The evaluation of wave transmission in structural junctions is an important
part of the study of structure-borne noise. In this paper, a method for ca
lculating the wave transmission through plate and beam junctions is describ
ed. It is assumed that the joint element is an elastic block. Linear approx
imation of the displacement field is introduced to derive equations which d
escribe the dynamic response of the joint element. A numerical example is p
resented to illustrate the method. The example involves the analysis of vib
ratory power transmission through T-junction of three plates. Wave transmis
sion theory is used to find the complex-wave amplitudes for transmitted and
reflected waves. The complex-wave amplitudes are used to calculate the tra
nsmission efficiencies. This example also includes a comparison of the pres
ented method with other methods for evaluating the wave transmission throug
h junctions. Results of calculations show that the effect of three-dimensio
nal deformation of a junction is important in the mid- and high-frequency r
ange. (C) 1999 Elsevier Science Ltd. All rights reserved.