Wave propagation phenomena in beams and rods play an important role in the insulation of structure borne sound. In beams with a sudden change in the cross-section normally part of the wave is reflected and part is transmitted at the discontinuity. In this paper we compute the nonideal reflexion and transmission coefficients by using a combination of the modal 3-dimensional finite element analysis and beam theory. For simplicity we restrict our attention to longitudinal waves.
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