Difference between revisions of "Conversion formulas for environmental noise metrics"

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(Added category: 'Noise')
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{{variable|moderator=Erkki Kuusisto|stub=Yes}}
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{{variable|moderator=Erkki Kuusisto}}
  
 
== Scope ==
 
== Scope ==
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What are the appropriate formulas for converting various environmental noise metrics (e.g. L<sub>DEN</sub>, L<sub>night</sub>, L<sub>Aeq,22-07</sub>, L<sub>Aeq,07-22</sub>, L<sub>Aeq,24h</sub>) into each other?
 
What are the appropriate formulas for converting various environmental noise metrics (e.g. L<sub>DEN</sub>, L<sub>night</sub>, L<sub>Aeq,22-07</sub>, L<sub>Aeq,07-22</sub>, L<sub>Aeq,24h</sub>) into each other?
  
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The formulas should take into account
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The formulas should take into account...
 
:a) the use of different time bases (e.g. 24 h for L<sub>Aeq,24h</sub>, 8 h for L<sub>night</sub>)
 
:a) the use of different time bases (e.g. 24 h for L<sub>Aeq,24h</sub>, 8 h for L<sub>night</sub>)
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:b) the use of weights for different times of day
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:b) the use of penalties/bonuses for different times of day (e.g. 5 and 10 dB for evening and night in L<sub>DEN</sub>, respectively)
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:c) different calculation heights (e.g. 4 m for Lden)
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:c) different calculation heights (e.g. 4 m for L<sub>DEN</sub>, 2 m for L<sub>Aeq,07-22</sub>)
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:d) the typical activity profile of the noise source in question (e.g. relative traffic densities of day, evening, and night).
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:d) the typical activity profile of the noise source in question (e.g. relative traffic intensities of day, evening, and night).
  
 
== Definition ==
 
== Definition ==
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=== Data ===
 
=== Data ===
  
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Description of the data used for obtaining the value of the variable
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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 (<font color=red>references to be added</font>)
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(e.g. measurement data; mathematical method and its parameters). <br>
 
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Please include references (preferably using the ''<nowiki><ref> </ref></nowiki>'' tags)
 
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and links to original data, as appropriate.
 
  
 
=== Dependencies ===
 
=== Dependencies ===
  
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List of upstream variables.
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The input data requested by the [[Media:Noise descriptor converter v1 for Opasnet.xls | Converter]] are:
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The variables can be listed used descriptive (free-format) names or unambiguous identifiers
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(e.g. [[Analytica]] IDs).
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* beginning and ending periods of day, evening, night
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* relative traffic intensities of each of the above periods
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* calculation height correction
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Note: Default values have been entered into the [[Media:Noise descriptor converter v1 for Opasnet.xls | Converter]].
  
 
=== Unit ===
 
=== Unit ===
  
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Unit in which the result is expressed.
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Not applicable.
  
 
=== Formula ===
 
=== Formula ===
  
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Algebra or other explicit methods if possible
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(The conversions include usual dB arithmetics only. Please see the [[Media:Noise descriptor converter v1 for Opasnet.xls | Converter]] for details.)
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(e.g. [[Analytica]] code between the ''<nowiki><anacode> </anacode></nowiki>'' tags).
 
  
 
== Result ==
 
== Result ==
  
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If possible, a numerical expression or distribution.
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The conversion formulas are automatically calculated using the [[Media:Noise descriptor converter v1 for Opasnet.xls | Noise descriptor converter]] (Excel tool).
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* NB! For proper display, use "dot" as the decimal separator in Excel.
  
 
==See also==
 
==See also==
  
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Links to relevant information that does not belong to ''Definition''.
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==Keywords==
  
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==Keywords==
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* noise descriptor
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* noise indicator
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* noise metric
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* conversion factor
  
 
==References==
 
==References==
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...will appear here automatically, if cited above using the ''<nowiki><ref> </ref></nowiki>'' tags.
 
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Additional references can also be listed here.
 
  
 
<references/>
 
<references/>

Latest revision as of 22:39, 8 April 2011


Scope

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

The formulas should take into account...

a) the use of different time bases (e.g. 24 h for LAeq,24h, 8 h for Lnight)
b) the use of penalties/bonuses for different times of day (e.g. 5 and 10 dB for evening and night in LDEN, respectively)
c) different calculation heights (e.g. 4 m for LDEN, 2 m for LAeq,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.

See also

Keywords

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

References


Related files

<mfanonymousfilelist></mfanonymousfilelist>

Conversion formulas for environmental noise metrics. Opasnet . [1]. Accessed 19 May 2024.
Retrieved from "http://www.opasnet.org/testiwiki/index.php?title=Conversion_formulas_for_environmental_noise_metrics&oldid=20201"