A hybrid SEA model for predicting the interior noise in a high-speed train was constructed. The SEA parameters for the dominant transmission paths of the noise were estimated experimentally using the approximated power-injection method (APIM). These calculation results on the passenger cabin noise from this model were compared with experimentally measured interior noise in an actual moving train. The comparison showed that the accuracy of the calculation was ±1 dB. In addition, to estimate the change in SEA parameters caused by structural deformation of subsystems, two-dimensional coupled analysis composed of structural finite element analysis (FEA) and acoustical boundary element analysis (BEA) was used. It was consequently found that (i) the developed SEA model can find the dominant paths of propagated sound and vibration in high-speed train cars, and (ii) the change in noise level caused by structural deformation of a subsystem can be estimated.
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