基于未知输入观测器的转子系统振动位移重构方法  

A vibration displacement reconstruction method for rotor systems based on an unknown input observer

作　　者：李翁衡 祝长生[1] LI Wengheng;ZHU Changsheng(College of Electrical Engineering,Zhejiang University,Hangzhou 310027,China)

机构地区：[1]浙江大学电气工程学院,杭州310027

出　　处：《振动与冲击》2024年第20期247-254,共8页Journal of Vibration and Shock

基　　金：国家科技重大专项(J2019-Ⅳ-0005-0073);国防科技基础加强计划(2019110C026,2020-ZD-232)。

摘　　要：为了解决发动机转子系统中无传感器位置的振动估计问题,提出了基于未知输入观测器的转子系统振动位移重构方法。首先,用有限元法建立了转子系统的动力学模型,并通过模态试验校核了模型的准确性;然后,提出基于二阶导数构造辅助输出的未知输入观测器设计方法来解决观测器匹配条件不满足的问题,研究了转子系统的状态可观性;最后,在某双悬臂低压单转子系统动力学特性试验装置上进行了试验。试验结果表明,在观测器数学模型包含两阶刚体和前两阶弯曲模态的条件下,该研究的振动位移重构方法对目标位置二阶刚体临界振峰的重构误差均不大于25%。In order to realize the vibration estimation at unsensed positions in rotor systems,a vibration displacement reconstruction method based on an unknown input observer was proposed in this paper.Firstly,the dynamics model of a rotor system was established by the finite element method,and the accuracy of the model was verified by a modal test.Then,a method was designed to solve the problem of unsatisfied observer matching condition by constructing an unknown input observer with auxiliary output based on the second-order derivatives.The state observability of the rotor system was investigated.Finally,experiments were carried out on a lobule-cantilever low-pressure single-rotor system test setup.The experimental results show that under the condition that the mathematical model contains two orders of rigid and the first two orders of bending modes,the reconstruction errors of vibration peaks of the two orders of rigid modes at the target position are all no more than 25%.

关 键 词：转子系统 位移重构 观测器 

分 类 号：TH133.3[机械工程—机械制造及自动化]