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Posted Mar 20, 2012, 10:11 a.m. EDT Acoustics & Vibrations 6 Replies

esu
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does anyone know the difference between acoustic pressure and sound pressure?
6 Replies Last Post Mar 21, 2012, 6:38 a.m. EDT
Edgar Kaiser
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Posted: 1 decade ago Mar 20, 2012, 11:46 a.m. EDT
Sometimes people distinguish acoustics as audible sound (20 - 20.000 Hz) whereas sound is considered more general including low frequency pressure waves and ultrasound.
In physical terms sound pressure and acoustic pressure is the same.

Cheers
Edgar
Sometimes people distinguish acoustics as audible sound (20 - 20.000 Hz) whereas sound is considered more general including low frequency pressure waves and ultrasound. In physical terms sound pressure and acoustic pressure is the same. Cheers Edgar
esu
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Posted: 1 decade ago Mar 21, 2012, 5:50 a.m. EDT
Thanks for the reply Edgar I really appreciate it, but the thing is when I do the simulation I got two different 3D plots, one for acoustic pressure and the other for sound pressure, which is completely different and I use to think that both are the same, now I got no explanation for what I have done....so do you have any...
Thanks
Thanks for the reply Edgar I really appreciate it, but the thing is when I do the simulation I got two different 3D plots, one for acoustic pressure and the other for sound pressure, which is completely different and I use to think that both are the same, now I got no explanation for what I have done....so do you have any... Thanks
Edgar Kaiser
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Posted: 1 decade ago Mar 21, 2012, 6:04 a.m. EDT

Can you post your model? Delete mesh and solution if it is too big.
Can you post your model? Delete mesh and solution if it is too big.
esu
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Posted: 1 decade ago Mar 21, 2012, 6:09 a.m. EDT
here it is...
here it is...

Attachments:

Edgar Kaiser
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Posted: 1 decade ago Mar 21, 2012, 6:27 a.m. EDT
Look at en.wikipedia.org/wiki/Sound_pressure

The acoustic pressure is the pressure field in Pa, whereas the sound pressure level is a logarithmic db-value, referenced mostly to 0dB = 20 µPa, but the reference may be different in COMSOL. It is two ways to measure the same thing.

You should be able to verify that in your model by looking at a specific point.

Cheers
Edgar
Look at http://en.wikipedia.org/wiki/Sound_pressure The acoustic pressure is the pressure field in Pa, whereas the sound pressure level is a logarithmic db-value, referenced mostly to 0dB = 20 µPa, but the reference may be different in COMSOL. It is two ways to measure the same thing. You should be able to verify that in your model by looking at a specific point. Cheers Edgar
esu
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Posted: 1 decade ago Mar 21, 2012, 6:38 a.m. EDT
Alright,Thanks for the help !!

cheers
Alright,Thanks for the help !! cheers

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