Conversion formulas for environmental noise metrics

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Scope

What are the appropriate formulas for converting various environmental noise metrics (e.g. L_DEN, L_night, L_Aeq,22-07, L_Aeq,07-22, L_Aeq,24h) into each other?

The formulas should take into account...

a) the use of different time bases (e.g. 24 h for L_Aeq,24h, 8 h for L_night)

b) the use of penalties/bonuses for different times of day (e.g. 5 and 10 dB for evening and night in L_DEN, respectively)

c) different calculation heights (e.g. 4 m for L_DEN, 2 m for L_Aeq,07-22)

d) the typical activity profile of the noise source in question (e.g. relative traffic intensities of day, evening, and night).

Definition

Data

A default value for the calculation height effect (i.e. 1.5 dB for the 4m vs 2m difference) has been obtained from several sources (references to be added)

Dependencies

The input data requested by the Converter are:

• beginning and ending periods of day, evening, night
• relative traffic intensities of each of the above periods
• calculation height correction

Note: Default values have been entered into the Converter.

Unit

Not applicable.

Formula

(The conversions include usual dB arithmetics only. Please see the Converter for details.)

Result

The conversion formulas are automatically calculated using the  Noise descriptor converter (Excel tool).

• NB! For proper display, use "dot" as the decimal separator in Excel.

Keywords

• noise descriptor
• noise indicator
• noise metric
• conversion factor

Related files

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Conversion formulas for environmental noise metrics. Opasnet . [1]. Accessed 20 Dec 2024.