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，本文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，本文提出的振动位移重构方法对目标位置两阶刚体临界振峰的重构误差均不大于25%。
Abstract
In order to realize the vibration estimation at unsensed positions in the rotor systems, this paper proposed a vibration displacement reconstruction method based on an unknown input observer. Firstly, the dynamics model of the rotor system is established by the finite element method, and the accuracy of the model is verified by modal test. Then, a design method 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 is investigated. Finally, experiments are 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
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Key words
rotor system /
vibration reconstruction /
observer
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参考文献
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