IFC 4.3.x development

8.11.3.6 IfcDimensionalExponents

8.11.3.6.1 Semantic definitions at the entity

NOTE  Definition according to ISO/CD 10303-41:1992
The dimensionality of any quantity can be expressed as a product of powers of the dimensions of base quantities. The dimensional exponents entity defines the powers of the dimensions of the base quantities. All the physical quantities are founded on seven base quantities (ISO 31 (clause 2)).

NOTE  Length, mass, time, electric current, thermodynamic temperature, amount of substance, and luminous intensity are the seven base quantities.

EXAMPLE  A length of 2 millimetres has a length exponent of 1. The remaining exponents are equal to 0.

EXAMPLE  A velocity of 2 millimetres per second has a length exponent of 1 and a time exponent of -1. The remaining exponents are equal to 0.

NOTE  Corresponding STEP name: dimensional_exponents, please refer to ISO/IS 10303-41 for the final definition of the formal standard.

HISTORY  New entity in IFC1.5.1.

8.11.3.6.1 Attributes

#Attribute Type Description
IfcDimensionalExponents
1LengthExponent INTEGERThe power of the length base quantity.
2MassExponent INTEGERThe power of the mass base quantity.
3TimeExponent INTEGERThe power of the time base quantity.
4ElectricCurrentExponent INTEGERThe power of the electric current base quantity.
5ThermodynamicTemperatureExponentINTEGERThe power of the thermodynamic temperature base quantity.
6AmountOfSubstanceExponent INTEGERThe power of the amount of substance base quantity.
7LuminousIntensityExponent INTEGERThe power of the luminous intensity base quantity.

8.11.3.6.2 Entity inheritance

dot_inheritance IfcDimensionalExponents IfcDimensionalExponents

8.11.3.6.3 Formal representations

ENTITY IfcDimensionalExponents;
	LengthExponent : INTEGER;
	MassExponent : INTEGER;
	TimeExponent : INTEGER;
	ElectricCurrentExponent : INTEGER;
	ThermodynamicTemperatureExponent : INTEGER;
	AmountOfSubstanceExponent : INTEGER;
	LuminousIntensityExponent : INTEGER;
END_ENTITY;