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

为了创造一个安静的空间，本文采用反馈控制法对柔性板的混合传声控制进行了研究。该方法是在模态分析的基础上，将实际结构建模为降阶集总参数模型，然后利用现代控制理论选择具有高辐射效率的多模态进行振动控制。介绍了建模过程和LQ控制设计；通过对离散模型的控制仿真，验证了该方法的有效性。本文通过对夹紧板混合传声控制的研究表明，该建模方法便于利用现代控制理论设计控制系统。由于控制对象（结构）的模态分析既可以通过实验进行，也可以预先通过数值方法进行，因此本文所描述的建模方法非常实用且易于操作。通过仿真和实验证实，该方法可以很好地控制板在低频至相当高频范围内的多共振峰，也可以很好地抑制相关的模态声传输/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.