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I am trying to model a perforated panel in impedance tube.

Posted 15 août 2015, 02:06 UTC−4 Modeling Tools & Definitions 1 Reply

Song Hwa Young
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Hello,

My name is Hwa Young, Song, I'm a Korea student in acoustics (from seoul national university of science and technology)

I am trying to model a perforated panel in impedance tube. (refer to attached file).
But i have the problems with the absorption coefficient(alpha) and reflection coefficient(R).

I have defined the variables in below
p_i : 1[Pa]*exp(-i*acpr.k*x)
p_r : p - p_i
R : p_r / p_i
alpha : 1-abs(R)^2

But my results don't look like as absorption coefficient

I also tried different variables and i still got different results..
Could someone check the correct variables?
and did someone tried something similar and help me?
I hope you will have time to answer and to help me to solve the problem.

Thanks in advance.
1 Reply Last Post 8 juil. 2016, 13:28 UTC−4
COMSOL Moderator

Hello Song Hwa Young

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Ku Bao-Ee
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Posted: 8 years ago 8 juil. 2016, 13:28 UTC−4
Hi~~

I'm the student from National Taiwan University.

My subject is also needed to build impedance tube for acoustic absorption under water condition.

But we have the same problem.

That's our experiment results didn't match the simulation.

So I curious ,after one year later.

Have you solved the problem yet??

Or you're still working on this project.

I deeply hope you can reply this message, if you're willing to do so.

That can help us very much.
Hi~~ I'm the student from National Taiwan University. My subject is also needed to build impedance tube for acoustic absorption under water condition. But we have the same problem. That's our experiment results didn't match the simulation. So I curious ,after one year later. Have you solved the problem yet?? Or you're still working on this project. I deeply hope you can reply this message, if you're willing to do so. That can help us very much.

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