Abstract：The basic reciprocity relation for a random component was demonstrated, and the hybrid FE-SEA equation was given too. The hybrid FE-SEA model of cavity-plate-cavity system was built, and the SEA model of the system was built at the same time. The modal density of the sound cavity and the coupling loss factors between sound cavity and plate were calculated, and the radiation efficiencies of the FE plate and SE plate were also computed. The response of the cavity-plate-cavity system was calculated, and the response result of the FE-SEA model was compared with the response result of SEA model. The reasons of the error in SEA and hybrid FE-SEA model were analyzed. The contrast result indicates that the two models have a good consistency in mid-high frequency band. The hybrid FE-SEA model and SEA model of the cavity-rear windshield-cavity were also built. The excitation of the inside cavity was measured, and the response sound pressure levels(SPL) of the hybrid FE-SEA model and SEA model were calculated. The SPLs were compared with experimentation result, the contrast result indicates that the SPLs of the two models have a good consistency in mid-high frequency band, and the SPL of the hybrid FE-SEA model has a good consistency with experimentation too.
2010, Vol. 29 
