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采用压电陶瓷作为作动器,对柔性结构的作动器位置进行了优化设计并对其进行了振动主动控制研究。首先分析了压电结构振动主动控制的原理和方法;采用基于作动器的模态影响矩阵对压电片进行了优化布置,使压电片配置在控制效能最优的位置。在存在噪声和干扰的情况下对智能结构进行控制,采用LQG/LTR和H_∞方法对结构进行控制,并对二者的控制效果作了比较。结果显示在加入噪声和干扰后,进行适当的处理,采用LQG/LTR和H_∞方法都能达到很好的控制效果,只是鲁棒性有差别。
Piezoelectric ceramic is used as an actuator to optimize the actuator position of the flexible structure and carry out the active vibration control research. Firstly, the principle and method of active vibration control of piezoelectric structure are analyzed. The piezoelectric film is optimally arranged based on the modal influence matrix of the actuator so that the piezoelectric film is placed in the position with the best control efficiency. In the presence of noise and interference on the intelligent structure control, the use of LQG / LTR and H_∞ method to control the structure, and the two control effects are compared. The results show that after adding noise and interference, proper control can be achieved by adopting LQG / LTR and H_∞ methods, but the robustness is different.