Traffic noise formula (Traffic Noise Overlay): Difference between revisions

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(Undo revision 48422 by Frank@tygron.nl (talk))
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<math>D_l = 0.01 \cdot d^{0.9}</math>
<math>D_l = 0.01 \cdot d^{0.9}</math>


<math>D_m = max( 0.0, 3.5 \cdot (1.0 - e^{ \frac{-0.04 \cdot d}{h_s + 0.75 + h_c + 0.75}} )</math>
<math>D_m = max( 0.0, 3.5 \cdot (1.0 - e^{ \frac{-0.04 \cdot d}{h_s + 0.75 + h_c + 0.75}}))</math>




where:
where:
: <math>LAeq</math> = equivalent noise level (dB(A))
: <math>LAeq</math> = equivalent noise level (dB(A))
: <math>E</math> =  emission
: <math>E</math> =  [[Traffic noise formula (Traffic Noise Overlay)#Emission|calculated emission]]
: <math>C_o</math> = [[Traffic noise formula (Traffic Noise Overlay)#acceleration term on intersections]] (default = 0 dB(A))
: <math>C_o</math> = [[Traffic noise formula (Traffic Noise Overlay)#acceleration term on intersections|acceleration term on intersections]] (default = 0 dB(A))
: <math>C_r</math> = reflection term. This term is not used, and by default 0 dB.
: <math>C_r</math> = reflection term. This term is not used, and by default 0 dB.
: <math>D_a</math> = [[Traffic noise formula (Traffic Noise Overlay)#Distance reduction|distance reduction]]
: <math>D_a</math> = [[Traffic noise formula (Traffic Noise Overlay)#Distance reduction|distance reduction]]
: <math>D_l</math> = air reduction (default = XXX dB(A))
: <math>D_l</math> = air reduction (default = XXX dB(A))
: <math>D_b</math> = surface reduction. This term is not used, and by default 0 dB.
: <math>D_b</math> = surface reduction. This term is not used, and by default 0 dB.
: <math>D_m</math> = meteorological reduction (default = XXX dB(A))
: <math>D_m</math> = calculated meteorological reduction
: <math>d</math> = distance from the receiver to the source.
: <math>d</math> = distance from the receiver to the source.
: <math>e</math> = Euler's number, approximated as 2.7182.
: <math>e</math> = Euler's number, approximated as 2.7182.
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Default values are taken from InfoMil [https://www.infomil.nl/onderwerpen/geluid/regelgeving/wet-geluidhinder/wegverkeerslawaai/akoestisch-rapport/cwegdek/]
Default values are taken from InfoMil [https://www.infomil.nl/onderwerpen/geluid/regelgeving/wet-geluidhinder/wegverkeerslawaai/akoestisch-rapport/cwegdek/]


