Abstract
It is often required to predict the sound radiated from a vibration through an absorbent layer (trim). Statistical energy analysis may be applied in such a case. The required radiation coupling loss factor is estimated from the radiation efficiency. To get the radiation efficiency for the trimmed panel, that of the panel (into air, without trim) is combined with the transmission loss of the absorbent layer to give a corrected radiation efficiency. Although this procedure is quite straightforward, it may produce poor results. An alternative and more accurate procedure for the estimation of the radiation efficiency is presented. The absorbent layer is fully considered in the calculation, which is done using a wave number integration technique. The results from both methods show remarkable differences.
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