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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.
Use both methods and compare the results.
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