AtmosphericAbsorption: ISO 9613-1 pure-tone absorption coefficient
(dB/m). PointSourceLevel: \(L_p = L_W + D_c - (20\log_{10} d +
11) - \alpha d - A_{extra}\). AttenuationDistance: distance at which
that level reaches a threshold. GroundAttenuation: ISO 9613-2
alternative ground attenuation and \(D_\Omega\).
BarrierAttenuation: ISO 9613-2 screening \(D_z\) (single or double
diffraction). FoliageAttenuation: ISO 9613-2 Table A.1.
NoiseMap: energetic sum over point sources. NoiseZones:
reporting bands and exposed counts.
Usage
AtmosphericAbsorption(
f,
temperature_c = 20,
humidity = 70,
pressure_kpa = 101.325
)
PointSourceLevel(lw, d, alpha = 0, dc = 0, extra = 0)
AttenuationDistance(lw, threshold, alpha = 0, dc = 0)
GroundAttenuation(dp, hs, hr)
BarrierAttenuation(d_ss, d_sr, d, f, a = 0, e = 0, c = 340)
FoliageAttenuation(df, band)
NoiseMap(lw, sources, receivers, alpha = 0, dc = 0, min_distance = 1)
NoiseZones(levels, breaks = c(55, 60, 65, 70, 75), population = NULL)Arguments
- f
Frequencies (Hz).
- temperature_c, humidity, pressure_kpa
Atmospheric state.
- lw
Sound power level(s).
- d
Distance(s) (m).
- alpha
Absorption (dB/m).
- dc
Directivity correction (dB).
- extra
Further attenuation (dB).
- threshold
Target level.
- dp, hs, hr
Horizontal distance, source and receiver heights.
- d_ss, d_sr
Source-to-edge and edge-to-receiver distances.
- a
Lateral offset parallel to the barrier edge.
- e
Distance between the two edges (double diffraction).
- c
Speed of sound.
- df
Path length through foliage.
- band
Octave midband frequency (63 to 8000).
- sources, receivers
Two-column coordinate matrices.
- min_distance
Minimum distance.
- levels
Levels to classify into bands.
- breaks
Band limits.
- population
Optional counts.
References
ISO 9613-1:1993 and ISO 9613-2:1996, Acoustics – Attenuation of sound during propagation outdoors, Parts 1 and 2.
Examples
1000 * AtmosphericAbsorption(1000)
#> [1] 4.977811
PointSourceLevel(100, c(10, 100))
#> [1] 69 49
BarrierAttenuation(10, 10, 19, 1000)$Dz
#> [1] 17.84788