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How to bond two panels together in simulating sound waves in the coincidence region

Posted 11 sept. 2021, 13:26 UTC−4 Acoustics & Vibrations Version 5.3 4 Replies

John Ching
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I am trying to simulate sound waves hitting two flat panels, which is build upon the Tutorial Sound Transmission Loss in a Concrete wall. I am trying to study the behaviour of the coincidence effect by modelling different panels. My model has 3 blocks, 2 of them are MDF panels and 1 is an air domain block with perfectly matched layers.

How do I set two 4.5mm thick panels to be "glued" together so that it behaves like a single 9mm thick panel?

4 Replies Last Post 28 sept. 2021, 23:03 UTC−4
Jeff Hiller COMSOL Employee

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Posted: 4 years ago 13 sept. 2021, 10:53 UTC−4

Hello John,

If the two panels are glued together so that they behave like a single 9mm panel, why not model them as a single 9mm block?

Best,

Jeff

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Jeff Hiller
Hello John, If the two panels are glued together so that they behave like a single 9mm panel, why not model them as a single 9mm block? Best, Jeff
John Ching
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Posted: 4 years ago 25 sept. 2021, 04:03 UTC−4

Hi Jeff,

It is because I would like to also simulate strips of glue bonding 2 panels together, not a completely bonded surface. The strips of glue would be thin lines running between the panels, and that is the setting I have trouble figuring out.

Cheers

Hi Jeff, It is because I would like to also simulate strips of glue bonding 2 panels together, not a completely bonded surface. The strips of glue would be thin lines running between the panels, and that is the setting I have trouble figuring out. Cheers
Dave Greve
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Posted: 4 years ago 27 sept. 2021, 11:24 UTC−4

You need to know the mechanical properties of the glue. The glue needs to be a separate domain (or domains). Since the glue is probably thin you may need to use a swept mesh to keep the number of elements from becoming prohibitively large.

You need to know the mechanical properties of the glue. The glue needs to be a separate domain (or domains). Since the glue is probably thin you may need to use a swept mesh to keep the number of elements from becoming prohibitively large.
John Ching
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Posted: 4 years ago 28 sept. 2021, 23:03 UTC−4

Hi Dave,

Thank you, that is a good suggestion.

Hi Dave, Thank you, that is a good suggestion.

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