Sound transmission and mode coupling at junctions of thin plates, part II: Parametric survey

Abstract

In the second part of this discussion of sound transmission at the junction of structural plates results are presented of a parametric survey conducted on the performance of a T-junction of concrete plates of various thickness, density, bending rigidity and loss factor. It is seen that alteration of bending rigidity and density produces greater variation in transmission loss than that of plate thickness or material loss factor. Indeed an increase in loss factor can lead to a detrimental increase in mode coupling between travelling bending waves and in-plane waves at all angles of incidence. In general in-plane vibration suffers less reduction in level at low frequencies at junctions of dissimilar plates than does bending vibration.