中文摘要：

分析和总结了典型密频系统特性及其对控制的影响．针对密频系统的模态不稳定特性及密集模态的低可控度问题，引入一定数量的压电类智能结构作为传感器和作动器，基于独立模态空间设计了针对结构包含密集模态的参数自调整模糊主动振动控制系统．该系统对密频系统的不确定性和溢出干扰项具有鲁棒性，且能充分利用作动器的作动能力，在作动能力有限的前提下，相比于传统控制方法可更为有效地抑制结构振动．最后以典型密频系统在轨工作时受到的两种主要激励模式为例，仿真证实了该方案的正确性和有效性．

英文摘要：

For a space structure with closely spaced modes, the particularities and the corresponding impacts on control design are analyzed in this paper. Considering mode shape instability and low controllability/observability of close modes, and adopting piezoelectric elements as actuators and sensors, a self- adjusting fuzzy active vibration control system based on independent mode space is designed, which is robust to system uncertainties and the spillover disturbance of the structure with close modes. This control scheme can take full advantage of the control energy. When the actuator output is set to a limitation, a much more desirable vibration suppression is achieved by this scheme in comparison with traditional control approaches. Finally, the validity and effectiveness of the novel control scheme are verified on a model structure with close modes.