For each simplification there will be a degree of error added to the model. The following table of accuracy is taken from ISO9613-2 based on tests without screening or reflections Average height of source and receiverĬomputer modelling requires a simplification of real-world conditions into basic components. It is essential to consider that modelling is only ever an estimate and real-world measurements may differ greatly. Alternatively, the average of varying meteorological conditions over months or years.įor more information about the calculations and their limitations, refer to ISO9613 parts 1 and 2.A moderate ground-based temperature inversion, such as is common on clear, calm nights should not significantly affect accuracy.Wind speed between approximately 1-5 m/s, measured 3-11 m above the ground.This is defined as a wind direction within an arc of 90 degrees with the wind blowing from source to receiver. Below are suitable conditions taken from ISO9613-2. Sound propagation is affected by variations in meteorological conditions. not floating above the ground or with empty sections / perforations. Screens are flat with no significant transmission of sound through or under the screen.
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