Package org.noise_planet.noisemodelling.propagation.cnossos

Class AttenuationCnossos

java.lang.Object

org.noise_planet.noisemodelling.propagation.cnossos.AttenuationCnossos

public class AttenuationCnossos
extends Object

Return the dB value corresponding to the parameters Following Directive 2015/996/EN https://circabc.europa.eu/sd/a/9566c5b9-8607-4118-8427-906dab7632e2/Directive_2015_996_EN.pdf

Author:

Pierre Aumond

Constructor Summary

Constructors

Constructor	Description
AttenuationCnossos()

Method Summary

Modifier and Type	Method	Description
static double[]	aAtm(double[] alphaAtmosphericKm, double distance)	Compute AAtm
static double[]	aBoundary(CnossosPath path, AttenuationParameters data)	Compute ABoundary
static double[]	aDiv(CnossosPath pathParameters, AttenuationParameters data)	Compute ADiv the attenuation
static double	aGroundF(CnossosPath proPathParameters, SegmentPath path, AttenuationParameters data, int idFreq)
static double	aGroundF(CnossosPath proPathParameters, SegmentPath path, AttenuationParameters data, int idFreq, boolean forceGPath)	Compute AGroundF
static double	aGroundH(CnossosPath proPathParameters, SegmentPath path, AttenuationParameters data, int idFreq)	Compute AGroundH
static double	aGroundH(CnossosPath proPathParameters, SegmentPath path, AttenuationParameters data, int idFreq, boolean forceGPath)	Compute AGroundH
static double[]	computeCnossosAttenuation(AttenuationParameters data, CnossosPath proPathParameters, SceneWithAttenuation scene, boolean exportAttenuationMatrix)	Compute the Attenuation for each frequency with a given sourceId, sourceLi and sourceId
static double[]	deltaRetrodif(CnossosPath reflect, AttenuationParameters data)	Compute deltaRetrodif Figure 2.5.36
static double	getADiv(double distance)	Compute attenuation of sound energy by distance.
static double[]	getAGroundCore(CnossosPath pathParameters, SegmentPath segmentPath, AttenuationParameters data)	Eq. 2.5.15: Compute Aground

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

AttenuationCnossos

public AttenuationCnossos()

Method Details

getADiv

public static double getADiv(double distance)

Compute attenuation of sound energy by distance. Minimum distance is one meter. Eq. 2.5.12

Parameters:

distance - Distance in meter

Returns:

Attenuated sound level. Take only account of geometric dispersion of sound wave.

getAGroundCore

public static double[] getAGroundCore(CnossosPath pathParameters,
 SegmentPath segmentPath,
 AttenuationParameters data)

Eq. 2.5.15: Compute Aground

Parameters:

pathParameters -

segmentPath -

data -

Returns:

list double with the values of AGround

aDiv

public static double[] aDiv(CnossosPath pathParameters,
 AttenuationParameters data)

Compute ADiv the attenuation

Parameters:

pathParameters -

data -

Returns:

list double with the values of ADiv

aAtm

public static double[] aAtm(double[] alphaAtmosphericKm,
 double distance)

Compute AAtm

Parameters:

alphaAtmosphericKm - Absorption per km

distance - Distance (m)

Returns:

list double with the values of AAtm

aBoundary

public static double[] aBoundary(CnossosPath path,
 AttenuationParameters data)

Compute ABoundary

Parameters:

path -

data -

Returns:

deltaRetrodif

public static double[] deltaRetrodif(CnossosPath reflect,
 AttenuationParameters data)

Compute deltaRetrodif Figure 2.5.36

Parameters:

reflect -

data -

Returns:

list double with the values of deltaRetrodif

aGroundH

public static double aGroundH(CnossosPath proPathParameters,
 SegmentPath path,
 AttenuationParameters data,
 int idFreq)

Compute AGroundH

Parameters:

proPathParameters -

path -

data -

idFreq -

Returns:

homogeneous ground Atktenuation in db

aGroundH

public static double aGroundH(CnossosPath proPathParameters,
 SegmentPath path,
 AttenuationParameters data,
 int idFreq,
 boolean forceGPath)

Compute AGroundH

Parameters:

proPathParameters -

path -

data -

idFreq -

forceGPath -

Returns:

homogeneous ground Attenuation in db

aGroundF

public static double aGroundF(CnossosPath proPathParameters,
 SegmentPath path,
 AttenuationParameters data,
 int idFreq)

aGroundF

public static double aGroundF(CnossosPath proPathParameters,
 SegmentPath path,
 AttenuationParameters data,
 int idFreq,
 boolean forceGPath)

Compute AGroundF

Parameters:

proPathParameters -

path -

data -

idFreq -

forceGPath -

Returns:

favourable ground Attenuation in db

computeCnossosAttenuation

public static double[] computeCnossosAttenuation(AttenuationParameters data,
 CnossosPath proPathParameters,
 SceneWithAttenuation scene,
 boolean exportAttenuationMatrix)

Compute the Attenuation for each frequency with a given sourceId, sourceLi and sourceId

Parameters:

data - Attenuation parameters

proPathParameters - Cnossos paths

scene - Scene with attenuation data

exportAttenuationMatrix - if true, store intermediate values in proPathParameters for debugging purpose

Returns:

double list of attenuation