带有时滞修正的空间密频结构模糊振动控制

Time Delay Modified Fuzzy Vibration Control for Space Structures with Close Modes

针对密频系统的模态不稳定特性和低可控度给主动振动控制带来的困难,阐明了模糊理论对空间密频结构控制设计及时滞修正的适用性。基于针对密频结构的参数自调整模糊振动控制系统,分析了传感器时滞对振动控制效果的影响,并就此设计了针对密频时滞系统的难以定量化和不确定性的模糊时滞修正策略,在优化振动控制系统性能的同时,大大降低了对控制量的需求。通过对典型空间密频结构在轨受到的两种主要激励模式下的振动控制仿真,证明了理论的正确性和方法的有效性。

For the problems posed by modal instability and low controllability of close modes,the applicability of fuzzy theory for controller design and time delay modification is elucidated.Based on a self-adjusting fuzzy controller,the impact of time delay in sensor on control effect is analyzed and a new fuzzy way,which can deal with the uncertainty of close modes,is proposed to realize time delay modification.With this time delay modification,the vibration suppression performance of the self-adjusting fuzzy controller is improved,and the control efforts can be greatly reduced.Validity and effectiveness of the novel time delay modification are verified,through the active vibration control simulation of a model structure with close modes.