Saturday, January 20, 2018

The use of Olive Tree Lab-Acoustics Lib for the Calculation of Room Resonances

Below are Olive Tree Lab- Acoustics Lib results superimposed on the results of an acoustical paper which compares BEM and other methodologies with sound measurements.

We have estimated that the calculations of the paper must have included up to 80th order of reflections, therefore any discrepancies are due to the limited reflection orders used in our calculations. Superimposed on paper’s results are our results for 18th order reflection from all room surfaces, the combination of four surfaces and the combination of two surfaces, in order to demonstrate the buildup of the final results with all six walls. Also included are some mappings for four and two walls.

 

An ordinary room with source and receiver. Floor is carpeted, having a flow resistivity of 150kPa/m2. Walls and ceiling are given a flow resistivity of 10,000kPa/m2

An ordinary room with source and receiver. Floor is carpeted, having a flow resistivity of 150kPa/m2. Walls and ceiling are given a flow resistivity of 10,000kPa/m2 - with only 4 vertical walls participating in the calculation

An ordinary room with source and receiver. Floor is carpeted, having a flow resistivity of 150kPa/m2. Walls and ceiling are given a flow resistivity of 10,000kPa/m2 - with a combination of other 4 walls.

An ordinary room with source and receiver. Floor is carpeted, having a flow resistivity of 150kPa/m2. Walls and ceiling are given a flow resistivity of 10,000kPa/m2 - with a combination of other 4 walls

An ordinary room with source and receiver. Floor is carpeted, having a flow resistivity of 150kPa/m2. Walls and ceiling are given a flow resistivity of 10,000kPa/m2 - with the participation of 2 walls.

An ordinary room with source and receiver. Floor is carpeted, having a flow resistivity of 150kPa/m2. Walls and ceiling are given a flow resistivity of 10,000kPa/m2 - with the participation of floor and ceiling

An ordinary room with source and receiver. Floor is carpeted, having a flow resistivity of 150kPa/m2. Walls and ceiling are given a flow resistivity of 10,000kPa/m2 - with the participation of the other 2 walls.

3D sound mapping of the sound field with the participation of the 4 vertical walls. Mapping area is at zero height. Legend shows calculation information (Lp After stand for SPL at Receivers).

 

2D sound mapping of the sound field with the participation of the 2 vertical walls. There are 3 mapping areas, 1) on the wall behind source, 2) at zero height between the walls, 3) a vertical area between the walls as shown below. Legend shows calculation