 56 7.3 Explicit geometric constraint type denitions . . . . . . . . . . . . . . . . . . . . . . 56 7.3.1 geometric constrainte l e m e n t. 5 6 7.3.2 point curve or surface constrainte l e m e n t. 5 7 7.3.3 curve or surface constrainte l e m e n t 5 7 7.3.4 l
23、inear geometry constrainte l e m e n t 5 7 7.3.5 radial geometry constrainte l e m e n t 5 7 7.3.6 axial geometry constrainte l e m e n t 5 8 7.3.7 swept surface ors o l i d. 5 9 7.3.8 tangent contactt y p e 5 9 7.3.9 parallel offsett y p e. 5 9 7.3.10 non negative lengthm e a s u r e . 6 0 7.4 Expl
24、icit geometric constraint entity denitions . . . . . . . . . . . . . . . . . . . . . 60 7.4.1 explicit geometricc o n s t r a i n t 6 0 7.4.2 xed element geometricc o n s t r a i n t 6 1 7.4.3 parallel geometricc o n s t r a i n t . 6 2 7.4.4 pgc withd i m e n s i o n 6 3 7.4.5 point distance geomet
25、ricc o n s t r a i n t 6 4 7.4.6 pdgc withd i m e n s i o n 6 5 7.4.7 skew line distance geometricc o n s t r a i n t . 6 5 7.4.8 near pointr e l a t i o n s h i p. 6 6 7.4.9 curve distance geometricc o n s t r a i n t 6 7 7.4.10 cdgc withd i m e n s i o n 6 9 7.4.11 surface distance geometricc o n
26、s t r a i n t. 6 9 7.4.12 sdgc withd i m e n s i o n 7 1 ivc ISO2005Allrightsreserved7.4.13 radius geometricc o n s t r a i n t 7 2 7.4.14 rgc with dimension 7 2 7.4.15 curve length geometricc o n s t r a i n t. 7 3 7.4.16 clgc with dimension 7 4 7.4.17 parallel offset geometricc o n s t r a i n t 7
27、 4 7.4.18 pogc withd i m e n s i o n 7 6 7.4.19 angle geometricc o n s t r a i n t. 7 7 7.4.20 agc withd i m e n s i o n 7 8 7.4.21 perpendicular geometricc o n s t r a i n t 7 9 7.4.22 incidence geometricc o n s t r a i n t 8 0 7.4.23 coaxial geometricc o n s t r a i n t 8 2 7.4.24 tangent geometri
28、cc o n s t r a i n t 8 2 7.4.25 symmetry geometricc o n s t r a i n t 8 4 7.4.26 swept point curve geometricc o n s t r a i n t 8 6 7.4.27 swept curve surface geometricc o n s t r a i n t. 8 7 7.4.28 curve segments e t. 8 8 7.4.29 curve smoothness geometricc o n s t r a i n t 8 9 7.4.30 surface patc
29、hs e t 9 0 7.4.31 surface smoothness geometricc o n s t r a i n t. 9 0 8 S k e t c h. 9 2 8 . 1 I n t r o d u c t i o n 9 2 8.2 Fundamental concepts and assumptions . . . . . . . . . . . . . . . . . . . . . . . . . 92 8 . 3 S k e t c ht y p ed e n i t i o n s 9 3 8.3.1 surface or solidm o d e l. 9 3
30、 8.3.2 planar curves e l e c t. 9 4 8.3.3 sketch elements e l e c t . 9 5 8.3.4 sketch basiss e l e c t. 9 5 8.3.5 sketch types e l e c t . 9 5 8.3.6 curves ora r e a. 9 6 8 . 4 S k e t c he n t i t yd e n i t i o n s . 9 6 8.4.1 implicit point onp l a n e 9 6 8.4.2 implicit planar intersectionp o i
31、 n t. 9 8 8.4.3 implicit planar projectionp o i n t 9 8 8.4.4 implicit planarc u r v e 9 9 8.4.5 implicit intersectionc u r v e.1 0 0 8.4.6 implicit projectedc u r v e1 0 0 8.4.7 implicit model intersectionc u r v e.1 0 1 8.4.8 implicit silhouettec u r v e1 0 1 8.4.9 neutral sketchr e p r e s e n t
32、a t i o n .1 0 2 8.4.10 positioneds k e t c h1 0 3 8.4.11 repositioned neutrals k e t c h 1 0 5 8.4.12 implicit explicit positioned sketchr e l a t i o n s h i p1 0 6 8 . 4 . 1 3 s u b s k e t c h1 0 7 8.4.14 rigids u b s k e t c h.1 0 8 8 . 5 S k e t c hf u n c t i o nd e n i t i o n s1 0 8 8.5.1 g
33、et relative direction2 p o i n t s .1 0 8 8.5.2 check curvep l a n a r i t y .1 0 9 8.5.3 get plane of implicitg e o m e t r y 1 1 0 Annex A (normative) Short names of entities . . . . . . . . . . . . . . . . . . . . . . . . . . 113 c ISO2005Allrightsreservedv ISO10303-108:2005(E)Annex B (normative)
34、 Information object registration . . . . . . . . . . . . . . . . . . . . . 115 B.1 D o c u m e n ti d e n t i c a t i o n .1 1 5 B . 2 S c h e m ai d e n t i c a t i o n.1 1 5 B.2.1 parameterization schemai d e n t i c a t i o n1 1 5 B.2.2 explicit constraint schema identication . . . . . . . . . .
