| Absorption data conversions |
 Posted: Thu Mar 17, 2016 7:14 pm |
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| andrzejhd |
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| Joined: 21 Jul 2015 |
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| Location: Szczecinek/Birmingham |
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| Hi again everyone! In my latest model, I need to simulate large audience area consisting of upholster seating. I found the right material in the EASE database, but it's american and all the coefficients are in sabins/sq ft. Any idea how do I convert it into metric? Or is it somehow done automatically by the program?
Thanks for help,
A.  |
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| Posted: Mon Mar 21, 2016 11:26 am |
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| Waldemar |
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| Joined: 05 Dec 2005 |
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| Hi,
to obtain the absorption coefficient (alpha) of the material (which is used in the EASE material database) you have to know the total surface (S) of the measured object.
alpha = Sabine / S
If the Sabine-value is in imperial units (sq ft) then the surface S must be in sq ft also.
If there are no different data for the used octaves, use the same value for all octaves. |
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Best Regards
SDA, Waldemar Richert |
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| Posted: Mon Mar 21, 2016 11:46 am |
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| andrzejhd |
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| Joined: 21 Jul 2015 |
| Posts: 18 |
| Location: Szczecinek/Birmingham |
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| My question was rather how to reverse-engineer the absorption coefficients from imperial to metric. Is it even possible?
I don't get what you mean here:
"If there are no different data for the used octaves, use the same value for all octaves."
EASE database coefficients are usually 1/3 octave values ^^
Have a great day,
A. |
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| Posted: Mon Mar 21, 2016 1:43 pm |
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| thomas |
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| | Quote: | | I found the right material in the EASE database, but it's american and all the coefficients are in sabins/sq ft. Any idea how do I convert it into metric? |
The absorption value in EASE is the absorption coefficient (alfa) - no dimension - no conversion. You can use all the materials in the EASE-database without any conversion.
Kind regards
Thomas |
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| Posted: Mon Mar 21, 2016 2:10 pm |
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| andrzejhd |
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| Joined: 21 Jul 2015 |
| Posts: 18 |
| Location: Szczecinek/Birmingham |
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| Thank you Thomas... That's what I thought from the very beginning! Now I understand my mistake - as you correctly pointed out - alfa is unit-less.
Thanks again,
A. |
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| AFMG Network Forum Index -> EASE 4 |
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