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Help needed with using Absorption Coefficient calculations from ISO354
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October 11, 2019
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February 8, 2021 - 7:25 pm
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As part of my bachelor´s graduation project, I´m experimenting with a new material to determine it’s accoustics properties following the ISO3382-2 and ISO354 guidelines. But I´d like to get guidance on the resolution of this formula:

m = α/10lg(e)

Where α is appointed as an “attenuation coefficient” value from ISO9613, though im not sure if I should use the values listed on Table 1 on this standard or if I should calculate using the formuale listed. I’m using 1/3 Octave Band frequencies.

My doubt comes mainly because these are called as Decibel per Kilometer attenuation and ISO354 mentiones values are “Reciprocal Meters” and also because if i use the values from ISO9613, i get results below 0 and above 1 which seem to be quite out of the expectation.

Any guidance on this or, moreover, any guidance with interpreting Secion 8 of ISO354 will be highly appreciated.

Warm Regards,

Rod Herrera

Chief Acoustics Engineer
Forum Posts: 604
Member Since:
August 12, 2013
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February 9, 2021 - 5:50 am
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Use both methods and compare the results.

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