6.2.4.22 Pset_SoundAttenuation
6.2.4.22.1 Semantic definition
Common definition to capture sound pressure at a point on behalf of a device typically used within the context of building services and flow distribution systems. To indicate sound values from an instance of IfcDistributionFlowElement at a particular location, IfcAnnotation instance(s) should be assigned to the IfcDistributionFlowElement through the IfcRelAssignsToProduct relationship. The IfcAnnotation should specify ObjectType of 'Sound' and geometric representation of 'Annotation Point' consisting of a single IfcPoint subtype as described at IfcAnnotation. This property set is instantiated multiple times on an object for each frequency band. HISTORY: New property set in IFC Release 2x4.
6.2.4.22.2 Applicable entities
6.2.4.22.3 Properties
| Name | Property Type | Data Type | Description | |
|---|---|---|---|---|
| SoundScale | IfcPropertyEnumeratedValue | PEnum_SoundScale |
The reference sound scale. DBA: Decibels in an A-weighted scale DBB: Decibels in an B-weighted scale DBC: Decibels in an C-weighted scale NC: Noise criteria NR: Noise rating |
|
| SoundFrequency | IfcPropertyListValue | IfcFrequencyMeasure |
List of nominal sound frequencies, correlated to the SoundPressure time series values (IfcTimeSeries.ListValues) |
|
| SoundPressure | IfcPropertyReferenceValue | IfcTimeSeries |
A time series of sound pressure values measured in decibels at a reference pressure of 20 microPascals for the referenced octave band frequency. Each value in IfcTimeSeries.ListValues is correlated to the sound frequency at the same position within SoundFrequencies. |