基于声辐射模态有源解耦控制的溢出机理研究

Mechanism of control spillover of active structural acoustic decoupling control based on the theory of radiation modes

基于声辐射模态有源控制,通过作动器位置布置可以使得控制过程解耦,通过对比解耦和非解耦两种控制方式,并对其控制结果进行讨论。发现解耦控制所需控制能量较小并且相对控制稳定,比非解耦控制有明显优势。并且两者在低频段都能取得良好的控制效果,在频率较高时出现不同程度的控制溢出。在解耦控制的基础上,通过分析各阶声辐射模态辐射效率特点,作动器布置对称形式与声辐射模态对称形式的对应关系,揭示了溢出的机理。

Decoupling control can be achieved by arranging the locations of actuators.The control effects of the coupling and decoupling control methods were discussed and compared based on the theories of active structural acoustic control and radiation modes.The decoupling method needs less input control energy and more stable,it has obvious advantages compared with the non-decoupling method.Both of them can achieve well control effect in low frequency range and produce control spillover in high frequency range.The mechanism of control spillover was discussed by analyzing the feature of radiation efficiency of radiation mode and the correspondence between the symmetrical forms of actuator locations and radiation modal shapes.