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 Details

    • Utils

      public Utils()

  • Method Details

    • 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