封闭空间有源弹性壁振动声辐射的鲁棒H∞控制研究

Robust H∞ Control for Active Structure Acoustic Control System Within Enclosed Space Surrounded by Active Flexible Wall

应用H∞ 控制原理 ,设计了封闭空间有源弹性壁声辐射有源力控制系统 ,折衷考虑了系统对外扰力噪声衰减问题和系统参数摄动的鲁棒问题 ;并对流体声速摄动这一常见情况进行了数值仿真。结果表明 ,系统对参数摄动具有较强的鲁棒性 ,同时能有效抑制外扰 ,与目前较先进的基于自适应滤波的前馈控制系统相比 ,具有不需要参考信号 ,系统相对简单 。

Based on the H∞ control theory, an active structure noise control system for en closed space surrounded by active flexible wall is designed in the paper. The d isturbance attenuation and robustness to parameter variation are considered. A common situation, the situation of sound velocity variation, is simulated. Sim ulation results show the active control system has strong robustness to paramete r variations, and external excitation is suppressed effectively..Compared with the feed-forward control system based on adaptive filter, reference signal in sond field are unnecessary for the H ∞ control system, so this system is more simple.