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总览 评价 王记增 * , 周又和 ( 兰州大学土木工程与力学学院,兰州 730000; ) 摘要: 基于Daubechies小波理论的二维尺度函数展开,本文给出了抑制压电智能方板结构扰动的一种主动动力控制模型。与作者此前提出的一维梁式板模型不同的是,本文采用了在板
王记增*, 周又和
(
兰州大学土木工程与力学学院,兰州 730000; )
摘要:
基于Daubechies小波理论的二维尺度函数展开,本文给出了抑制压电智能方板结构扰动的一种主动动力控制模型。与作者此前提出的一维梁式板模型不同的是,本文采用了在板的两个方向上以任意比例进行压电片布片的方式,使得可控模态的阶数能够连续变化。同时,由于尺度函数逼近具有自动滤除振动信号或者扰动信号中高频分量的能力,使得这一控制技术在不需要特殊滤波技术的情况下,也可避免由于观测溢出与控制溢出耦合造成的控制不稳定性现象。数值结果表明了本文控制方式的有效性。
关键词:
固体力学;振动控制;压电智能方板结构;小波理论
WANG Jizeng*, ZHOU Youhe
(
School of Civil Engineering and Mechanics, Lanzhou University, Lanzhou 730000; )
Abstract:
In this study, based on two dimensional scaling function expansions in Daubechies wavelet theory, we have proposed a dynamic control model on the vibration supression of smart rectangular piezoelectric plates. This model allows piezoelectric sensor and actuator segments to be distributed following an arbitrary number ratio along two axes, corresponding to the complete range of vibration modes, which is different what we have adopted in our previous study on one dimensional cases. Owing to the interesting property on that the scaling function transform can automatically filter out high-order components of the vibration sginals from the measurement and controller, this dynamic control model does not lead to the undesired phenomenon of control instability that is caused by the high frequent spilling-over effect. Numerical examples demonstrates the efficiency of the proposed model.
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