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利用子系统模态综合方法,结合阻抗-导纳矩阵法,建立了双层板腔结构向自由空间声传输及其在入射板PZT控制、辐射板PZT控制,和腔中次级声源作动等多种控制策略下,系统物理模型的统一的分析模型,导出了系统模态响应及最优次级源强度的统一的阻抗-导纳矩阵表达式。该模型表达式各部分物理意义清晰、明确,便于进行系统耦合理论、有源控制及其机理的分析和数值研究。然后,在此基础上对双层板腔结构声传输有源控制进行了全面深入的数值计算和分析研究,重点探讨了控制方法策略及系统参数对有源控制效果的影响及其对应的控制机理。结果表明:入射板PZT作动辐射声功率最小控制策略是通过入射板、声腔和辐射板三个子系统的模态抑制或重组达到消声的目的,涉及多种复杂控制机理,对入射板、辐射板和声腔模态均有效,但对入射板模态更有效;在低频段声腔(0,0,0)模态在系统耦合响应中起主导作用,因此利用腔中次级声源作动能获得较理想的控制效果,是一种较好的控制策略;由于声腔模态与结构模态间复杂的耦合关系,使得某些频率处腔中声势能一定程度上的降低并不一定导致系统声传输损失的增加,因此,腔中声势能最小控制策略不一定能够获得理想的声传输控制效果。
Based on the subsystem modal synthesis method and the impedance-admittance matrix method, the acoustic emission from the double-layer plate cavity structure to free space and the control of PZT on the incident plate and PZT on the radiating plate are established. And other control strategies, a unified analysis model of the system physical model is derived, and a unified impedance-admittance matrix expression of the system modal response and the optimal secondary source intensity is derived. The physical meaning of each part of the model expression is clear and definite, which facilitates the analysis and numerical study of the system coupling theory, active control and its mechanism. Then, on the basis of this, a comprehensive and in-depth numerical calculation and analysis of acoustic transmission active control of double-layer plate cavity structure are carried out. The influence of control strategy and system parameters on active control and its corresponding control mechanism . The results show that the minimum control strategy of PZT on the incident plate is to achieve the purpose of muffling through the mode suppression or reorganization of the three sub-systems of incident plate, acoustic cavity and radiation plate, involving a variety of complex control mechanisms, Plate and sound cavity modes are all effective, but it is more effective for the incident plate mode. In the low frequency range, the (0,0,0) mode plays a leading role in the system coupling response. Therefore, using the secondary sound source in the cavity as the kinetic energy The ideal control effect is a better control strategy. Due to the complex coupling between the acoustic cavity mode and the structural mode, the reduction of the acoustic potential in the cavity at certain frequencies does not necessarily lead to the system acoustic transmission Therefore, the minimum control strategy of the cavity potential energy may not be able to obtain the ideal acoustic transmission control effect.