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Transmission loss in simple model
Posted Jun 25, 2012, 11:38 a.m. EDT Acoustics & Vibrations, Structural Mechanics 3 Replies
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Hi,
I'd like to analyze the frequency dependency of the transmission loss (TL) of a simple structural/acoustic model, which is depicted here: www.alfwarnock.info/sound/images/tlsuite.gif
Some problems I stumbled upon:
1) I'm not sure how to apply the acoustic load. I want to model a pressure wave that excites the entire frequency spectrum (so, swept sine or white noise).
2) The pressure in the right reception room does not change, even though the middle panel deforms.
If anyone can help to get me started, that would be great!
I'd like to analyze the frequency dependency of the transmission loss (TL) of a simple structural/acoustic model, which is depicted here: www.alfwarnock.info/sound/images/tlsuite.gif
Some problems I stumbled upon:
1) I'm not sure how to apply the acoustic load. I want to model a pressure wave that excites the entire frequency spectrum (so, swept sine or white noise).
2) The pressure in the right reception room does not change, even though the middle panel deforms.
If anyone can help to get me started, that would be great!
3 Replies Last Post Sep 21, 2016, 10:33 p.m. EDT
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Posted:
1 decade ago
Hi Frits
You'll need to run the acsh (acoustic-shell interaction frequency domain) module. You'll need only the air in both room modeled with rigid reflective walls, and the plate as a shell model.
1) There is no "white noise" option - use stepped sine by specifying the start, end and step size frequencies.
2) Use one or more Sound Power Point Sources in the left room or make the left wall of the left room to provide a "plane wave radiation" (add this function from the list) and add an "incident pressure field" with a specified amplitude (option under the plane wave radiation). The second option will give you a normal incidence TL while the first option a random incidence TL.
Good luck!
You'll need to run the acsh (acoustic-shell interaction frequency domain) module. You'll need only the air in both room modeled with rigid reflective walls, and the plate as a shell model.
1) There is no "white noise" option - use stepped sine by specifying the start, end and step size frequencies.
2) Use one or more Sound Power Point Sources in the left room or make the left wall of the left room to provide a "plane wave radiation" (add this function from the list) and add an "incident pressure field" with a specified amplitude (option under the plane wave radiation). The second option will give you a normal incidence TL while the first option a random incidence TL.
Good luck!
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Posted:
1 decade ago
But what model of material should be used and what should be the equation in variables list?
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Posted:
8 years ago
Hi KarelR,
I managed to perform the analysis based on your suggestions. It matches relatively well with experimental results. Thank you for the tips.
I managed to perform the analysis based on your suggestions. It matches relatively well with experimental results. Thank you for the tips.