Road
RLS-90
Calculation (Road):
| Emission | Lw = Lm,E + 19.2 - Drefl + K + 10 lg (length) [dB(A)] |
|---|---|
| Immission | Lr = Lw + Ds + Dbm + Dz - RL [dB(A)] |
Calculation (Parking Lot):
| Emission | Lw = L*m,E + 17 + 19.2 [dB(A)] |
|---|---|
| Immission | Lr = Lw + Ds + Dbm + Dz - RL [dB(A)] |
Parameters:
| LmE | emission level Lm,E / L*m,E at distance 25 m perpendicular from the road’s axis / from the parking lot‘s centre [dB(A)] |
| Dl | 10 lg (length) dB |
| Dstg | gradient correction - provided the option "Road Gradient: auto" is used, otherwise the gradient correction is included in LmE! |
| Drefl | level increase due to multiple reflection (dB) |
| K | correction for crossings and junctions with traffic lights (dB) |
| Ds | attenuation due to divergence (dB) - includes air absorption and conversion LmE -> Lw‘ |
| Dbm | attenuation due to meteorology and ground (dB) |
| Dz | screening attenuation of a barrier (dB) |
RLS-19
Calculation (Road):
| Emission | Lw‘ + 10 lg (length) [dB(A)] |
|---|---|
| Immission | Lr = Lw + Drefl + Dln + Dk,kt - Ddiv - Datm + max(Dgr, Dz) - Drv [dB(A)] |
Calculation (Parking Lot):
| Emission | Lw“ + 10 lg (area) [dB(A)] |
|---|---|
| Immission | Lr = Lw - Ddiv - Datm + max(Dgr, Dz) - Drv [dB(A)] |
Parameter:
| Lw‘ / Lw“ | sound power level per unit length -/per unit area [dB(A)] |
|---|---|
| Dl/a | 10 lg (length/m) dB bzw. 10 lg (area/m²) dB |
| Drefl | level increase due to multiple reflection (dB) |
| Dln | gradient correction (dB) |
| Dk,kt | correction for traffic crossings (dB) |
| Ddiv | attenuation due to divergence (dB) |
| Datm | attenuation due to atmospheric absorption (dB) |
| Dgr | attenuation due to gourd effect (dB) |
| Dz | attenuation due to screening (dB) |
| Drv | reflection loss (dB) |
RVS 4.02
Calculation:
| Emission | La1 = L1A,eq [dB(A)] |
|---|---|
| Immission | Lr = La1 + Dphi + DLd + DLa + DLs + DLv + DLb - 3 + DLst - RL [dB(A)] |
Parameters:
| La1 | emission level 25 m perpendicular from the road’s axis [dB(A)] |
|---|---|
| Dphi | directivity correction, Dphi = 10 lg (phi/180°) (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) |
STL 86
Calculation:
| Emission | Lw = Lr,e - Drefl + 10 lg (length) + model correction with low traffic rates (check-box „K1=0“ activated): Lw = Lr,e - Drefl + 10 lg (length) + model correction + corr_1 |
| Immission | Lr = Lw + Ds + Dbm + Dz - RL |
Parameters:
| LmE | emission level 25 m perpendicular from the road’s axis [dB(A)] |
|---|---|
| Dl | 10 lg (length) dB |
| Dstg | gradient correction |
| Drefl | level increase due to multiple reflection (dB) |
| K | model correction (dB) |
| Ds | attenuation due to divergence (dB) |
| Dbm | attenuation due to meteorology and ground (dB) |
| Dz | screening attenuation of a barrier (dB) |
DIN 18005 (1987)
Calculation (Road):
| Emission | Lw = LmE + 19.2 - Drefl + K + 10 lg (length) [dB(A)] with Drefl level increase due to multiple reflection (dB), K correction for interference of crossings and junctions with traffic lights (dB), value of K according to RLS-90 |
| Immission | Lr = Lw - DLs - DLz - DLg - RL [dB(A)] |
Calculation (Parking Lot):
| Emission | Lw = L*m,E + 17 + 19.2 [dB(A)] |
|---|---|
| Immission | Lr = Lw + DLs + DLz + DLg - RL [dB(A)] |
Parameters:
| LmE | emission level Lm,E / L*m,E at distance 25 m perpendicular from the road’s axis / from the parking lot‘s centre [dB(A)] |
| DLs | attenuation due to divergence (dB) |
| DLz | screening attenuation of a barrier (dB) |
| DLg | attenuation due to meteorology and ground (dB) |
Nordic Pred. Method 1996
Calculation:
| Emission | Lw = Laeq*,10m [dB(A)] |
|---|---|
| Immission | Lr (LA,eq) = Lw + DLav + DLms + DLalpha + DLts + DLka + DLmg - RL [dB(A)] |
Parameters:
| Lw | sound power level Laeq*,10m [dB(A)] |
|---|---|
| DLav | average distance correction (dB) |
| DLms | ground and screen correction (dB) |
| DLalpha | correction for angle of view (dB) |
| DLts | correction for thick screen (dB) |
