8.11.3.6 IfcDimensionalExponents
RV ⓘ
AbV ⓘ
8.11.3.6.1 Semantic definition
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)). Length, mass, time, electric current, thermodynamic temperature, amount of substance, and luminous intensity are the seven base quantities. A length of 2 millimetres has a length exponent of 1. The remaining exponents are equal to 0. 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. Corresponding STEP name: dimensional_exponents, please refer to ISO/IS 10303-41 for the final definition of the formal standard. New entity in IFC1.5.1.8.11.3.6.2 Entity inheritance
8.11.3.6.3 Attributes
| # | Attribute | Type | Description |
|---|---|---|---|
| IfcDimensionalExponents (7) | |||
| 1 | LengthExponent | INTEGER |
The power of the length base quantity. |
| 2 | MassExponent | INTEGER |
The power of the mass base quantity. |
| 3 | TimeExponent | INTEGER |
The power of the time base quantity. |
| 4 | ElectricCurrentExponent | INTEGER |
The power of the electric current base quantity. |
| 5 | ThermodynamicTemperatureExponent | INTEGER |
The power of the thermodynamic temperature base quantity. |
| 6 | AmountOfSubstanceExponent | INTEGER |
The power of the amount of substance base quantity. |
| 7 | LuminousIntensityExponent | INTEGER |
The power of the luminous intensity base quantity. |
8.11.3.6.4 Examples
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Figure 8.11.3.6.A -
Figure 8.11.3.6.B -
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Figure 8.11.3.6.F -
Figure 8.11.3.6.G -
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Figure 8.11.3.6.P -
Figure 8.11.3.6.Q
8.11.3.6.5 Formal representation
ENTITY IfcDimensionalExponents;
LengthExponent : INTEGER;
MassExponent : INTEGER;
TimeExponent : INTEGER;
ElectricCurrentExponent : INTEGER;
ThermodynamicTemperatureExponent : INTEGER;
AmountOfSubstanceExponent : INTEGER;
LuminousIntensityExponent : INTEGER;
END_ENTITY;