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目的验证压电陶瓷智能传感器和驱动器以及正位反馈控制对柔性结构主动控制的有效性.方法将压电陶瓷片分别作为传感器和作动器使用,并粘贴于铝制悬臂梁的表面,对其振动反应实施实时控制.试验过程分为2个阶段,第1阶段5 s为启振阶段,通过激励压电陶瓷作动器使结构产生振动;第2阶段为控制阶段.利用压电陶瓷传感器得到的反馈信号,通过正位反馈算法计算出控制信号.驱动压电陶瓷作动器对结构的振动响应进行实时控制.结果试验得到了模态振动控制与瞬时脉冲振动控制的振动响应曲线,并分别对有控与无控情况进行对比.结论试验结果证明利用压电陶瓷以及正位反馈控制算法能够有效抑制外界激励下的一阶、二阶模态振动和瞬时脉冲扰动引起的结构振动.
Aim To verify the effectiveness of piezoelectric ceramic smart sensors and actuators and positive feedback control on active control of flexible structures.Methods Piezoelectric ceramics were used as sensors and actuators respectively and pasted on the surface of aluminum cantilever beams, The vibration reaction is controlled in real time.The test process is divided into two stages, the first stage of 5 s for the start-up phase, vibrating the structure by the excitation of the piezoelectric ceramic actuator, the second stage for the control phase obtained by the piezoelectric ceramic sensor The feedback signal is calculated and the control signal is calculated by the positive feedback algorithm.The piezoelectric ceramic actuator is driven to control the vibration response of the structure in real time.Results The vibration response curve of modal vibration control and instantaneous pulse vibration control The comparison between the controlled and the non-controlled conditions.Conclusion The experimental results show that the piezoelectric vibrator and the positive feedback control algorithm can effectively suppress the structural vibration caused by the first-order, the second-order mode vibration and the transient pulse disturbance under external excitation.