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Sound Absorption Coefficient of Materials

Posted 19 feb 2012, 09:20 GMT-5 Acoustics & Vibrations, Materials, Modeling Tools & Definitions, Parameters, Variables, & Functions Version 4.2, Version 4.2a, Version 4.3 4 Replies

Siu-Kit Lau
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Does anyone know how to simulate the "Sound Absorption Coefficient" of materials? I tried to build a waveguide (impedance tube) on top of the materials, but it doesn't work for high frequency.
4 Replies Last Post 10 gen 2013, 12:46 GMT-5
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Hello Siu-Kit Lau

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Wang Charles
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Posted: 1 decade ago 13 dic 2012, 03:48 GMT-5
Hi

I also want to know how to build a model for impedance tube, for the simulation of sound reflection and absorption coefficient.
Hi I also want to know how to build a model for impedance tube, for the simulation of sound reflection and absorption coefficient.
RVN
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Posted: 1 decade ago 8 gen 2013, 11:03 GMT-5

Does anyone know how to simulate the "Sound Absorption Coefficient" of materials? I tried to build a waveguide (impedance tube) on top of the materials, but it doesn't work for high frequency.



Have you solved the problem yet? The higher the frequency is, the narrower the tube must be. You have to have plane waves in an impedance tube and the higher the frequency is the more viscous edge effects and non-planar waves will come into play, ruining the results at higher frequencies.
[QUOTE] Does anyone know how to simulate the "Sound Absorption Coefficient" of materials? I tried to build a waveguide (impedance tube) on top of the materials, but it doesn't work for high frequency. [/QUOTE] Have you solved the problem yet? The higher the frequency is, the narrower the tube must be. You have to have plane waves in an impedance tube and the higher the frequency is the more viscous edge effects and non-planar waves will come into play, ruining the results at higher frequencies.
Rostand Tayong
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Posted: 1 decade ago 10 gen 2013, 11:21 GMT-5
Hello,
please following your request about modeling the sound absorption coefficient of materials, have you resolved it? If yes, I am interested to see the model. I tried to build a Comsol model for that but it does not work.
Many thanks in advance. My email address is : t_rostand2@yahoo.fr

Yours,
Hello, please following your request about modeling the sound absorption coefficient of materials, have you resolved it? If yes, I am interested to see the model. I tried to build a Comsol model for that but it does not work. Many thanks in advance. My email address is : t_rostand2@yahoo.fr Yours,
Stefano Firpi
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Posted: 1 decade ago 10 gen 2013, 12:46 GMT-5
Why building a waveguide on top? You can define a dissipative medium under the Pressure Acoustic Model interface using a Delany-Bazley or Biot model for poroelasticity
Why building a waveguide on top? You can define a dissipative medium under the Pressure Acoustic Model interface using a Delany-Bazley or Biot model for poroelasticity

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