Olive Tree Lab Terrain is a noise prediction software which simulates and predicts Outdoor Sound Propagation and Noise Barrier efficiency, taking into account geometrical spreading, atmospheric absorption, atmospheric turbulence, spherical wave complex ground impedance, reflection and diffraction effects of natural or man-made objects. The results are displayed as level vs frequency or level vs spatial mapping.

Based on state of the art calculation methods and ray detection techniques, which demand computational power and time, Olive Tree Lab Terrain is aimed at small scale projects as opposed to large noise mapping software. It addresses mostly fixed noise sources within a small area where one has control over most of the acoustic parameters involved in the sound calculations. It is based on high frequency resolution calculations, as opposed to just 1/3 octave band analysis, which can also be seen in 1/3 and 1/1 octave bands after being appropriately averaged.

OTL Terrain can be used for acoustics engineering, acoustics research and educational purposes. Olive Tree Lab Terrain can assist in designing acoustic solutions based on certain noise criteria in real time response, based on preliminary calculations during the design time.

 

Calculations

OTL Terrain is a calculations application based on the following methods and their limitations (Reference List):

• Hadden & Pierce Diffraction 3D model implemented with finite impedances faces using Salomons semi-analytical method including ground effects. Multiple barrier diffraction is calculated in a recursive way at any diffraction order. 
• In-house sound path detection methods.

• Ground effect using the One Parameter Theory of Chessell based on Delany and Bazley

• Reflections from finite surfaces based on Clay–Medwin’s work to include Fresnel zones contribution at any order level. 
• Atmospheric absorption based on ISO 9613 -1. 
• Turbulence coherence factor based on HARMONOISE WP3 

In this version no atmospheric refraction calculations are included.

Version 2.0 includes ISO 9613-2 calculation methods and Interior noise.

 

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