Visualisation of Wave Acoustics

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Visualisation of Wave Acoustics

Postby jonessy » Tue Oct 26, 2010 6:46 pm

Hi All,

As some of you may know I'm now working on my doctorate which has quite a lot of elements in acoustics modelling.
I'm employing a numerical method to solve the wave equation in the time domain, so discrete time-space values of pressure or particle velocity come naturally with the solution.
(more details upon request).

As it turns out, this is not only a good way to calculate IRs of rooms, but also for visualising sound propagation.

So I thought it would be nice to take some basic wave behavior and acoustic phenomena, and be able to show how they occur.

Since these things weigh a ton, I threw everything in a u-toob channel:
http://www.youtube.com/user/jonsheaffer

(wanted to embed something here for an example, but no idea how to do this)

Cheers, :)

Jon.
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Re: Visualisation of Wave Acoustics

Postby bert stoltenborg » Wed Oct 27, 2010 10:29 am

Nice!.
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Re: Visualisation of Wave Acoustics

Postby bert stoltenborg » Wed Oct 27, 2010 1:05 pm

Hey Jon,

Your a math canon, is sound pressure in phase with voice coil (or membrane) speed or with voice coil acceleration?
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Re: Visualisation of Wave Acoustics

Postby avare » Wed Oct 27, 2010 1:26 pm

Marvelous. Thank you Jon.

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Re: Visualisation of Wave Acoustics

Postby jonessy » Wed Oct 27, 2010 2:42 pm

Cheers guys.

Bert -

If I understand your question correctly, then no.

The source term is a pressure source which is obtained by considering a volume velocity source; delayed and filtered, hence out of phase.
(this is an outcome of discretising the source function in a way that it satisfies its respective PDE).

What you see in the animations (even at the source location) is the change of acoustic pressure, caused by the aforementioned source.

Hope this answers the question (and if I misunderstood - then please tell).

Cheers,
:)
Jon.
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Re: Visualisation of Wave Acoustics

Postby J.F.Oros » Thu Oct 28, 2010 5:25 pm

Wow, nice work Jon!

Did you try to model some stationary waves ? I'm not sure how hard is it to make all the boundaries rigid/reflective, but it would be interesting to see how the waves become stationary after one/few cycles.

PS : regarding the youtube videos embedding, Dan might have disabled this when he upgraded the forum (same as it is with the user avatars, except those didn't work before either).
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Re: Visualisation of Wave Acoustics

Postby jonessy » Thu Oct 28, 2010 7:22 pm

You mean 'standing waves'?
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Re: Visualisation of Wave Acoustics

Postby J.F.Oros » Fri Oct 29, 2010 9:36 am

Oh yeah, standing waves of course :D

Sorry, I was kind of tired when i wrote that (coming from a long trip) and used the romanian version of the word (we say "stationary waves" here, on a direct translation)
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Re: Visualisation of Wave Acoustics

Postby Ido » Thu Nov 04, 2010 11:54 am

Jonathan, thanks, really nice.
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