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can i calculate the absorption coefficients of absorber composed of micro-perforated olate and porous material with comsol?
Posted 7 mai 2013, 04:27 UTC−4 Acoustics & Vibrations Version 3.5a, Version 4.2 1 Reply
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hi, i am a new to comsol,.
And i want to calculate the absorption coefficients of a absorber composed of micro-perforated plate and porous material. can i calculate the coefficients of micro-perforated plate with MATLAB and then assign the values to that in COMSOL instead of Michelle formula?
looking forward to help from any body.
Thanks a lot .
yonghua
And i want to calculate the absorption coefficients of a absorber composed of micro-perforated plate and porous material. can i calculate the coefficients of micro-perforated plate with MATLAB and then assign the values to that in COMSOL instead of Michelle formula?
looking forward to help from any body.
Thanks a lot .
yonghua
1 Reply Last Post 20 mai 2013, 03:08 UTC−4
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Posted:
1 decade ago
Hi,
You can not use the absorption coefficient as it is dimensionless and gives no phase information and it is frequency dependent. If you can find out the impedance (Kg * m/s) of the material you can use that instead.
I have been working on solutions for room-acoustical problems for some months now and it gives quite good results to use impedance instead of absorption coefficient.
Hope this helps
--
/RVN
You can not use the absorption coefficient as it is dimensionless and gives no phase information and it is frequency dependent. If you can find out the impedance (Kg * m/s) of the material you can use that instead.
I have been working on solutions for room-acoustical problems for some months now and it gives quite good results to use impedance instead of absorption coefficient.
Hope this helps
--
/RVN