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SRM II

The implementation follows the procedures as defined by the EU-Interim Report /2/ and the EC-Recommendation L 212/49 /107/. Both refer to edition 1996 of the „Reken- en Meetvoorschriften Railverkeerslawaai '96“ /81/ and not to more recent editions.

All Emissions at 0.5 m above railhead

All emission sources are placed at 0.5 m above the railhead instead of applying the sub-source heights as defined in the train class.

option deactivated(for train classes C9 and C9r only)option activated

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.

Use Non-Standard Reference Time D/E/N = 12/4/8

With the option „Use Non-Standard Reference Time“ deactivated the following time interval lengths will be considered: Day (D)=16 hours, Night (N)=8 hours. When this option is activated the time intervals and penalties on the „Reference Time“ tab (see Reference Time Tab) are taken into account.

This option has to be activated for calculations according to END (Environmental Noise Directive EU2002/49/EG-2002) in order to consider the number of trains (or the emission parameter) during the Evening period as well.

Note

The values displayed here are updated based on the defined time intervals DEN on the „Reference Time“ tab.

Air Absorption accord.to ISO 9613-1

In SRM II the air attenuation is based on spectral data at a temperature of 10°C and a relative humidity of 80%. In CadnaA, with activating this option the air absorption can, alternatively, be calculated according to ISO 9613-1 ISO-9613-1.

Meteorological Correction Cmet acc. to ISO 9613-2

SRM II defines a meteorological correction term CM. The equations used to determine CM are identical to the equations used in ISO 9613-2 to determine Cmet. However, instead of the variable C0 an upper limit of 3.5 dB is used.

In order to calculate long-term levels this option enables to replace the 3.5 dB by C0 and using the calculation procedure for Cmet as established by ISO 9613-2 ISO-9613-2-1996.

Other Properties: See Industry

This hint refers to the settings on the „Industry“ tab:

  • lateral diffraction
  • if distance smaller
  • temperature/relative humidity