| DLka | correction for short distance to the road (dB) |
| DLmg | correction for multiple reflections (dB) |
NMPB-Routes-96
Calculation:
| Emission | Lw = LAwi’ + 10 lg (length) + R(i) [dB(A)] with LAwi’ emission spectrum in octaves [dB(A)], R(i) value of reference spectrum for road noise (dB) |
| Immission | Lr = Lw + Adiv + Aatm + Asol(H/F) + Adif(H/F) - RL [dB(A)] |
Parameters:
| Lw | sound power level per unit length LAwi’, per 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) |
NMPB-Routes-2008
Calculation:
| Emission | Lw,i = LAwi’ + 10 lg (length) + R(i) [dB(A)] with LAwi’ emission level in third-octave i [dB(A)], R(i) value of reference spectrum for road noise (dB) |
| Immission | Lr = Lw + Adiv + Aatm + Asol(H/F) + Adif(H/F) - RL [dB(A)] |
Parameters:
| Lw | sound power level per unit length 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-Routes-2008, and further:
| dGrad | gradient correction (dB) - with option „Gradient: auto“ (see CNOSSOS-EU (Road) in the CadnaA Reference Manual) |
| dAcc | correction for accelerating and decelerating vehicles at intersections (dB) |
CRTN
Calculation:
| Emission | Lw = L10,18h [dB(A)] |
| Immission | Lr = Lw + Cdist + Cbar + Ctheta + Crefl (Reflect. via Correction.) + K [dB(A)] Lr = Lw + Cdist + Cbar + Ctheta - RL (Reflect. via mirror sources) + K [dB(A)] |
Parameters:
| Lw | emission level L10,18h [dB(A)] |
| Cdist | distance correction (dB) NOTE - In CRTN, the ground cover correction (ground absorption) for unobstructed propagation (non-diffracted rays) is included in Cdist. |
| Cbar | barrier correction (dB) |
| Ctheta | angle correction (dB) |
| Crefl | correction for reflection (dB) |
| K | low traffic correction (dB) |
TNM
Calculation:
| Emission | - |
|---|---|
| Immission | - |
Parameters:
| Lw | emission level Ltraf,ref under reference conditions (50 ft from infinite long, straight road) [dB(A)] |
| Ad | adjustment for distance (dB) |
| Aair | adjustment for atmospheric absorption (dB) |
| Agr | adjustment for shielding and ground effects (dB) |
| Afol | adjustment for attenuation due to foliage (dB) |
Czech Method
Calculation:
| Emission | Lw = LAeq,7.5m - Drefl + 10 lg (length) [dB(A)] with Drefl level increase due to multiple reflection (dB) |
| Immission | Lr = Lw + Ds + Dbm + Dz - RL [dB(A)] |
Parameters:
| Lw | emission level LAeq,7.5m [dB(A)] |
|---|---|
| Ds | attenuation due to divergence (dB) |
| Dbm | attenuation due to meteorology and ground (dB) |
| Dz | screening attenuation of a barrier (dB) |
SonRoad
Calculation:
| Emission | Lw = Lw,A’ + 10 lg (length) [dB(A)] |
|---|---|
| Immission | Lr = Lw - Adiv - Aatm - Agr/bar/refl(H/F) - Afol [dB(A)] |
Parameters:
| Lw | sound power per unit length Lw,A’, per third-octave [dB(A)] |
| Adiv | attenuation due to divergence (dB) |
| Aatm | atmospheric absorption index (dB) |
| Agr/bar/refl | attenuation due to ground absorption/barriers/reflection, for homogeneous (H) and favorable conditions (F), (dB) |
| Afol | attenuation due to foliage (dB) |
SonRoad18
see ISO 9613, plus:
| Dgrad | gradient correction (dB), with option „Road Gradient: auto“ selected |
|---|---|
| Dtheta | directivity correction (dB) |
With option „Road Gradient: Input (%)“ the correction is included in the sound power level.
HJ 2.4 (2009)
Calculation:
| Emission | Lw = Le7.5 + Dslope + Drefl [dB(A)] |
|---|---|
| Immission | Lr = Lw + Ddiv + Dphi - Aatm - Agr - Abar + Ainters - RL [dB(A)] |
Parameters:
| Le7.5 | emission level at 7.5 m distance from the road’s axis [dB(A)] |
|---|---|
| Dslope | gradient correction (dB) - from AUTO, otherwise in Le7.5 |
| Drefl | level increase due to multiple reflection (dB) |
| Ddiv | attenuation due to divergence (dB) |
| Dphi | angle correction (dB) |
| Aatm | atmospheric absorption index (dB) |
| Agr | attenuation due to ground absorption (dB) |
| Abar | attenuation due to screening (dB) |
| Ainters | correction due to crossings (dB) |