I'm trying to get the sound propagation in a small cylindrical cavity, but calculation fails.

[Andrew]

Hello, I just found I-SIMPA and i decided to try it on a small hobby project that I have. I want to do some (wooden) headphones and i wanted to see if the shape of the cavity housing the driver has any significant impact in how sound will propagate and especially which frequencies will be affected most. I'm not sure if I-SIMPA is suitable for this task.

What I'm trying to do is to visualize the sound propagation in a small cylindrical cavity (4cm diameter). Model was drawn in SketchUp and exported as 3ds. Importing in I-SIMPA seems to disregard units (unless my model has 40m diameter!!). Anyway, I defined surfaces (10% absorbtion), receivers from those surfaces, sound source and I tried to run the calculation (all based on this tutorial: http://i-simpa-wiki.readthedocs.io/en/latest/tutorial_teaching_room.html

Problem is that the calculation fails as you can see in the attachment (TheorieClassique.exe :Tetrahedalization file is empty, the calculation can't be done !). I followed the tutorial's steps and there I get the expected result, for the tutorial, but when I try to do the same thing with my own model, it fails. For reference I attached the 3DS file too.

Is it possible to visualize the sound propagation on a plane receiver that goes outside the scene model? It seems the documentation is under (re)construction, which doesn't really help much a new user...

Thank you very much, I would really appreciate some help here, because I need to test several shapes, one includes a cavity that is half a sphere.

[nico....@gmail.com]

Hi,

I-Simpa and Spps has been designed for room acoustics. So it may not be the best choice for this kind of study.

You should try AcouSTO, its also an open source project:

http://acousto.sourceforge.net

best regards,