sound reduction index

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sound reduction index, R

British term for sound transmission loss.
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As the results show the application of a thicker-layer material for the same structure does not produce a better value of the airborne sound reduction index [DL.sub.R].
It also has good sound reduction index, fire resistance properties, cost effective and easy to fabricate and install.
flexural rigidity, shear rigidity, weighted sound reduction index, thermal resistance etc.) will form the outputs vector Y, Equation 2.