The coupled acoustic field of fully elastic plate model is described by the modal analysis method. The acoustic potential energy resonance peaks of the fully elastic plate model are significantly more than that of the one elastic plate model due to the influence of the vibration of multi elastic plates. The acoustic field characteristics of the fully elastic plate model are analyzed when the primary excitation source is applied on the different elastic plates. The results show that the coupled acoustic field of the fully elastic plate model is dominated by the structural mode of the elastic plate with primary excitation, and the acoustic mode of the enclosure, and the structural-acoustic coupling between the plate and the enclosure; the structure modes of the other elastic plates have less effects on the acoustic field in the enclosure except the first ones of them.

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˖The active structural acoustic control of enclosure is investigated based on the distributed cooperative control method of multi-agent system (MAS). The coordination problems between the complexity of overall control architecture and intelligent units are discussed by the method. A rectangular enclosure involving two simply supported flexible plates is considered. The characteristics of the coupled system with the two flexible plates are described by the modal superposition method. The feasibility of applying MAS to structural-acoustic coupled system is analyzed. The noise control problem is decomposed into several layers, and sub-controller agents for local control problems are defined as well as their operating regimes and inner functions. All sub-controller agents are coupled into an integral MAS by supervisor-like and competitive coordination mechanisms. The simulation results indicate that the better control performances are attained. At the same time, the active structural acoustic control system has the advantages of MAS, such as parallelism, scalability and robustness.

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