Package org.noise_planet.noisemodelling.emission.road.cnossos

Class RoadCnossos

java.lang.Object

org.noise_planet.noisemodelling.emission.road.cnossos.RoadCnossos

public class RoadCnossos
extends Object

Compute the emission sound level of a road segment in dB/m Reference document is "Commission Directive (EU) 2015/996 of 19 May 2015 establishing common noise assessment methods according to Directive 2002/49/EC of the European Parliament and of the Council (Text with EEA relevance)" 2015 including its 2020 amendments https://eur-lex.europa.eu/legal-content/EN/TXT/?uri=OJ:JOL_2015_168_R_0001 for 2015 version https://eur-lex.europa.eu/legal-content/GA/TXT/?uri=CELEX:32020L0367 for amendments

Author:

Nicolas Fortin, Université Gustave Eiffel, Pierre Aumond, Université Gustave Eiffel

Constructor Summary

Constructors

Constructor	Description
RoadCnossos()

Method Summary

Modifier and Type	Method	Description
static double	evaluate(RoadCnossosParameters roadCnossosParameters)	Return the noise emission level of a road segment in dB/m
static Double	getA_RoadSurfaceCoeff(int Freq, String vehCat, String roadSurface, int fileVersion)	Get "a" road surface coefficient (also called spectrum) for a frequency value
static Double	getB_RoadSurfaceCoeff(String vehCat, String roadSurface, int fileVersion)	Get "b" road surface coefficient (also called ßm) for a frequency value
static com.fasterxml.jackson.databind.JsonNode	getCnossosData(int fileVersion)	Get the CNOSSOS coefficients from a specific file version.
static Double	getCoeff(String coeff, int freq, String vehicleCategory, int coeffVer)	get vehicle emission values coefficients
static double	getCp(String vehCat, int k, int fileVersion)	Get "Cp" coefficient related to the increase in propulsion noise near an intersection (due to deceleration and acceleration phases).
static double	getCr(String vehCat, int k, int fileVersion)	Get "Cr" coefficient related to the decrease in rolling noise near an intersection (due to deceleration and acceleration phases).
static Double	getNoiseLvl(double base, double adj, double speed, double speedBase)	Get rolling or motor sound level in dB at a specific speed

Methods inherited from class java.lang.Object

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

Constructor Detail

RoadCnossos

public RoadCnossos()

Method Detail

getCnossosData

public static com.fasterxml.jackson.databind.JsonNode getCnossosData(int fileVersion)

Get the CNOSSOS coefficients from a specific file version.

Parameters:

fileVersion - 1=RailwayCnossosEU_2020.json; other = RailwayCnossosSNCF_2021.json

Returns:

getA_RoadSurfaceCoeff

public static Double getA_RoadSurfaceCoeff(int Freq,
                                           String vehCat,
                                           String roadSurface,
                                           int fileVersion)
                                    throws IOException

Get "a" road surface coefficient (also called spectrum) for a frequency value

Parameters:

Freq - Frequency in Hz (octave band)

vehCat - Vehicle category (1,2,3,4a,4b,5)

roadSurface - Road surface identifier - The list is given in the following file : src/main/resources/org/noise_planet/noisemodelling/emission/RoadCnossos_2020.json search for NL01 or FR_R2 for example

fileVersion - 2015 or 2019 coefficients version

Returns:

a Road Coeff

Throws:

IOException

getB_RoadSurfaceCoeff

public static Double getB_RoadSurfaceCoeff(String vehCat,
                                           String roadSurface,
                                           int fileVersion)

Get "b" road surface coefficient (also called ßm) for a frequency value

Parameters:

vehCat - Vehicle category (1,2,3,4a,4b,5)

roadSurface - Road surface identifier - The list is given in the following file : src/main/resources/org/noise_planet/noisemodelling/emission/RoadCnossos_2020.json search for NL01 or FR_R2 for example

fileVersion - 2015 or 2019 coefficients version

Returns:

a Road Coeff

getCr

public static double getCr(String vehCat,
                           int k,
                           int fileVersion)

Get "Cr" coefficient related to the decrease in rolling noise near an intersection (due to deceleration and acceleration phases).

Parameters:

vehCat - Vehicle category (1,2,3,4a,4b,5)

k - k=1 Crossing lights, k=2 roundabout

fileVersion - 2015 or 2019 coefficients version

Returns:

Cr coefficient

getCp

public static double getCp(String vehCat,
                           int k,
                           int fileVersion)

Get "Cp" coefficient related to the increase in propulsion noise near an intersection (due to deceleration and acceleration phases).

Parameters:

vehCat - Vehicle category

k - k=1 Crossing lights, k=2 roundabout

fileVersion - 2015 or 2019 coefficients version

Returns:

Cp coefficient

getCoeff

public static Double getCoeff(String coeff,
                              int freq,
                              String vehicleCategory,
                              int coeffVer)

get vehicle emission values coefficients

Parameters:

coeff - ar,br,ap,bp,a,b (ar, br, rolling noise / ap,bp, propulsion noise / a,b, studded tyres)

freq - Frequency in Hz (octave band)

vehicleCategory - 1,2,3,4a,4b..

Returns:

Vehicle emission values coefficients

getNoiseLvl

public static Double getNoiseLvl(double base,
                                 double adj,
                                 double speed,
                                 double speedBase)

Get rolling or motor sound level in dB at a specific speed

Parameters:

base - coeff A

adj - coeff B

speed - vm in km/h

speedBase - vref in km/h

Returns:

evaluate

public static double evaluate(RoadCnossosParameters roadCnossosParameters)
                       throws IOException

Return the noise emission level of a road segment in dB/m

Parameters:

roadCnossosParameters - every parameters linked to RoadCnossosParameters class (e.g. speed on the road segment)

Returns:

Noise level in dB

Throws:

IOException