===Acceleration term on intersections===
Accelerating on intersections can cause more noise. This value is only calculated for roads of category INTERSECTION. It is calculated as followed:
<math>C_o = 1.4 + \frac{Q_v + Q_t + Q_b}{ Q_c + Q_v  + Q_t + Q_b}</math>
===Distance reduction===
Distance reduction is computed as:
<math>D_a = 10 \cdot log(r)</math>
where:
: <math>D_a</math> = distance reduction
: <math>r</math> = shortest distance between the source and point of evaluation
[[File:Geluidsoverlast.png|600px]]
===Emission===
===Emission===
Emission is computed as:
Emission is computed as:
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where:
where:
:<math>E_{c,start}</math> Emission start value. Configurable with model attribute [[Emission start (Traffic Noise Overlay)]]. See also: InfoMil [https://www.infomil.nl/onderwerpen/geluid/regelgeving/wet-geluidhinder/wegverkeerslawaai/akoestisch-rapport/cwegdek/]
:<math>E_{c,start}</math> Emission start value. Configurable with model attribute [[Emission start (Traffic Noise Overlay)]]. See also: InfoMil [https://www.infomil.nl/onderwerpen/geluid/regelgeving/wet-geluidhinder/wegverkeerslawaai/akoestisch-rapport/cwegdek/]
:<math>E_{c_mult}</math> Emission factor. Configurable with model attribute [[Emission mult (Traffic Noise Overlay)]]. See also: InfoMil [https://www.infomil.nl/onderwerpen/geluid/regelgeving/wet-geluidhinder/wegverkeerslawaai/akoestisch-rapport/cwegdek/]
:<math>E_{c,mult}</math> Emission factor. Configurable with model attribute [[Emission mult (Traffic Noise Overlay)]]. See also: InfoMil [https://www.infomil.nl/onderwerpen/geluid/regelgeving/wet-geluidhinder/wegverkeerslawaai/akoestisch-rapport/cwegdek/]
:<math>V_c</math> = The traffic type's speed, configured in roads with Function Value [[Traffic speed (Traffic Noise Overlay)|TRAFFIC_SPEED]].
:<math>V_c</math> = The traffic type's speed, configured in roads with Function Value [[Traffic speed (Traffic Noise Overlay)|TRAFFIC_SPEED]].
:<math>V0_c</math> = The traffic type's reference speed, configured per traffic type using the model attribute [[V0 (Traffic Noise Overlay)|V0]].  
:<math>V0_c</math> = The traffic type's reference speed, configured per traffic type using the model attribute [[V0 (Traffic Noise Overlay)|V0]].  
:<math>\sigma</math> = road surface correction value at reference traffic speed. Configurable in roads with Function Value [[Traffic noise sigma (Traffic Noise Overlay)|TRAFFIC_NOISE_SIGMA]]
:<math>\sigma</math> = road surface correction value at reference traffic speed. Configurable in roads with Function Value [[Traffic noise sigma (Traffic Noise Overlay)|TRAFFIC_NOISE_SIGMA]]
:<math>\tau</math> = road surface correction factor per 10 km/hour deviation from reference traffic speed. Configurable in roads with Function Value [[Traffic noise tau (Traffic Noise Overlay)|TRAFFIC_NOISE_TAU]]
:<math>\tau</math> = road surface correction factor per 10 km/hour deviation from reference traffic speed. Configurable in roads with Function Value [[Traffic noise tau (Traffic Noise Overlay)|TRAFFIC_NOISE_TAU]]
===Acceleration term on intersections===
Accelerating on intersections can cause more noise. This value is only calculated for roads of category INTERSECTION. It is calculated as followed:
<math>C_o = 1.4 + \frac{Q_v + Q_t + Q_b}{ Q_c + Q_v  + Q_t + Q_b}</math>
===Distance reduction===
Distance reduction is computed as:
<math>D_a = 10 \cdot log(r)</math>
where:
: <math>D_a = distance reduction
: <math>r</math> = shortest distance between the source and point of evaluation
[[File:Geluidsoverlast.png|600px]]





Latest revision as of 14:49, 27 October 2022

The calculations for the Traffic Noise Overlay follow the standard rekenmethode 1 (SRM 1), as described on http://wetten.overheid.nl/BWBR0031722/2015-07-01#BijlageIII:


where:

= equivalent noise level (dB(A))
= calculated emission
= acceleration term on intersections (default = 0 dB(A))
= reflection term. This term is not used, and by default 0 dB.
= distance reduction
= air reduction (default = XXX dB(A))
= surface reduction. This term is not used, and by default 0 dB.
= calculated meteorological reduction
= distance from the receiver to the source.
= Euler's number, approximated as 2.7182.
= Building datum height (DTM) of the noise source
= Building datum height (DTM) of the noise receiving cell.

Default values are taken from InfoMil [1]

Acceleration term on intersections

Accelerating on intersections can cause more noise. This value is only calculated for roads of category INTERSECTION. It is calculated as followed:

Distance reduction

Distance reduction is computed as:

where:

= distance reduction
= shortest distance between the source and point of evaluation

Geluidsoverlast.png

Emission

Emission is computed as:

where:

= the combined noise emission
= the calculated noise emission for cars
= the calculated noise emission for vans
= the calculated noise emission for trucks
= the calculated noise emission for buses

The emission per type of traffic is computed similarly, with values specific to the type of traffic. It is calculated as followed for car traffic:

where:

Emission start value. Configurable with model attribute Emission start (Traffic Noise Overlay). See also: InfoMil [2]
Emission factor. Configurable with model attribute Emission mult (Traffic Noise Overlay). See also: InfoMil [3]
= The traffic type's speed, configured in roads with Function Value TRAFFIC_SPEED.
= The traffic type's reference speed, configured per traffic type using the model attribute V0.
= road surface correction value at reference traffic speed. Configurable in roads with Function Value TRAFFIC_NOISE_SIGMA
= road surface correction factor per 10 km/hour deviation from reference traffic speed. Configurable in roads with Function Value TRAFFIC_NOISE_TAU


Notes

  • If the traffic amount is defined as a single value, that value is used for all defined hours. However, if the amount if an array of values, each of the 24 indexes of that array are assumed to correspond to the hour denoted by those indexes, and as such that specific value from the array is used.

See also

References