1、 GEIA STANDARD GEIA-STD-927 Common Data Schema for Complex Systems GEIA-STD-927 June 2007 GOVERNMENT ELECTRONICS AND INFORMATION TECHNOLOGY ASSOCIATION A Sector of the Electronic Industries Alliance Copyright Government Electronics provides a way for stakeholders to understand their needs in relatio
2、n to the enterprise as a whole; and provides a continuous proactive means of identifying and successfully addressing key challenges for a complex system over time. The third is an evolved culture where enterprise-wide cooperation is the rule and individual contributions are encouraged and efficientl
3、y managed. This GEIA-STD-927 standard specifies the multi-domain data schema as described in the first bullet point above. The remaining two bullet points involve software and user implementation. NOTE: Within the standard, the terms system and product are synonymous.iii Copyright Government Electro
4、nics technical management (work schedule, document generation, concurrent engineering, validation, and verification procedures); project aspects which include project management issues (traceability management, configuration management, and trade-off analysis); industrial management (management of c
5、o-operation between partners). The following discipline views are within the scope of GEIA-STD-927: definition of other systems the system interacts with; context for the system in each life cycle phase; support of hierarchical break down modeling techniques; functional and non-functional requiremen
6、ts of the system in each life cycle phase; definition of the static and dynamic behavior of the system. The following life cycle aspects are within the scope of GEIA-STD-927: systems engineering; feasibility assessment; requirements definition; domain engineering; system realization; system operatio
7、n; system support; system maintenance; decommissioning of the system. 1 Copyright Government Electronics data to specify requirements of the system and their allocation to functional objects, physical objects, and the physical implementation; data to specify the static behavior of the system in term
8、s of functions and flows between functions; data to specify dynamic behavior of the system; data to describe the functional decomposition of the system; data to support the physical architecture; data to support the partitioning of the system; data to support the verification and validation of the s
9、ystem; data to specify the installation of the equipment, including physical locations and information; data about the shape of the equipment data to support project and industrial management; data to support the documentation of the system data to support configuration management; data used in doma
10、in engineering; data used in feasibility assessment; data used in system realization; data used in and for system operation; data used for system maintenance; data used for decommissioning of the system. 2 Copyright Government Electronics for example this object could represent all versions of user
11、manuals for a word processing product Documentation_assignment assignment of documentation to any object in the model Documentation_version collection of information about an object which is under version control, the collection may be large or small, simple or complex; for example this object could
12、 represent version 6.0 of a user manual for a word processing product Documentation_definition representation of documentation in a particular format Subtypes of documentation_definition o Physical_document_definition hardcopy documentation o Digital_document_definition digital documentation Drawing
13、 the presentation of an object in a human interpretable form wherein the physical and functional requirements for that object are presented by pictures or text Drawing_assignment a mechanism to associate a drawing with the object that is presented on the drawing 7 Copyright Government Electronics th
14、is time period may be bounded with an event, a start date/time, and/or a duration of time Event start or end of an activity Period_in_time all space for a part of time; for example, the period from 0600 2000-11-21 to 1153 2000-11-21 can represented by an instance of period_in_time 9 Copyright Govern
15、ment Electronics e.g., 00 and 01 are assigned to the United States. The NIIN does not follow a logical sequence as the FSG and FSC do. The same NIIN is never used for more than one FSC at the same time. The NSNs are assigned by DLIS at Battle Creek, Mich., based on requests from the armed services b
16、ranch using the item. Normally, items are 11 Copyright Government Electronics e.g., 00 and 01 are assigned to the United States. The NIIN does not follow a logical sequence as the FSG and FSC do. The same NIIN is never used for more than one FSC at the same time. The NSNs are assigned by DLIS at Bat
17、tle Creek, Mich. based on requests from the armed services branch using the item. Normally, items are assigned an NSN if requisitioned three times by more than one activity using a manufacturers code and part number (non-NSN) for identification. o NSN the 13-digit National Stock Number or NSN that i
18、dentifies a specific federal_supply_item. Built on the military model, its made up of: The first 2 digits, the Federal Supply Group (FSG), which identify the property group the item belongs in. 14 Copyright Government Electronics connection objects may be used to divide a network in portions that ca
19、n be implemented by using a specified equipment Physical_instance occurrence of a transfer or transformation mechanism in a product /system specification Physical_configuration collector for all physical_instance objects that apply for a particular physical view of a product/system Physical_connecti
