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Acoustic transmission

Posted 04.12.2016, 14:04 GMT-5 Acoustics & Vibrations Version 5.2 2 Replies

Irene Elliot
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Hello everybody,

I'm trying to simulate pressure (sound) transmission between two sides of air domain in the COMSOL transient pressure acoustic module. These two domains are cut by a metal sheet and i want to know how could i simulate the transmission through the metal?

Is there some specific boundary conditions to apply or another module than the acoustic-solid interaction to use ? Or maybe in can set a type of periodic boundary to receive the inflow and radiate the outlow of the metal sheet ?

Please let me know !
Thanks,

Irene

2 Replies Last Post 30.01.2017, 01:17 GMT-5
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Hello Irene Elliot

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Mads Herring Jensen COMSOL Employee

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Posted: 8 years ago 12.01.2017, 16:52 GMT-5
Hi Irene

Setting up a transmission loss problem in the time domain through a periodic structure is very difficult, if the incidence is not normal to the surface. In the frequency domain you can use the Floquet periodicity condition. Another challenge is setting up good radiation conditions at both sides of the system.

I would recommend to model this in the frequency domain and then use the transfer function to predict the time domain behavior.

There are several tutorials on this, here is one:
www.comsol.com/model/acoustic-transmission-loss-through-periodic-elastic-structures-1974

Best regards
Mads
Hi Irene Setting up a transmission loss problem in the time domain through a periodic structure is very difficult, if the incidence is not normal to the surface. In the frequency domain you can use the Floquet periodicity condition. Another challenge is setting up good radiation conditions at both sides of the system. I would recommend to model this in the frequency domain and then use the transfer function to predict the time domain behavior. There are several tutorials on this, here is one: https://www.comsol.com/model/acoustic-transmission-loss-through-periodic-elastic-structures-1974 Best regards Mads
Linus
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Posted: 8 years ago 30.01.2017, 01:17 GMT-5

Hi Irene

Setting up a transmission loss problem in the time domain through a periodic structure is very difficult, if the incidence is not normal to the surface. In the frequency domain you can use the Floquet periodicity condition. Another challenge is setting up good radiation conditions at both sides of the system.

I would recommend to model this in the frequency domain and then use the transfer function to predict the time domain behavior.

There are several tutorials on this, here is one:
www.comsol.com/model/acoustic-transmission-loss-through-periodic-elastic-structures-1974

Best regards
Mads


Hi Mads,

Floquet periodic boundary condition does not work with normal incidence wave?

--
Regards,
Linus Ang
[QUOTE] Hi Irene Setting up a transmission loss problem in the time domain through a periodic structure is very difficult, if the incidence is not normal to the surface. In the frequency domain you can use the Floquet periodicity condition. Another challenge is setting up good radiation conditions at both sides of the system. I would recommend to model this in the frequency domain and then use the transfer function to predict the time domain behavior. There are several tutorials on this, here is one: https://www.comsol.com/model/acoustic-transmission-loss-through-periodic-elastic-structures-1974 Best regards Mads [/QUOTE] Hi Mads, Floquet periodic boundary condition does not work with normal incidence wave? -- Regards, Linus Ang

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