AFMG Network Forum

multalisk · Member

Hi there, I am very new to EASE. And when I start to choose Coefficient of Absorption on the materials, I got confused.
There will be many more questions to come. Please be patient with me.

If I want to model a room with just one adult standing in it.
No seat. Just a person. which generic term to use?
--> I choose this generic absorption "Audience per person Standing"............
then the question comes up, what is the face dimension to be put in EASE that represents this man, 30x30 cm or 60x60 cm face?
What is the dimension size for a person in EASE?

these few more generic absorptions are on a per person basis also

1- People in fully covered seats per person --> what face size represents a fully covered seat I should put in EASE?
2- People in wooden seats per person --> How big is one wooden seat?
3- Empty Seats, Leather or plastic covered, Per seat --> How big is one seat?

People in Upholstered Seats per square ft
If it's written as "Per square feet" Not per person. I think it's easier to understand.
If a room to be modeled has a space of 100 square feet, that can contain 100 persons,
I will choose People in Upholstered Seats per square ft for use the entire floor 100 square feet

Could you help define the size of per person in EASE please. Smile

Thank you

Bruce · Member

Audience per person was originally specified in Sabins. For the EASE database it has been converted to an equivalent area, meaning you specify it the same way for both. See the numerous papers and books on this subject by Beranek and others.

Lindsay S · Member

Applying a patch of seating when you are dealing with statistical analysis is relatively straightforward. The absorption and diffraction have been measured and extensively documented.

Where I have problems determining appropriate ways to build a model with audience is using ray tracing. Depending on the angle between the loudspeaker and the audience area, quite different results can come from having a flat patch of audience absorption on the floor and having a 3-D chunk of standing audience.

If you make a cube of standing audience members do you total the surface area of all the faces and make that equal to area of the top face? Do you give greater weight to face that receives the most energy from the loudspeaker? I know that this is a model and an approximation but this can make a significant difference.

Lindsay Smith
Seattle