IfcDistributionSystem

IfcDistributionSystem

实体定义

分发系统是设计用于接收、存储、维护、分发或控制分发媒体流的网络。一个常见的例子是加热热水系统，该系统由一个泵、一个水箱和一个相互连接的管道系统组成，用于将热水分配到终端。

集团IFCDDistributionSystem定义了在建筑服务环境中使用的专用系统。

描述配电系统的重要功能源自现有IFC实体：

从IfcSystem继承了通过IfcRelServicesBuildings将分发系统耦合到一个或多个IfcSpatialElement子类型（如有必要）的能力。

它从IfcGroup继承反向属性IsGroupedBy，指向关系实体IfcRelAssignsToGroup。这允许对分发元素（IFCDDistributionElement子类型的实例）进行分组，并在特殊情况下直接对端口（IFCDDistributionPort的实例）进行分组。

它通过指向关系实体ifcreaggregates从IfcObject继承反向属性isdecomposed。它提供了独立（部分）配电系统之间的层次结构。例如，电气主电路可以聚合成分支电路。

IFC4中的新实体。

对于电力系统，IFC4变更，IFCElectricalciit已用于低压（12-1000 V）电源电路，并已被IFC4中的IFCD分配电路所取代；整个电力系统应使用预定义类型为“电气”的IFC配电系统，每个开关电路应使用预定义类型为“电气”的IFC配电电路。

#	Attribute	Type	Cardinality	Description	C
IfcRoot
1	GlobalId	IfcGloballyUniqueId	[1:1]	Assignment of a globally unique identifier within the entire software world.	X
2	OwnerHistory	IfcOwnerHistory	[0:1]	Assignment of the information about the current ownership of that object, including owning actor, application, local identification and information captured about the recent changes of the object, NOTE  only the last modification in stored - either as addition, deletion or modification.	X
3	Name	IfcLabel	[0:1]	Optional name for use by the participating software systems or users. For some subtypes of IfcRoot the insertion of the Name attribute may be required. This would be enforced by a where rule.	X
4	Description	IfcText	[0:1]	Optional description, provided for exchanging informative comments.	X
IfcObjectDefinition
	HasAssignments	IfcRelAssigns @RelatedObjects	S[0:?]	Reference to the relationship objects, that assign (by an association relationship) other subtypes of IfcObject to this object instance. Examples are the association to products, processes, controls, resources or groups.	X
	Nests	IfcRelNests @RelatedObjects	S[0:1]	References to the decomposition relationship being a nesting. It determines that this object definition is a part within an ordered whole/part decomposition relationship. An object occurrence or type can only be part of a single decomposition (to allow hierarchical strutures only).	X
	IsNestedBy	IfcRelNests @RelatingObject	S[0:?]	References to the decomposition relationship being a nesting. It determines that this object definition is the whole within an ordered whole/part decomposition relationship. An object or object type can be nested by several other objects (occurrences or types).	X
	HasContext	IfcRelDeclares @RelatedDefinitions	S[0:1]	References to the context providing context information such as project unit or representation context. It should only be asserted for the uppermost non-spatial object.	X
	IsDecomposedBy	IfcRelAggregates @RelatingObject	S[0:?]	References to the decomposition relationship being an aggregation. It determines that this object definition is whole within an unordered whole/part decomposition relationship. An object definitions can be aggregated by several other objects (occurrences or parts).	X
	Decomposes	IfcRelAggregates @RelatedObjects	S[0:1]	References to the decomposition relationship being an aggregation. It determines that this object definition is a part within an unordered whole/part decomposition relationship. An object definitions can only be part of a single decomposition (to allow hierarchical strutures only).	X
	HasAssociations	IfcRelAssociates @RelatedObjects	S[0:?]	Reference to the relationship objects, that associates external references or other resource definitions to the object.. Examples are the association to library, documentation or classification.	X
IfcObject
5	ObjectType	IfcLabel	[0:1]	The type denotes a particular type that indicates the object further. The use has to be established at the level of instantiable subtypes. In particular it holds the user defined type, if the enumeration of the attribute PredefinedType is set to USERDEFINED.	X
	IsDeclaredBy	IfcRelDefinesByObject @RelatedObjects	S[0:1]	Link to the relationship object pointing to the declaring object that provides the object definitions for this object occurrence. The declaring object has to be part of an object type decomposition. The associated IfcObject, or its subtypes, contains the specific information (as part of a type, or style, definition), that is common to all reflected instances of the declaring IfcObject, or its subtypes.	X
	Declares	IfcRelDefinesByObject @RelatingObject	S[0:?]	Link to the relationship object pointing to the reflected object(s) that receives the object definitions. The reflected object has to be part of an object occurrence decomposition. The associated IfcObject, or its subtypes, provides the specific information (as part of a type, or style, definition), that is common to all reflected instances of the declaring IfcObject, or its subtypes.	X
	IsTypedBy	IfcRelDefinesByType @RelatedObjects	S[0:1]	Set of relationships to the object type that provides the type definitions for this object occurrence. The then associated IfcTypeObject, or its subtypes, contains the specific information (or type, or style), that is common to all instances of IfcObject, or its subtypes, referring to the same type.	X
	IsDefinedBy	IfcRelDefinesByProperties @RelatedObjects	S[0:?]	Set of relationships to property set definitions attached to this object. Those statically or dynamically defined properties contain alphanumeric information content that further defines the object.	X
IfcGroup
	IsGroupedBy	IfcRelAssignsToGroup @RelatingGroup	S[0:?]	Reference to the relationship IfcRelAssignsToGroup that assigns the one to many group members to the IfcGroup object.	X
IfcSystem
	ServicesBuildings	IfcRelServicesBuildings @RelatingSystem	S[0:1]	Reference to the building spatial structure via the objectified relationship IfcRelServicesBuildings, which is serviced by the system.	X
IfcDistributionSystem
6	LongName	IfcLabel	[0:1]	Long name for a distribution system, used for informal purposes. It should be used, if available, in conjunction with the inherited Name attribute. NOTE  In many scenarios the Name attribute refers to the short name or number of a distribution system or branch circuit, and the LongName refers to a descriptive name.	X
7	PredefinedType	IfcDistributionSystemEnum	[0:1]	Predefined types of distribution systems.	X

 

EXPRESS Specification

ENTITY IfcDistributionSystem
 SUPERTYPE OF(IfcDistributionCircuit)
 SUBTYPE OF (IfcSystem);
  LongName : OPTIONAL IfcLabel;
  PredefinedType : OPTIONAL IfcDistributionSystemEnum;
END_ENTITY;

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