Within the area of structure-borne propagation of noise in building structures it is important to know through which structural elements the noise is primarily propagating. This subject has been analysed mainly using Statistical Energy Analysis (SEA) often combined with experiments. In this paper a numerical case study is performed in order to directly quantify the importance of in-plane motions since this is difficult to do by experiments. It is done by comparing the transmitted energy when allowing in-plane motion in the structure compared to the energy transmitted with bending motion only. Two different methods are applied. These are the Finite Element Method (FEM) and SEA. It is found, that the FEM results give a greater increase in the level of transmitted energy compared to SEA when in-plane wave transmission is allowed.
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