Calculation methods for the transmission loss of single, double and triple partitions

Abstract Methods of calculating the transmission loss for single and double walls are presented. These methods are developed using a statistical energy analysis (SEA). In principle the methods are based on separate calculations of resonant and non-resonant transmission for frequencies less than the critical frequency, f c , of the panels and calculation of only resonant transmission for frequencies equal to, and greater than, f c . Comparisons between calculated and measured results show good agreement. A calculation method is also presented for the transmission loss of triple panels for frequencies greater than the cut-off frequency for the cavities. For frequencies less than the cut-off frequency for the smallest cavity depth it is shown that, in most cases, the effect of the middle panel is very slight.