Active control of sound radiation and transmission into a cavity consisting of multi-flexible plates
Active control of sound radiation and transmission into a cavity consisting of multi-flexible plates
复制标题
主动控制声音辐射和传播到由多个柔性板组成的腔体中
DOI：
10.3397/1.3701027
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发表时间：
2012-01
影响因子：
0.4
通讯作者：
Nan Chen
中科院分区：
文献类型：
--
作者：
Huaifeng Cui;Nan Chen
本文研究了结构-声耦合系统声辐射与声传播的主动控制问题。考虑了两个简支柔性板组成的矩形封闭空间。其中一块板是由点力和入射平面波共同驱动的。用模态叠加法描述了两板耦合系统的特性。分析了该模型与单板块模型的差异。然后从降噪水平、控制力幅值和结构振动水平三个方面考虑，确定了点力作动器有效控制的位置。当一个板上施加一个、两个和三个控制力时，确定了封闭体的控制机制和性能。结果表明，采用多个激励器时，壳体内的声势能、两板的动能以及最优控制力的最大幅值都大大降低。考虑到实际应用的可行性，本文还对局部控制进行了研究，并通过仿真比较了局部控制和全局控制的性能。
This paper presents an investigation into the active control of sound radiation and transmission into a structural-acoustic coupled system. A rectangular enclosure involving two simply supported flexible plates is considered. One of the two plates is driven by the combination of a point force and incident plane wave. The characteristics of the coupled system with two plates are described by a modal superposition method. The differences between our model and one-plate model are analyzed. Then, the locations of point force actuators for effective control are determined by considering three aspects: the noise reduction level, control force amplitude and structural vibration level. The control mechanisms and performances for the enclosure are determined when one, two and three control forces are applied on one of the plates. The results demon¬strate that acoustic potential energy in the enclosure, kinetic energy of the two plates and the maximum amplitude of optimal control force are greatly reduced when multiple actuators are used. Considering the practical feasibility, the local control is also examined, and the performances of the local and global control are compared by simulations.