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Acoustic radiation modes and active structural acoustic control in coupled enclosure

机译：耦合外壳中的声学辐射模式和有源结构声学控制

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摘要

There are two problems in the active structural acoustic control (ASAC) of coupled enclosure. Firstly, the structural mode information is required in order to obtain the acoustic radiation mode (ARM) of coupled enclosure. Secondly, only the radiation efficiency is included in conventional ASAC strategy of coupled enclosure, which has not enough good precision. To overcome these problems, by analogy to ARM theory of free space, the acoustic potential energy is expressed in quadratic form of normal velocity on coupling surface and ARM of coupled enclosure is redefined. So the proposed ARM theory of coupled enclosure is consistent with that of free space and is convenient for application. The control strategy based on the dominant acoustic radiation mode (dARM) is proposed, and corresponding ASAC model of the coupled enclosure is also established. Simulation analysis and experimental research on elastic plate-rectangular coupled enclosure are carried out. Both simulation and experimental results show that better control effect can be obtained by controlling APE contributed by dARM. Therefore, the feasibility and effectiveness of the proposed dARM control strategies are proved.
机译：耦合外壳的主动结构声控制（ASAC）存在两个问题。首先，需要结构模式信息以获得耦合外壳的声学辐射模式（臂）。其次，只有辐射效率包括在耦合外壳的传统ASAC策略中，其具有足够的精度。为了克服这些问题，通过比较自由空间的臂理论，以耦合表面的耦合表面和耦合外壳的臂的正常速度的二次形式表示声学电位能量。因此，所提出的耦合外壳的ARM理论与自由空间的衔接符合，方便应用。提出了基于主声辐射模式（DARM）的控制策略，并且还建立了耦合外壳的相应ASAC模型。弹塑板 - 矩形耦合外壳的仿真分析与实验研究。模拟和实验结果都表明，通过控制DARM贡献的APE可以获得更好的控制效果。因此，证明了拟议的DARM控制策略的可行性和有效性。

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