Abstract
Regarding the prediction of structure-borne sound in large structures consisting of thick plates, there are some difficulties in applying the conventional SEA based on thin plate bending and in-plane waves. This paper examines the applicability of wave intensity analysis to the prediction of the vibration energy level in an L-shaped structure assembled by thick plates. The bending wave in plates is thus expressed by Mindlin's theory. The new model is introduced to improve the accuracy of wave transmission coefficients for line junctions between thick plates. As a result of comparison of the present method with FEM, reasonable results are obtained for the vibration energy level in the L-shaped structure, within approximately 2dB up to 2kHz.
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