Coupling Parameters of a Beam-Plate System Based on a Wave Approach and Comparison with SEA Parameters

概要

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Statistical Energy Analysis (SEA) is widely used for high frequency analysis. This paper particularly deals with a beam-plate coupled system in the SEA framework. An asymptotic representation for the CLFs of this beam-plate system when the plate is excited is investigated by assuming that a diffuse vibrational field exists on the semi-infinite plate. For this, the corresponding wave transmission coefficient into an infinite beam is derived and its dynamic characteristics are discussed. A comparable representation for the beam-excited case, so-called an equivalent loss factor (ELF), is also discussed based on the wave approach. The energy normalised by the power input is predicted using an SEA model involving these coupling parameters. It shows that such coupling parameters can be used for the particular coupling situation. For comparison, an exact response of the beam-plate coupled system is derived using a Fourier technique, which is not presented in this paper.