Industry
VDI 2714/2720
Calculation:
| Emission | Lw = Lw_in + Dt + 10 lg (length or area) [dB(A)] with correction for operating time Dt = 10 lg (T/Tref) dB |
| Immission | Lr = Lw + K0 - Di - Ds - Dl - Dbm - Dd - Dg - De - Dlang - RL [dB(A)] |
Parameters:
| Lw | sound power level PWL / PWL‘ / PWL“ [dB(A)] |
|---|---|
| K0 | correction for solid angle (dB) |
| Di | directivity index of the sound source (dB) |
| Ds | attenuation due to divergence (dB) |
| Dl | atmospheric absorption index (dB) |
| Dbm | attenuation due to meteorological and ground (dB) |
| Dd | attenuation due to foliage (dB) |
| Dg | attenuation by buildings (dB) |
| De | attenuation due to screening (dB) |
| Dlang | correction for long-term average level (dB) |
ISO 9613 (1996) and ISO 9613 (2024)
Calculation:
| Emission | Lw = Lw_in + Dt + 10 lg (length or area) [dB(A)] with correction for operating time Dt = 10 lg (T/Tref) dB |
| Immission | Lr = Lw + K0 - Di - Adiv - Aatm - Agr - Afol - Ahous - Abar - Cmet - RL [dB(A)] |
Parameters:
| Lw | sound power level PWL / PWL‘ / PWL“ [dB(A)] |
| l/a | length L (m) or area A (m²), for point sources = 1 |
| K0 | directivity index (dB), equals to Domega in ISO 9613-2 - spectral ground attenuation: K0 entered on source dialog only - non-spectral ground att.: entered K0 + Domega acc. equation (11) ISO (1996) |
| Di | directivity correction (dB) |
| Adiv | attenuation due to divergence (dB) |
| Aatm | atmospheric absorption index (dB) |
| Agr | attenuation due to ground absorption (dB) |
| Afol | attenuation due to foliage (dB) |
| Ahous | attenuation by buildings (dB) |
| Abar | attenuation due to screening (dB) |
| Cmet | meteorological correction for long-term average level (dB) |
ÖAL 28
Calculation:
| Emission | Lw = Lw_in + Dt + 10 lg (length or area) [dB(A)] with correction for operating time Dt = 10 lg (T/Tref) dB |
| Immission | Lr = Lw + DLphi + DLd + DLa + DLs + DLv + DLb + DLst - RL [dB(A)] |
Parameters:
| Lw | sound power level PWL / PWL‘ / PWL“ [dB(A)] |
|---|---|
| DLphi | directivity correction (dB) |
| DLd | attenuation due to divergence (dB) |
| DLa | atmospheric absorption index (dB) |
| DLs | attenuation due to screening (dB) |
| DLv | attenuation due to foliage (dB) |
| DLb | attenuation due to effects of the ground (dB) |
| DLst | attenuation due to sound dispersion by buildings (dB) |
DIN 18005 (1987)
Calculation:
| Emission | Lw = Lw_in + Dt + 10 lg (length or area) + K0 [dB(A)] with correction for operating time Dt = 10 lg (T/Tref) dB |
| Immission | Lr = Lw - DLs - DLz - DLg - RL [dB(A)] |
Parameters:
| Lw | sound power level PWL / PWL‘ / PWL“ [dB(A)] |
|---|---|
| K0 | correction for solid angle (dB) |
| DLs | attenuation due to divergence (dB) |
| DLz | attenuation due to screening (dB) |
| DLg | attenuation due to buildings and/or foliage (dB) |
Nordic Pred. Method 1996
Calculation:
| Emission | Lw = Lw_in + Dt + 10 lg (length or area) + K0 [dB(A)] with correction for operating time Dt = 10 lg (T/Tref) dB |
| Immission | Lr = Lw + DLphi + DLd + DLa + DLg + DLs + DLv - RL [dB(A)] |
Parameters:
| Lw | sound power level PWL / PWL‘ / PWL“ [dB(A)] |
|---|---|
| K0 | directivity index (dB) |
| DLphi | directivity correction (dB) |
| DLd | attenuation due to divergence (dB) |
| DLa | atmospheric absorption index (dB) |
| DLg | attenuation due to ground effects (dB) |
| DLs | attenuation due to screening (dB) |
| DLv | attenuation due to foliage (dB) |
Nord 2000
Calculation:
