Acoustic-structure coupled analysis of interior noise for heavy commercial vehicle

Simplified FE (finite element) model about heavy commercial vehicle cab and acoustic cavity are built in this paper. They are verified through the modal analysis and modal test. Then a acoustic-structure coupled model is formed. Modal analysis is performed using MSC. Nastran. It is shown from the simulation result that the modes of coupled system reflect both the characteristics of structural and cave model. Meanwhile, excitations received from road test are acted to the acoustic-structure coupled model to make a frequency response analysis. The interior noise of response is correlative to the measured values well, so the established acoustic-structure coupled model can achieve better simulation of interior noise, and it is benefit for the later optimal design of acoustic.