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Old 14th December 2004, 02:18 PM   #1
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Default Boundary element analysis software

Does anyone know if there is a cost effective boundary element analysis software package out there?

Thanks

Andrew
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Old 14th December 2004, 05:18 PM   #2
Zaph is offline Zaph  United States
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Soundeasy is one.

Take a look at chapters 14 and 15 to get an idea of what it can do.

http://www.interdomain.net.au/~bodzio/Chapter_14.ZIP
http://www.interdomain.net.au/~bodzio/Chapter_15.ZIP
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Old 14th December 2004, 08:10 PM   #3
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Thanks Zaph for the quick reply, but the soundeasy software is FEM not BEM, and is configured for room acoustics. I am looking for BEM to model drivers on baffles.

Any other suggestions?

Andrew
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Old 14th December 2004, 11:51 PM   #4
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Two that I am aware of

http://www.pvconsultants.com/audio/d...ownloadbds.htm

The above requires microsoft Excell to use.

New version of The Edge baffle step simulator

The Edge by Svante who is a member here

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Old 15th December 2004, 12:41 AM   #5
Zaph is offline Zaph  United States
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Quote:
Originally posted by AndrewJ
Thanks Zaph for the quick reply, but the soundeasy software is FEM not BEM, and is configured for room acoustics. I am looking for BEM to model drivers on baffles.

Any other suggestions?

Andrew
Oh, when you said boundary, I assumed you meant in-room. If it's baffle diffraction sims you're looking for, look no further than Wintermute's suggestions. I use Paul V's sim now and then, it's nice. Mainly, I like how it handles rounded over edges.

Actually, Soundeasy does it too. Chapter 4, section 4.11. But it's really just a minor part of the package. It allows an infinite baffle measurement to be modeled in various enclosures in advance of actually picking and building and enclosure. If a baffle diffraction sim is all you need, go for one of the free ones.
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Old 15th December 2004, 02:05 PM   #6
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Thanks again for the replies, but none of these programs are based on boundary element analysis (except for the room calculations in Soundeasy). They all use ray tracing and the image method to calculate diffraction.
I am looking for true BEM analysis software so I can model the effect of cones and domes on baffles, and model for example the effect that cone depth has on response.

Thanks

Andrew
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Old 15th December 2004, 05:01 PM   #7
Ron E is offline Ron E  United States
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Quote:
Originally posted by AndrewJ
Thanks again for the replies, but none of these programs are based on boundary element analysis (except for the room calculations in Soundeasy). They all use ray tracing and the image method to calculate diffraction.
I am looking for true BEM analysis software so I can model the effect of cones and domes on baffles, and model for example the effect that cone depth has on response.
Do a search for free mechanical engineering software. I thought I saw a couple demo packages that might do BEM.

If you look at Art Ludwig's soundpage, he solves the equations for sound sources on a cone shaped radiator and the radiatoin pattern didn't change much except in the near field IIRC - although that analysis didn't account for cone flexure, etc....
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