(field measurements)
In order to assess sound performance of a building facade element (wall, window, louver, glazing,...) and its ability to mitigate airborne exterior noise into the reception room , i found different noise descriptors :
*weighted apparent sound reduction index R'w.
*weighted standardized sound level difference Dn, Tw
i want to know when to use each one of them.
am comfused because i think they both have the same sound insulation procedure, which is mentioned in EN ISO 717-1.
Different countries are using different single value descriptors from ISO 717 in their building regulations, classifications and recommendations, etc. So which to use depends on which country and which regulation/classification/recommendation you want to fulfill.
If it is not an issue for you to fulfill a specific regulation, then I would say R'_w is the most common and therefore preferable. See the following paper by B Rasmussen, 'Sound insulation between dwellings – Requirements in building regulations in Europe', Applied Acoustics, Volume 71, Issue 4, April 2010, Pages 373-385: Article Sound insulation between dwellings – Requirements in buildin...
Thanks for sharing mr. Dash.
it's really helpful.
one more question, i need a building acoustic simulation software (preferably a license free one) in order to continue my research.
what do u recommend?
all the softwares i found either are purshased or have a limited demo version.
I am really cornered.
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