Sound Propagation (Nord2000)

exSOUND2000 now replaced by SPL2000

State-of-the-art prediction

News: Now available for on-line purchase.  For educational pricing Contact us a cth@delta.dk

The present version of exSound2000 has been updated to SPL 2000 so that the sound propagation algorithms are in accordance with the 2006 revision of Nord2000 including new source models and a greatly improved user interface.

The conditions of the three different computation methods available in exSound2000 are hereafter:

Extended source: The method is fully in accordance with 2006 revision of Nord2000

Infinite straight road: The method is only in accordance with 2006 revision of Nord2000 with respect to sound propagation whereas the Nord2000 road traffic source model has not been updated (the present version contains the original source model from 2001)

Infinite straight rail track: The method is fully in accordance with 2006 revision of Nord2000 as the Nord2000 rail traffic source model was not been changed in the 2006 revision

The most accurate noise propagation modelling software

The DELTA family of Sound Prediction Software makes it easy to predict sound with higher accuracy, thanks to the Nord2000 model. The new model has many important advantages compared to earlier methods.

Benchmark testing carried out in the European research project Harmonoise has enabled DELTA to further improve the advanced engineering algorithms in exSOUND2000 dealing with wind influence on the effect of noise barriers and screens.

A display facility in exSOUND2000 has been added allowing easy graphical check of input such as source and receiver positions, terrain profile as well as wind direction and speed.

  • Accuracy
    It is based on a mathematical model of actual physical phenomena, whereas earlier models were based on approximations derived from experimental data. This gives greater robustness and dynamic range of calculations.
  • Frequency Resolution
    The 1/3 octave capability gives better frequency resolution than previous models with 1/1 octave resolution.
  • Meteorological Modelling
    It provides a far better modelling of meteorological conditions, which can have a significant impact on the accuracy of the model. In spite of the greater mathematical complexity, the user interface represents a simplification compared to earlier noise prediction models. In addition, the high computing capability of modern PCs makes it possible to use mathematical models which could not be realistically computed in a reasonable amount of time just a few years ago.

Product Description

SPL2000, provides rapid computation of full octave and 1/3 octave sound levels for stationary sound sources and non-stationary sources, such as trains and linearly moving vehicles. The influence of source sound power, meteorological conditions, and terrain is considered in the model. Computation is based on a single receiving point and no contour mapping.

Please note the SPL2000 is specifically geared for scientific and research use, and requires a thorough understanding of the underlying principles behind the Nord2000 Prediction model. The exSOUND2000+ demo is fully functional except for built-in random errors of ±1-3 dB.

Download exSOUND2000+ User’s Guide (PDF: 500 KB)

Educational Licence Pricing and Conditions

Purchase from our secure on-line store

Background for the Nord2000 Research Project

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