Active vibration control for piezoelectricity cantilever beam: an adaptive feedforward control method
Active vibration control for piezoelectricity cantilever beam: an adaptive feedforward control method
复制标题
压电悬臂梁主动振动控制：一种自适应前馈控制方法
DOI：
10.1088/1361-665x/a64c6
复制
发表时间：
2017-04-01
影响因子：
4.1
通讯作者：
Hu, Guang-Di
中科院分区：
文献类型：
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作者：
Zhu, Qiao;Yue, Jun-Zhou;Hu, Guang-Di
这项工作的重点是压电悬臂梁的主动振动控制，其中利用自适应前馈控制器（AFC）来抑制未知多个频率的振动。首先，介绍了实验装置及其数学模型。由于实际中扰动与振动输出之间的通道是未知的，因此采用等效输入扰动（EID）的概念将等效扰动放入输入通道中。在这种情况下，可以通过将控制输入设置为识别的EID来实现振动控制。然后，对于已知多个频率的EID，引入AFC以完美抑制振动，但对频率敏感。为了在存在随机扰动和未建模的非线性动力学的情况下准确识别 EID 的未知频率，采用时频分析（TFA）方法来精确识别未知频率。因此，针对未知频率下的主动振动控制，提出了一种基于TFA的AFC算法。最后，通过实验给出了四个案例来说明所提出的基于TFA的AFC算法的效率。
This work is focused on the active vibration control of piezoelectric cantilever beam, where an adaptive feedforward controller (AFC) is utilized to reject the vibration with unknown multiple frequencies. First, the experiment setup and its mathematical model are introduced. Due to that the channel between the disturbance and the vibration output is unknown in practice, a concept of equivalent input disturbance (EID) is employed to put an equivalent disturbance into the input channel. In this situation, the vibration control can be achieved by setting the control input be the identified EID. Then, for the EID with known multiple frequencies, the AFC is introduced to perfectly reject the vibration but is sensitive to the frequencies. In order to accurately identify the unknown frequencies of EID in presence of the random disturbances and un-modeled nonlinear dynamics, the time-frequency-analysis (TFA) method is employed to precisely identify the unknown frequencies. Consequently, a TFA-based AFC algorithm is proposed to the active vibration control with unknown frequencies. Finally, four cases are given to illustrate the efficiency of the proposed TFA-based AFC algorithm by experiment.