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Schall 03 (1990)

Dialog Configuration, tab „Railroad“ for Schall 03 (1990)(option „strictly according to Schall 03“ deactivated)

Strictly according to Schall 03

With this option activated, CadnaA will calculate for railways

  • only the first-order reflections, irrespective of the order of reflection specified on the „Reflection“ tab,
  • considering a railway correction of 5 dB,
  • no lateral diffraction at obstacles,
  • no attenuation by built-up areas, and
  • no meteorological correction.

Note

All other settings made on the „Reflection“ tab, "Conditions for Calculation of Reflection", such as the search radius for reflecting objects, will apply even when the option „Strictly according to Schall 03/Schall-Transrapid“ is activated (see Reflection Tab).

Calc exactly one reflection order

With this option deactivated the maximum order of reflection is specified via the „Reflection“ tab (see Reflection Tab).

No Lateral Diffraction

When this option is deactivated the lateral diffraction will be considered which is normally not relevant to the receiver level due to the extension of the railway sources (line sources) in normal situations

No Housing Attenuation

By default, the attenuation by built-up areas is not considered by Schall 03. When this option is deactivated the CadnaA-object „Built-Up Area“ causes a screening effect.

Note

The housing attenuation DG is calculated accord. to VDI 2714 (see Built-Up Areas and Foliage). This value is not displayed on the calculation protocol in a separate column (see CadnaA-manual „Attributes, Variables, and Keywords“, Protocol attributes).

Railway Correction (dB)

Any entered railway correction will be considered upon calculation. Thus, to consider no railway correction a value of 0 dB has to be entered.

see also Strictly according to Schall 03

No Meteorology (Cmet see Industry)

No meteorological correction is established by Schall 03. In CadnaA, nevertheless, the meteorological effect can be considered by deactivation of this option. In this case, the settings on the list box „Meteorology“ on the „Industry“ tab are relevant.

Note

The value of Cmet will be calculated according to ISO 9613-2. This value is not displayed on the calculation protocol.

see also ISO 9613 (1996) and ISO 9613 (2024)

Use Non-Standard Reference Time D/E/N

With performing calculations according to END (Environmental Noise Directive EU2002/49/EG-2002), this option has to be activated. In this case, the number of trains (or the emission parameter) during the Evening period is considered as well. The values displayed on the „Reference Time“ tab („D/E/N=12/4/8 h“) will be updated based on the defined time intervals (see Reference Time Tab and Evaluation Parameters Tab).

Calculation acc. to VBUSch

relevant for Germany only!

The German method VBUSch is just relevant in conjunction with evaluations for END EU2002/49/EG-2002. First, deactivate the option „Strictly according to Schall 03“ and activate the option „Calculation acc. To VBUSch“.

The main modifications are:

  • The setting for lateral diffraction is not possible any longer.
  • No railway bonus specifiable.
  • Cmet is calculated automatically (C0 (D/E/N)=2/1/0 dB).

Note

When not considering Cmet and with the same emission D/E/N a level difference between Lden and Ln of 6.395 dB results. Since Cmet is automatically taken into account in CadnaA, the difference is usually smaller than this value.

  • fixed reference Time Day/Evening/Night = 12h/4h/8h
  • The penalty for railway lines with wooden sleepers is 2 dB (instead 0 dB according to Schall 03).
  • For maximum speeds vmax>200 km/h an additional aerodynamic noise source is included at a source height of 4,5 m.

Self-Screening at Buildings

For calculations according to the German railway guideline Schall 03 the self-screening of buildings with backside receivers can alternatively be considered or not. This option refers to a requirement stated by Schall 03 (section 7.5) that „at buildings with gaps in between ... just the screening by the first row of buildings, being next to the railway line, shall be considered ...“ (translated from German).

To do so, a string variable SCREEN_TEST_ID=1 (on the dialog Memo-Window) is defined for the respective building. With the variable being set it will be checked whether the ID of a receiver corresponds with the building‘s ID. With corresponding IDs the respective building is screening, otherwise not.

This option enables to respect the detailed specification of Schall 03, just to consider the screening by the first row of buildings, while for backside facades the self-screening effect shall be included.