Olive Tree Lab-Suite 4.3, 64-bit version is now available, improving stability during heavy calculations!

OTL-Suite goes far beyond the typical acoustical analysis in the fields of

• environmental acoustics
• architectural acoustics.

Below are some of its versatile features and the applications they can be used for:

Wind Farm - Atmospheric Refraction: OTL-Suite now includes modelling the effects of Atmospheric Refraction in a non-homogeneous atmosphere due to a temperature gradient and wind profile. Modelling the propagation of sound through such a non-homogeneous atmosphere is one of the most difficult tasks in outdoor acoustics due to the multiple physical phenomena that need to be accounted for such as creeping waves and many others, but it is essential for analysing environments spanning more than 200m - a particular concern to the wind farm industry.

Open Music Venues & Public Nuisance: Atmospheric Refraction coupled with Source directivity can calculate and assess the effects of sound propagation from open venues such as stadiums, to communities not just nearby but located kilometres away, without the need for additional software. Such modelling greatly assists both concert organizers and local authorities alike in assessing the impact of loud sound events. Since OTL-Suite covers an extended frequency range from 0 to 100 kHz at any resolution down to 0.001 Hz the low frequency range responsible for most of entertainment noise, can easily be analysed.

Loudspeaker Directivity: OTL-Suite v4 is capable of taking into account the directivity of loudspeakers by importing standard CLF files. If an Impulse Response is calculated, the calculated transfer function can be listened to as a Binaural Auralisation.

Scattering and Edge Diffraction: Due to the wave based nature of OTL-Suite’s calculation engine, scattering and edge diffraction phenomena, including the difficult to calculate seat-dip effect in theatres, can be explicitly calculated without resorting to simplified models.

Surface & Structures Directivity: Use the Polar Plotter to visualize the directional properties of different surfaces and structures, for example predicting the effect of overhead canopies or reflectors in rooms dedicated for music and/or speech.

Room Modes: An additional phenomenon which the wave based nature of OTL-Suite’s calculation engine allows for, is the calculation of room resonances. By taking into account edge diffractions & finite surface size reflections using spherical wave angle depended extended reacting surfaces impedance to get complex pressures, the non-diffused field room response is calculated.

Multilayered Structure Builder: OTL-Suite is also the first acoustics software to include a Multilayered Structure Builder (MLSB) based on the Transfer Matrix Method to calculate surface impedance, sound absorption coefficients (seen from both sides of the structure) and sound transmission loss of structures. Now, 3D model entities may be assigned either surface impedance or absorption coefficients calculated directly using the MLSB, without resorting to 3rd party software. Once building acoustics functionality is also included in OTL-Suite, model entities will possess sound reduction indices as well. The MLSB currently calculates the following:  
     

• Sound Reduction Index (10-10kHz) in narrow bands,
• Rw(C;Ctr) ratings at 100-3150 Hz and 50-5kHz,
• equivalent statistical absorption coefficients 10-10kHz in narrow bands,
• ISO 11654 absorption coefficient,
•  a(w), Class and NRC ratings of the structure
• integration angles 78 and 90 degrees
• complex surface impedance of the structures, in narrow bands.

Users can specify unlimited numbers of layers, see results in high resolution in an extended frequency range from 10 Hz to 10kHz, export of values in both high resolution frequency analysis and 1/3 octave analysis, as well as Front-Back, Back-Front performance (in sound absorption and impedance calculations).

For more information or to download the latest version Trial
Are you going to Euronoise2018? Meet us at Booth 25 together with Infra QSources and Eckel Noise Control Technologies.