35、. . . . . . . . . . . 115 B.2.3 variational representation schema identication . . . . . . . . . . . . . . . . . 115 B.2.4 explicit geometric constraint schema identication . . . . . . . . . . . . . . . . 116 B.2.5 sketchs c h e m ai d e n t i c a t i o n1 1 6 Annex C (informative) Computer interpre
36、table listings . . . . . . . . . . . . . . . . . . . . . 117 Annex D (informative) EXPRESS-G diagrams . . . . . . . . . . . . . . . . . . . . . . . . . 118 Annex E (informative) Technical discussions . . . . . . . . . . . . . . . . . . . . . . . . . . 137 E.1 Role of parameterization and constraints
37、 in procedural and hybrid representations . . . 137 E.2 Justication of representational choices made in this part of ISO 10303 . . . . . . . . 139 E.2.1 Non-binary constraints . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 139 E.2.2 The modelling of variational representations . . . .
38、 . . . . . . . . . . . . . . . 140 E.3 Application-related sketches with specic geometric forms . . . . . . . . . . . . . . . 141 A n n e xF( i n f o r m a t i v e ) E x a m p l e s.1 4 2 F.1 Examples of the intended usage of the ISO 10303-108 mechanism for linking param- eters with attributes of en
39、tity instances . . . . . . . . . . . . . . . . . . . . . . . . . . 142 F . 1 . 1 E x a m p l e1.1 4 2 F . 1 . 2 E x a m p l e2.1 4 4 F.1.3 Relationship between ISO 10303-108 and ISO 13584-20 . . . . . . . . . . . . . 145 F.2 Example of a two-dimensional sketch . . . . . . . . . . . . . . . . . . . .
40、 . . . . . . 147 F.3 Usage of ISO 10303-108 for the representation of incompletely dened models . . . . 148 B i b l i o g r a p h y .1 5 1 I n d e x .1 5 2 Figures Figure 1 Schema level diagram of relationships between ISO 10303-108 schemas (inside the b o x )a n do t h e rr e s o u r c es c h e m a
41、 s. x i Figure 2 Schema level diagram of relationships among ISO 10303-108 schemas . . . . . . . xii Figure 3 Embedding of a current result representation in a variational representation. 4 5 Figure D.1 EXPRESS-G diagram of the parameterization schema (1 of 2) . . . . . . . . . . . 119 Figure D.2 EX
42、PRESS-G diagram of the parameterization schema (2 of 2) . . . . . . . . . . . 120 Figure D.3 EXPRESS-G diagram of the explicit constraint schema (1 of 1) . . . . . . . . . . . 121 Figure D.4 EXPRESS-G diagram of the variational representation schema (1 of 1) . . . . . . . 122 Figure D.5 EXPRESS-G di
43、agram of the explicit geometric constraint schema (1 of 10) . . . . 123 Figure D.6 EXPRESS-G diagram of the explicit geometric constraint schema (2 of 10) . . . . 124 Figure D.7 EXPRESS-G diagram of the explicit geometric constraint schema (3 of 10) . . . . 125 Figure D.8 EXPRESS-G diagram of the ex
44、plicit geometric constraint schema (4 of 10) . . . . 126 Figure D.9 EXPRESS-G diagram of the explicit geometric constraint schema (5 of 10) . . . . 127 Figure D.10 EXPRESS-G diagram of the explicit geometric constraint schema (6 of 10) . . . . 128 Figure D.11 EXPRESS-G diagram of the explicit geomet
45、ric constraint schema (7 of 10) . . . . 129 Figure D.12 EXPRESS-G diagram of the explicit geometric constraint schema (8 of 10) . . . . 130 Figure D.13 EXPRESS-G diagram of the explicit geometric constraint schema (9 of 10) . . . . 131 vic ISO2005Allrightsreserved ISO10303-108:2005(E)Figure D.14 EXP
46、RESS-G diagram of the explicit geometric constraint schema (10 of 10) . . . 132 Figure D.15 EXPRESS-G diagram of the sketch schema( 1o f4 ).1 3 3 Figure D.16 EXPRESS-G diagram of the sketchs c h e m a( 2o f4 ).1 3 4 Figure D.17 EXPRESS-G diagram of the sketch schema( 3o f4 ).1 3 5 Figure D.18 EXPRES
47、S-G diagram of the sketchs c h e m a( 4o f4 ).1 3 6 Figure F.1 Key relationships between ISO 10303-108 parameterization schema and ISO 13548 generic expressions schema .1 4 6 Figure F.2 A simple sketch composed of line segments and circular arcs . . . . . . . . . . . . 147 Tables A . 1 S h o r tn a
48、m e so fe n t i t i e s.1 1 3 c ISO2005Allrightsreservedvii ISO10303-108:2005(E)Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through
49、ISO technical committees. Each member body interested in a subject for which a technical com- mittee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical stan- dardization. International Standards are drafted in accordance with the rules given in the ISO
