In the first part of this paper the prediction models for both structural a
nd leak transmission of doors were presented [1]. In this second part, resu
lts are presented for tested models comprising nine steel passage doors and
nine timber passage doors. The results are presented in a form of two prac
tical case studies. All measurements were made by the two-microphone sound
intensity method. The structural SRI of a door was determined when the door
was properly tape-sealed. The predicted structural R-w was on an average 1
.0 +/- 1.5 dB higher than measured R-w of tape-sealed doors, the range of v
ariation being -1 ... + 3 dB (N = 13). The average difference between the p
redicted and the measured SRI increased gradually with frequency from -3 up
to +12 dB. The best structural solutions were those where two rigid panels
formed a double panel without interpanel connections. The interpanel cavit
y was filled with sound-absorbing material which does not form rigid interp
anel connections. Structures with previous descriptions were found to give
8-10 dB better values of R-w than structures comprising strong interpanel c
onnections with the same mass. Gomperts' model for slit-shaped apertures pr
edicted reasonably well the frequency behaviour of slit transmission when n
o seals were present (open apertures). When the door seams were sealed with
rubber seals, the slits behaved in a more complex way probably because of
the irregular shape of the slit. The total SRI of the door was calculated b
y the area-weighted sum of the predicted structural transmission and the pr
edicted slit transmission. Approximating the slit transmission coefficient
by Gomperts' model and predicting the structural transmission by Sharp's mo
del produced a good overall prediction accuracy for the total SRI of the do
ors throughout the frequency range of interest. (C) 2000 Academic Press.