Package org.noise_planet.noisemodelling.emission.utils

Class Utils

java.lang.Object

org.noise_planet.noisemodelling.emission.utils.Utils

public class Utils
extends Object

Some basic tools useful for the emission module

Author:

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

Constructor Summary

Constructors

Constructor	Description
Utils()

Method Summary

Modifier and Type	Method	Description
static double	computeSlope(double beginZ, double endZ, double road_length_2d)	Compute the slope between to z points (for a road or rail segment)
static double	dbaToW(double dBA)	Convert dB to W Equivalent to dbToW
static double[]	dbaToW(double[] dBA)	Convert an array of dB values to W
static double	dbToW(double dB)	Convert dB to W
static Double	sumDb5(Double dB1, Double dB2, Double dB3, Double dB4, Double dB5)	Energetic sum of 5 dB values
static double[]	sumDbArray(double[] array1, double[] array2)	Energetic sum of dBA array
static Double	sumDbValues(Double dB1, Double dB2)	Energetic sum of 2 dB values
static double[]	trainLWmperFreq(double[] LWi, double nBUnit, double deltaT)	trainpWperFreq
static Double	Vperhour2NoiseLevel(double LWim, double Qm, double vm)	Compute Noise Level from flow_rate and speed Eq 2.2.1 from Directive 2015
static double[]	Vperhour2NoiseLevelAllFreq(double[] LWimf, double Qm, double vm)	Compute Noise Level from flow_rate and speed Eq 2.2.1 from Directive 2015
static double	wToDb(double w)	Convert W to dB
static double	wToDba(double w)	Convert W to dB Equivalent to wToDb
static double[]	wToDba(double[] w)	Convert an array of W values to dB

Methods inherited from class java.lang.Object

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

Constructor Detail

Utils

public Utils()

Method Detail

dbToW

public static double dbToW(double dB)

Convert dB to W

Parameters:

dB -

Returns:

W (double)

wToDb

public static double wToDb(double w)

Convert W to dB

Parameters:

w -

Returns:

dB (double)

computeSlope

public static double computeSlope(double beginZ,
                                  double endZ,
                                  double road_length_2d)

Compute the slope between to z points (for a road or rail segment)

Parameters:

beginZ - Z start

endZ - Z end

road_length_2d - Road length (projected to Z axis)

Returns:

Slope percentage

Vperhour2NoiseLevel

public static Double Vperhour2NoiseLevel(double LWim,
                                         double Qm,
                                         double vm)
                                  throws IOException

Compute Noise Level from flow_rate and speed Eq 2.2.1 from Directive 2015

Parameters:

LWim - LW,i,m is the directional sound power of a single vehicle and is expressed in dB (re. 10–12 W/m).

Qm - Traffic flow data Qm shall be expressed as yearly average per hour, per time period (day-evening-night), per vehicle class and per source line.

vm - The speed vm is a representative speed per vehicle category: in most cases the lower of the maximum legal speed for the section of road and the maximum legal speed for the vehicle category. If measurement data is unavailable, the maximum legal speed for the vehicle category shall be used.

Returns:

emission sound level in dB/m

Throws:

IOException - if speed < 0 km/h

Vperhour2NoiseLevelAllFreq

public static double[] Vperhour2NoiseLevelAllFreq(double[] LWimf,
                                                  double Qm,
                                                  double vm)
                                           throws IOException

Compute Noise Level from flow_rate and speed Eq 2.2.1 from Directive 2015

Parameters:

LWimf - LW,i,m is the directional sound power of a single vehicle and is expressed in dB (re. 10–12 W/m) and for every freq

Qm - Traffic flow data Qm shall be expressed as yearly average per hour, per time period (day-evening-night), per vehicle class and per source line.

vm - The speed vm is a representative speed per vehicle category: in most cases the lower of the maximum legal speed for the section of road and the maximum legal speed for the vehicle category. If measurement data is unavailable, the maximum legal speed for the vehicle category shall be used.

Returns:

emission sound level in dB/m

Throws:

IOException - if speed < 0 km/h

sumDbArray

public static double[] sumDbArray(double[] array1,
                                  double[] array2)

Energetic sum of dBA array

Parameters:

array1 -

array2 -

Returns:

energetic sum of dBA array

dbaToW

public static double dbaToW(double dBA)

Convert dB to W Equivalent to dbToW

Parameters:

dBA -

Returns:

dbaToW

public static double[] dbaToW(double[] dBA)

Convert an array of dB values to W

Parameters:

dBA - array of dB values

Returns:

array of W values

wToDba

public static double wToDba(double w)

Convert W to dB Equivalent to wToDb

Parameters:

w -

Returns:

wToDba

public static double[] wToDba(double[] w)

Convert an array of W values to dB

Parameters:

w - array of w values

Returns:

array of dB values

sumDbValues

public static Double sumDbValues(Double dB1,
                                 Double dB2)

Energetic sum of 2 dB values

Parameters:

dB1 - First value in dB

dB2 - Second value in dB

Returns:

sumDb5

public static Double sumDb5(Double dB1,
                            Double dB2,
                            Double dB3,
                            Double dB4,
                            Double dB5)

Energetic sum of 5 dB values

Parameters:

dB1 - value in dB

dB2 - value in dB

dB3 - value in dB

dB4 - value in dB

dB5 - value in dB

Returns:

trainLWmperFreq

public static double[] trainLWmperFreq(double[] LWi,
                                       double nBUnit,
                                       double deltaT)
                                throws IOException

trainpWperFreq

Throws:

IOException