基于声辐射模态的有源解耦控制理论,从声辐射模态的四种对称形式的角度出发,讨论各组压电作动器对声辐射模态(1～8阶)伴随系数的激励特性,分析有源解耦控制的溢出问题.结合四组压电作动器的控制特性,将前八阶声辐射模态辐射的声功率分成四组模态声功率,建立一种新的有源解耦控制模型,使得在中频范围内控制溢出得到有效的抑制.数值仿真结果表明,新的控制模型不仅保持在低频范围内较好的控制效果,同时避免在中频段的控制溢出现象,实现有源解耦控制在0～1 000 Hz频率范围内的预期效果.%Based on the decoupling theories of active structural acoustic control and acoustic radiation modes, the control characteristics of four kinds of symmetric forms of the acoustic radiation modes of piezoelectric actuators was discussed. The excitation characteristics of the adjoint coefficients of the first 8-order acoustic radiation modes were analyzed. The control spillover of the decoupling of the active structural acoustic control based on the theory of radiation modes was analyzed. Combining with the control characteristics of the four groups of the actuators, the sound power radiated from the first eight acoustic radiation modals was divided into four groups of modal acoustic power and a new model for the active control to restrain the control spillover in the middle frequency effectively was presented. The simulation results demonstrate that the new control model can not only maintain the good control effects at the low frequency range, but also can avoid control spillover at the middle frequency range. Finally, the effect of the active control at 0～l 000 Hz frequency range was expected.
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