4 Information requirements

This clause specifies the information requirements for the Property distribution application module.

The information requirements are specified as a set of units of functionality, application elements, and application assertions. These assertions pertain to individual application entities and to relationships between application entities. The information requirements are defined using the terminology of the subject area of this application module.

1. - A graphical representation of the information requirements is given in annex C.
2. - The mapping specification is specified in 5.1 which shows how the information requirements are met using the integrated resources of this International Standard. The use of the integrated resources introduces additional requirements which are common to application modules and application protocols.

EXPRESS specification:

*)
SCHEMA Property_distribution_arm;
(*

4.1 Units of functionality

This subclause specifies the units of functionality (UoF) for the Property distribution application module as well as any support elements needed for the module definition. This part of ISO 10303 specifies the following units of functionality:

• Membership _of_ property_distribution;
• Property_distribution.

The units of functionality and a description of the functions that each UoF supports are given below.

4.1.1 Membership_of_property_distribution

The Membership_of_property_distribution UoF specifies:

• the relationship between a possession of property and a distribution of which it is a part.

  EXAMPLE - The total energy output of 'widget type XYZ' for the state 'widget type XYZ 10 seconds after the beginning of start up' is 1000 kW. This is a possession of property relationship between:

  • the state 'widget type XYZ 10 seconds after the beginning of start up'; and
  • the property value 1000 kW.

  The variation of energy output during the 'widget type XYZ start up' activity is a property distribution. The possession of property relationship with state 'widget type XYZ 10 seconds after the beginning of start up' is a member of this distribution.

The following application objects are used by the Membership_of_property_distribution UoF:

• Membership_of_property_distribution.

4.1.2 Property_distribution

The Property_distribution UoF specifies:

• a property distribution with respect to position within a product for a state;

  EXAMPLE - The temperature distribution within 'widget type XYZ at full power' is a property distribution. This is a function from each point within 'widget type XYZ at full power' to the temperature space.

• a property distribution with respect to state within an activity, for a whole product;

  EXAMPLE - The total energy output of 'widget type XYZ' during the 'widget type XYZ start up' activity is a property distribution. This is a function from each state within 'widget type XYZ start up' to the energy space.

• a property distribution with respect to position within a product and state within an activity;

  EXAMPLE - The temperature distribution within 'widget type XYZ' during the 'widget type XYZ start up' activity is a property distribution. This is a function from each point within 'widget type XYZ', for each state within 'widget type XYZ start up', to the temperature space.

• the relationship between one property space and another.

  EXAMPLE - The variation of Von Mise's stress with respect to stress tensor, is a property distribution. This is a function from the stress tensor space to the Von Mise's stress space.

  This may seem a curious example, but it is handled in exactly the same way as any other property distribution. In this case, the distribution is described by a simple analytical function.

The following application object is used by the Property_distribution UoF:

• Property_distribution.

4.2 Required AM ARMs

• Engineering_analysis_basics_arm;
• Possession_of_property_arm;
• Property_space_arm.

4.3 ARM type definitions

• none.

4.4 ARM entity definitions

• Membership_of_property_distribution
• Property_distribution

4.5 ARM rule definitions

• none.

4.6 ARM function definitions

• none.