多源不确定条件下智能薄板主动振动抑制

This paper addresses the issues of input uncertainty and acceleration sensor lag caused by piezoelectric elements, a composite observer method is proposed for achieving active vibration suppression in smart thin plate structures. Firstly, an output recursive observer is employed to estimate the delayed vibration source signal. Then, a predictor is designed to compensate for the phase lag introduced by the sensor, resulting in an equivalent vibration estimation. To mitigate the significant compensation input uncertainty caused by irregular signals in the estimation, the estimated value is shaped to produce smoother vibration compensation information. This method takes full consideration of the system characteristics and laws of the platform, offering a systematic design scheme for vibration compensation. Using the Lyapunov method, it is proven that the closed-loop system is uniformly ultimately bounded. Finally, the effectiveness of the composite observer vibration suppression method is verified through simulations and experiments on a vibration platform with a smart thin plate structure.