柔性结构, 振动主动控制, 作动器故障, 鲁棒控制

Firstly, a state space experimental model of flexible plate vibration system with some malfunction connection piezoelectric actuator pairs were identified by the multivariable identification theory. Based on the identified results, the canonical uncertain block diagonal matrix extraction method of malfunction actuators was designed by means of singular value decomposition of the input matrix and linear fraction transformation.At the same time, the residual modal was expressed by the low band filter, then considered the disturbance suppression and control gain constraint performance of the close-loop system, the virtual uncertainty was introduced to establish the μ-synthesis solution procedure. The test results show that when there is connection malfunction on the piezoelectric actuators, compared to the μ-synthesis control without considering the malfunction, the initial perturbation log attenuation ratio will be increased 3 times, so the performance robustness of the mixed uncertainty model of the flexible plate is solved effectively.

flexible structure, active vibration control, actuator driving force change, robust control