摘要:讨论主动隔振中控制器输出饱和及其抑制对振动和声辐射控制的影响。首先给出流固耦合振动的时域建模方法,采用有限元/边界元方法建立流固耦合系统的振动方程,在建模过程中通过修正流体附加质量阵得到较准确的系统模型;然后在时域模型的基础上,给出基于自适应滤波的控制和输出饱和的抑制方法。采用由单自由度隔振模型和嵌于无限大障板的简支加筋板组成的耦合系统进行仿真研究,结果显示了饱和抑制方法能够显著地改善主动隔振与远场声辐射的控制效果。
Abstract: Discussed are the influence of output saturation on active vibration isolation and sound radiation control and the method for saturation alleviation. A time domain model describing the coupled vibration of fluid-structure systems is first established by the FEM/BEM approach, in which the added mass of fluid is modified to ensure the accuracy of the natural characteristics of the coupled system. With the time domain model, an adaptive vibration control strategy with saturation alleviation is constructed. Simulation is conducted with a single-degree-of-freedom model connected to a simply supported stiffened plate, which is rigidly baffled and coupled with water at one side. The results have demonstrated that the scheme for saturation alleviation can substantially improve the performance of active isolation of vibration and reduce the radiated sound from the stiffened plate.