20、vity_definition the specification of the ability to enable a flow of information, energy, or material within a piece of equipment Subtypes of physical_connectivity_definition o Terminal_connection a type of physical_connectivity_definition that is a link between single or bundled terminal objects wi
21、th the intention to allow the flow of information, energy, or matter. Connection objects may be used to divide a network in portions that can be implemented by using a specified equipment o Interface_connection a type of physical_connectivity_definition that may be used to link single or bundled phy
22、sical_port_definition objects. The interface_connection allows one to specify the inner connectivity between the 17 Copyright Government Electronics for example all the information about the 1980 Ford Fairlanes for the domestic market Subtypes of system_definition Requirement_occurrence the specific
23、ation of a requirement in the context of a requirement decomposition structure Realized_system the reference to a physically realized system produced in accordance with a specification identified by the realization_of attribute. For example vehicle number 123234 from production run 5 of the white Fo
24、rd Fairlanes with red leather interior and automatic transmissions for the domestic market System_instance depiction of a product specification in a particular context, for example production run 5 of the white Ford Fairlanes with red leather interior and automatic transmissions for the domestic mar
25、ket System_relationship relationship between two system_view objects 19 Copyright Government Electronics & Information Technology Association Provided by IHS under license with GEIA Not for ResaleNo reproduction or networking permitted without license from IHS-,-,-GEIA-STD-927 System_source relation
26、ship between a product and the objects representing the source of the product System_view_assignment relation in which a partial_system_view object is assigned to a system_definition object. A product/system may be represented by the combined contents of many partial views which respectively cover v
27、iewpoints such as physical composition, budget and schedule, concept of operations, user ergonomics, information security, and/or a wealth of others. This assignment relation ties the many product/system viewpoints to a common system specification System_instance_to_realized_system relation which sp
28、ecifies the system_instance that provided the specification for the realization of the realized_system. 20 Copyright Government Electronics & Information Technology Association Provided by IHS under license with GEIA Not for ResaleNo reproduction or networking permitted without license from IHS-,-,-
29、GEIA-STD-927 2.9 Property View Definition A property is a degree or magnitude of a characteristic or quality of an object. The property view presents structures to represent the qualities of objects. Key Entities Property degree or magnitude of a characteristic or quality of an object Subtypes of pr
30、operty o Condition definition of the precedent that must be fulfilled before a statement or relationship becomes valid o Probability a type of property representing the degree to which something is likely or unlikely o Justification the identification and description of the reasons for something. Ju
31、stification entities may be associated with the data to which they apply o Cost a price property for an object. o Property_value representation of a quantity or magnitude which characterizes a particular quality or attribute applicable to some object Subtypes of property_value Boolean_property_value
32、 specification which captures the truth value of a logical assertion Quantified_property_value specification which captures a quantity which is subject to numerical measure Textual_property_value specification which can not be expressed as a numerical measure or logical truth value and must be captu
33、red in a textual specification Property_value_relationship a relation between two property_value objects Property_definition specification of a measurable or quantifiable quality or aspect of an object. Classification_of_property_value_by_property_definition relation of a property_definition specify
34、ing the characteristic to the property_value representing the characteristic Property_assignment assignment of a property_value to an object Shape distinguishes the form of the extension in space 21 Copyright Government Electronics & Information Technology Association Provided by IHS under license w
35、ith GEIA Not for ResaleNo reproduction or networking permitted without license from IHS-,-,-GEIA-STD-927 Dimension_of_shape a type whose members indicate the use of one shape to describe another shape Unit the abstract quantity used as a basis for a measurement Value_with_unit numerically expressed
36、quantity which may be assigned to some measure. Unit is related to value_with_unit with the unit_component attribute (the measurement unit which is valid for a particular value_with_unit object). The value_with_unit object encompasses the concepts of a value, the unit of the value, and a dimension.
37、Subtypes of value_with_unit o Nominal_value a type of value_with_unit in which the quantity component is expressed as a single numerical quantity o Value_range a type of value_with_unit in which the quantity component is expressed as a range of numerical values o Value_limit a type of value_with_uni
38、t in which the quantity component is expressed as a ceiling or floor constraint on the allowed numerical values 22 Copyright Government Electronics & Information Technology Association Provided by IHS under license with GEIA Not for ResaleNo reproduction or networking permitted without license from IHS-,-,-
