Abstract
The paper published by Bosmans and Nightingale [1] presented a calculation model for predicting structure-borne sound transmission at junctions involving an eccentrically positioned orthotropic beam. Equation (20) of reference [1] suggests that the torsional stiffness of the beam depends on the shear constant Gxy which, according to Figure 7 of the same paper, corresponds to a plane perpendicular to the beam axis. However, the actual shear deformation caused by beam torsion occurs in the (x,z)and (y,z)-planes, and the torsional stiffness T is independent of Gxy. According to Hearmon [2], the torsional stiffness of an orthotropic beam with rectangular cross-section, is given by:
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