標準號：ISO 10303-108-2005
中文標準名稱：工業(yè)自動化系統(tǒng)和集成.產品數(shù)據(jù)表示和交換.第108部分:集成應用資源:顯示幾何產品模件用參數(shù)化和約束條件
英文標準名稱：Industrial automation systems and integration - Product data representation and exchange - Part 108: Integrated application resource: Parameterization and constraints for explicit geometric product models
標準類型：N18
發(fā)布日期：2005/2/1 12:00:00
實施日期：1999/12/31 12:00:00
中國標準分類號：N18
國際標準分類號：25.040.40
適用范圍：This part of ISO 10303 specifies the resource constructs for the representation of model parametersand constraints, together with the mechanisms necessary for associating them with geometric or otherelements of transferred models. The use of these capabilities potentially allows certain aspects of thebehaviour of a model in its originating system to be conveyed together with the basic model itself. Theintention in transferring this additional information is to provide the receiving system with data that willenable it to reconstruct corresponding behavioural characteristics in the model following the transfer.Ideally, this will enable the model to be edited in the receiving system just as as though it had beencreated there. That would not be possible without the exchange of what is known as design intentinformation. This part of ISO 10303 enables the capture and transfer of an important aspect of designintent.Clause 4 defines a means for the association of model parameters with individual quantities in the model,to provide for the editing of dimensional values and other variable attributes. Clause 5 provides for themodelling of constraint relationships in terms of mathematical relationships among model parameters.Such constraints are not restricted to the modelling of product shape; they are designed to be applicablein any situation where it may be useful to capture and transfer mathematically specified relationships.Clause 5 also defines a class of descriptive (non-mathematical) constraints. Clause 6 defines avariationalrepresentation, containing a model together with all the associated parameters and constraints that potentiallyfacilitate its effective editing following a transfer. Clause 7 defines specialized representations for aset of explicit geometric constraints applicable specifically to elements of shape models of the boundaryrepresentation and closely related types. These are subtypes of the descriptive constraints specified inclause 5. Finally, clause 8 provides representations for two-dimensional sketches, which form the basisof many shape construction methods in CAD modelling. Sketches are an important application area forthe parameterization and constraint information defined in earlier clauses. The capabilities provided inthis schema may also be used as a basis for the representation of parameterized drawings.The following are within the scope of this part of ISO 10303:— Parameterization of models through the association of variables with quantities occurring in them;— Constraints defining mathematical relationships between parameters;— Constraints on models expressed as relationships between their constituent elements or attributes ofthose elements;— Association of parameters and constraints with models at therepresentation level, to create variationalmodels of products, plans, processes or organizations;