Register | Lost password?
Advanced Search
Forum Scope


Forum Options

Minimum search word length is 3 characters - maximum search word length is 84 characters

Please confirm you want to mark all posts read

Mark all topics read

sp_MobileMenu Actions
Not logged in

New/Updated Topics

Select Forum

Help needed with using Absorption Coefficient calculations from ISO354
Posts: 1
February 8, 2021 - 7:25 pm



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

Posts: 559
February 9, 2021 - 5:50 am

Use both methods and compare the results.

Forum Timezone:
Most Users Ever Online: 99
Currently Online:
Guest(s) 1
Currently Browsing this Page:
1 Guest(s)

Devices in use: Phone (1)

Forum Stats:
Groups: 4
Forums: 10
Topics: 549
Posts: 1474
Member Stats:
Guest Posters: 28
Members: 17725
Moderators: 0
Admins: 2