Fundamental Research on Hybrid Control of Sound Noise due to Solid Body Vibration for Creating Silent Space

为了营造一个安静的空间，本文采用反馈控制方法对柔性板的混合声传播控制进行了研究。它是在模态分析的基础上，将真实的结构建模为降阶的集中参数模型，然后利用现代控制理论对选定的多模态振动进行控制，使其具有较高的辐射效率。文中介绍了LQ控制的建模过程和设计方法，并对离散模型进行了控制仿真，验证了该方法的有效性.通过对固支板混合声传输控制的研究表明，该建模方法便于利用现代控制理论进行控制系统的设计.由于控制对象（结构）的模态分析既可以通过实验进行，也可以通过数值方法进行，因此本文所述的建模方法是十分实用和易于操作的。仿真和实验结果表明，该方法可以很好地控制板在低频到较高频率范围内的多共振峰，并能很好地抑制相应的模态声透射/辐射。

In order to create a silent space, this paper study on hybrid sound transmission control of a flexible plate by feedback control method. It is specified by modeling the real structure into a reduced order lumped parameter model on the basis of modal analysis, and then using modem control theory to control the vibration of selected multi-modes with high radiation efficiency. The modeling procedure and the LQ control design are described ; control simulation on the discretemodel is carried out to demonstrate the effectiveness of the method.As demonstrated in this paper by a study on hybrid sound transmission control of a clamped plate, the modeling method makes it easy to take advantages of the modem control theory to design the control system. Since the modal analysis of a control object (structure) can be carried out either by experiment or by numeric methods in advance, the modeling method described in this paper is quite practical and easy to manipulate. It has been confirmed by simulation and experiment that the multi-resonance peaks of the plate ranging from low frequency to fairly high frequency can be well controlled by this method, the related modal sound transmission/radiation can also be well suppressed.