Abstract：Based on the coupled finite element and boundary element method, the numerical implementation for computing simultaneously the structural vibration and the associated acoustic field is presented. This paper presents a new approach for integrating discrete structural-acoustic methods with stochastic analysis for computing the vibro-acoustic behavior of the cabin structural subjected to random excitation from a shaker plus reverberant acoustic field. By the mathematical formulation deduced we can calculate nodal response power spectrum density (PSD) of the coupling model under random vibro-acoustic combined environment, it solved the problem that SYSNOISE cannot calculate at the situation when the structure is suffering two different kinds of random excitations simultaneously. The results show that: the effect of structural-acoustic coupling is equivalent to an added damping effect in low frequency, with the increase of frequency, the effect becomes obvious. For the case of vibro-acoustic combined environment, in low frequency, response is mainly caused by random vibration, while in high frequency by reverberant field, modes excited by reverberant field are more than by random vibration, especially in high frequency.
2011, Vol. 30 
