Fault simulation of blade-casing rubbing for dual-rotor system of aero-engines

被引：0
|
作者：
Jin Y. [1 ,2 ]
Liu Z. [1 ]
Chen Y. [3 ]
机构：
[1] School of Automation Engineering, University of Electronic Science and Technology of China, Chengdu
[2] School of Mechanical Engineering, Southwest Jiaotong University, Chengdu
[3] Harbin Institute of Technology, School of Astronautics, Harbin
来源：
Hangkong Xuebao/Acta Aeronautica et Astronautica Sinica | 2022年 / 43卷 / 12期
基金：
中国国家自然科学基金;
关键词：
aero-engine; blade-casing rubbing; component mode synthesis (CMS) method; dual rotor-bearing system; finite element method;
D O I：
10.7527/S1000-6893.2021.25072
中图分类号：
学科分类号：
摘要：
Blade-casing rubbing have very important effect on the performance, reliability and safety of the aero-engine. A dynamic model of the dual rotor-bearing system of the aero-engine is established based on the Finite Element Method (FEM) by taking into account blade-casing rubbing, misalignment and nonlinearities of the rolling element bearings. The Component Mode Synthesis (CMS) method is applied to reduce the high-degrees of freedom of the dynamic model, and the nonlinear vibration responses of the reduced order model are analyzed by the numerical method to reveal the features of blade-casing rubbing. The results of simulation and experiment show that the dual rotor-bearing system of the aero-engine is a multi-excitation nonlinear system, which presents complex frequency components for the vibration response, such as the rotation frequencies, multiple frequency components and combined frequencies of the high-pressure rotor and low-pressure rotor. For a wide blade-tip clearance, the blade-casing rubbing may be local rub-impact, where the fault feature frequency is manifested as the pass frequency of the blade and the corresponding doubling frequency, and there are a cluster of side bands on feature frequencies which are modulated by rotating frequencies of the dual rotor. For a small blade-tip clearance, the blade-casing rubbing may be full annular rub-impact, where a strong self-excited vibration is induced by dry friction. The results can provide references to fault diagnosis of blade-casing rubbing and blade-tip clearance design for the dual rotor system of aero-engine. © 2022 AAAS Press of Chinese Society of Aeronautics and Astronautics. All rights reserved.
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