| Emission | Lw = Lw_in + Dt + 10 lg (length or area) + K0 [dB(A)] with correction for operating time Dt = 10 lg (T/Tref) dB |
| Immission | LA,eq = Lw - Dgeo - Att - RL [dB(A)] |
Parameters:
| Lw | sound power level PWL / PWL‘ / PWL“ [dB(A)] |
|---|---|
| K0 | directivity index (dB) |
| Dgeo | attenuation due to divergence (dB) |
| Att | total attenuation (dB) |
Ljud fran windkraftwerk
Calculation:
| Emission | Lw = Lw_in + Dt + 10 lg (length or area) + K0 [dB(A)] with correction for operating time Dt = 10 lg (T/Tref) dB |
| Immission | Lr = Lw + DLd + DLa + DLg + DLs + DLv - RL [dB(A)] |
Parameters:
| Lw | sound power level PWL / PWL‘ / PWL“ [dB(A)] |
|---|---|
| K0 | directivity index (dB) |
| DLphi | directivity correction (dB) |
| DLd | attenuation due to divergence (dB) |
| DLa | atmospheric absorption index (dB) |
| DLg | attenuation due to ground effects (dB) |
BS 5228
Calculation:
| Emission | Lw = Lw_in + Dt + 10 lg (length or area) + K0 [dB(A)] with correction for operating time Dt = 10 lg (T/Tref) dB and K0 directivity index (dB) |
| Immission | Lr = Lw + Kh’ + soft + screen - RL [dB(A)] |
Parameters:
| Lw | sound power level PWL / PWL‘ / PWL“ [dB(A)] |
|---|---|
| l/a | length L (m) or area A (m²), for point sources = 1 |
| Facade | facade correction (dB) |
| Kh’ | attenuation due to divergence, „distance adjustment“ (dB) |
| soft | correction for soft ground (dB), G=1: soft = - 2 dB (d >= 25 m) |
| screen | attenuation due to screening (dB) |
| dir. | directivity correction (dB) |
Harmonoise
Calculation:
| Emission | Lw = Lw_in + Dt + 10 lg (length or area) + K0 [dB(A)] with correction for operating time Dt = 10 lg (T/Tref) dB and K0 directivity index (dB) |
| Immission | LA,eq = Lw + Dgeo - Att - RL [dB(A)] |
Parameters:
| Lw | sound power level PWL / PWL‘ / PWL“ [dB(A)] |
|---|---|
| Dgeo | attenuation due to divergence (dB) |
| Att | total attenuation (dB) |
| Ddir | directivity correction (dB) |
Concawe
Calculation:
| Emission | Lw = Lw_in + Dt + 10 lg (length or area) + K0 [dB(A)] with correction for operating time Dt = 10 lg (T/Tref) dB |
| Immission | LA,eq = Lw + D - K1 - K2 - K3 - K4 - K5 - K6 - RL [dB(A)] |
Parameters:
| Lw | sound power level PWL / PWL‘ / PWL“ [dB(A)] |
|---|---|
| K0 | directivity index (dB) |
| D | directivity correction (dB) |
| K1 | attenuation due to geometrical spreading (dB) |
| K2 | attenuation due to atmospheric absorption (dB) |
| K3 | attenuation due to ground effects (dB) |
| K4 | attenuation due to meteorological effects (dB) |
| K5 | attenuation due to source height effects (dB) |
| K6 | attenuation due to barrier effects (dB) |
NMPB-Ind-08
Calculation:
| Emission | Lw,i = LAwi + Dt 10 lg (length or area) [dB(A)] with correction for operating time Dt = 10 lg (T/Tref) dB and LAwi emission level in third-octave i [dB(A)], |
| Immission | Lr,i = Lw + Adiv + Aatm + Asol(H/F) + Adif(H/F) - RL [dB(A)] |
Parameters:
| Lw | sound power level per unit length LAwi / LAwi’ / LAwi“, in third-octave i [dB(A)] |
|---|---|
| Adiv | attenuation due to divergence (dB) |
| Aatm | atmospheric absorption index (dB) |
| AsolH | ground attenuation for homogeneous conditions (dB) |
| AsolF | ground attenuation for favorable conditions (dB) |
| AdifH | attenuation due to diffraction for homogeneous conditions (dB |
| AdifF | attenuation due to diffraction for favorable conditions (dB) |
CNOSSOS-EU
see NMPB-Ind-08
Schall 03 (2014)
see ISO 9613-2
HJ 2.4 (2009)
see ISO 9613-2