Physical mechanisms of active control of sound transmission through rib stiffened double-panel structure
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摘要: 深入分析双层加筋结构有源隔声的物理机制有助于控制系统的优化设计。用模态叠加法和声振耦合理论对双层加筋有源隔声结构建模。在辐射加筋板声功率最小的控制条件下,从模态耦合的角度对有源隔声的物理本质进行了详细阐述。分析结果表明,由于双层加筋板中筋的耦合作用影响,系统的声能量传输规律及有源隔声机理与现有的模态分析结论相比均发生改变。结合筋的耦合影响,对空腔声场的模态抑制与重构机理进行修正和补充,清晰解释了双层加筋结构有源隔声的物理本质。Abstract: Deeply analyzing the physical mechanisms of active sound insulation of the rib stiffened double-panel struc- ture can offer helps for optimally designing the system. The theoretical model of such system is established using the combined modal expansion and vibro-acoustic coupling method. Under the condition of minimizing radiated power of the radiating ribbed plate, the physical nature of active sound insulation is interpreted in detail from the point of view of modal couplings. Results obtained demonstrate that the rule of the sound energy transmission and the physical mechanisms for the ribbed plate system are all changed, and affected by the coupling effects of the rib, when compared with the analytical results obtained for the unribbed plate system. Taking into account the coupling effects of the rib, the cavity modal suppression and rearrangement mechanisms obtained in existed investigations are modified and supplemented for ribbed plate case, which gives a clear interpretation for the physical nature involved in the active rib stiffened double-panel structure.
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