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采用两种控制目标函数，通过比较控制前后两个弹性板及空腔内声压模态坐标幅值与相角的变化，分析了复杂封闭空间结构声辐射的有源消声机制．结果表明，在一般情况下，空腔内噪声的降低是由两个弹性板的模态重组来实现；当扰动频率为顶板的一个固有频率时，有源消声则由顶板模态幅值抑制和底板模态重组的共同作用来完成．
Two kinds of control objective function are adopted to analyze the active muffler mechanism of acoustic radiation in complicated enclosed space structure by comparing the changes of amplitude and phase angle of the modal coordinates of the two elastic plates before and after the control. The results show that under normal circumstances, the cavity noise reduction is achieved by the modal reconfiguration of two elastic plates. When the disturbance frequency is a natural frequency of the roof, the active noise reduction is suppressed by the roof mode amplitude And floor mode recombination to complete the role.