一种基于模糊自适应的速度反馈主动抑振方法

A Method of Velocity-feedback Active Suppressing Vibration Based on Fuzzy-supervised

为了实现对受到时变气动载荷扰动下悬臂梁式支撑结构振动的有效抑制,建立了基于压电作动器的振动主动控制系统并进行了试验研究。首先,分析了风洞模型振动主动控制的原理,并提出了一种内嵌于支杆内部的压电陶瓷叠堆式作动器的减振器结构;进而,提出了结构振动状态的评价指标,结合模糊逻辑设计了一种自适应变增益速度反馈控制方法;最后,搭建了试验验证平台,对主动控制系统进行了试验,并将提出的模糊自适应控制方法与传统速度反馈的效果进行了对比。试验结果表明,该控制系统与方法具有较高的稳定性与效率,在激励试验中振动速度幅值小于未控制时的18.2%。该系统与控制方法对扰动具有自适应调节能力。

In order to effectively suppress the vibration of a cantilever-like model supporting structure under the influence of time-varying aerodynamic loads,an active vibration control system（AVCS）was established based on piezoelectric actuator,and it was tested.Firstly,the principle of the active vibration control was analyzed,and an absorber structure with piezoelectric ceramic stack actuators embedded in the cantilever-like structure was designed.Secondly,evaluation indices of variation of the vibration were put forward,and an adaptive velocity-feedback controller was proposed whose gain was supervised according to the aforementioned evaluation indices by fuzzy logic.Finally,a laboratory verification platform was built,and active control system experiments were carried out,in which,the fuzzy-supervised velocity-feedback controller（FSVFC）was proposed,and was compared with the traditional velocity-feedback controller（VFC）.The experimental results showed that it＇s control system and method had high stability and efficiency.In the excitation experiment,the amplitude of vibration velocity was less that 18.2% of the uncontrolled one.The system and the control method had adaptive adjustment ability to disturbance.