ISO/PDTS 10303-1076 was prepared by Technical Committee ISO/TC 184, Industrial automation systems and integration, Subcommittee SC4, Industrial data.
This International Standard is organized as a series of parts, each published separately. The parts of ISO 10303 fall into one of the following series: description methods, integrated resources, application inter-preted constructs, application modules, application protocols, abstract test suites, implementation methods, and conformance testing. The series are described in ISO 10303-1. A complete list of parts of ISO 10303 is available from the Internet:
http://www.nist.gov/sc4/editing/step/titles/.
Annexes A and B form an integral part of this part of ISO 10303. Annexes, C, D, E, aand F are for information only.
For each product, there is a set or space of points that are within its body. Each member of this set or space can be identified by a parametric space.
NOTE - The terms set, space and class are synonyms. A product design is a class, with individual product that comply with the design as members. A space of points within a product is a class that has individual points within a product as members.
EXAMPLE - The product design that is 'widget type XYZ' has a corresponding space of points. The space of points within widget type XYZ can be parameterised by a unit cube within the space of real triples, so that each individual point is identified.
A temperature distribution within widget type XYZ can be described by a mathematical function over the unit cube.
For some products, there are useful sets of features such as fibres or planes, as follows:
for a beam or duct there is a space of planes (cross sections) that are normal to the reference curve in a reference state;
There are aggregate properties for a cross section of a beam, such as shear force and bending moment. There are aggregate properties for a cross section of a duct, such a mass flow rate and average temperature.
EXAMPLE - The beam that is XB_01 has a corresponding space of cross sections. This space of cross sections can be parameterised by the real interval [0, 1], so that each cross section can be identified.
A distribution of bending moment within XB_01 can be described by a mathematical function over the unit interval.
for a shell there is a space of fibres that are normal to the reference surface in a reference state.
EXAMPLE - The shell that is P_02 has a corresponding space of normal fibres. This space of fibres can be parameterised by a square in the space of real pairs, so that each fibre can be identified.
A distribution of shell bending moment (a second order tensor in 2D) over P_02 can be described by a mathematical function over the unit square.
For a finite volume or lumped parameter analysis, a product has a finite set of sub-bodies.
EXAMPLE - The volume of space within 'my duct' is a product. This product has a corresponding finite set of cubic volumes. This finite space can be parameterised by the integer interval [1, n] or by a space of integer triples (i, j, k), so that each cubic volume can be identified.
A distribution of the average pressure, average velocity and average temperature for each cube can be described by a mathematical function over the integer interval or space of integer triples. This mathematical function can be a straightforward enumeration of the values for each point in the domain.
The use of a 'space of features' for an analysis, rather that a space of points is called 'dimensional reduction' (it reduces the dimension of the parameter space).
In order to relate different analyses carried out using different dimensional reductions, it is necessary to define the corresponding function between the different parameter spaces.
This application module support the definition of a space of points or space of features with a product.
The following are within the scope of this application module:
the relationship between a product and a space of points or features;
the nature of a space of points or features (i.e. whether points, fibres, cross sections or finite volumes);
the function between different spaces of points, fibres, cross sections or volumes for the same product (i.e. the relationship between different dimensional reductions).
The following are not within the scope of this application module:
a mathematical space that parameterises a space of points or features.
NOTE - A parameterisation relationship between a product feature space and a mathematical space is defined in the product activity and state space parameterisation module.
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