Features and Identification Indicator Construction of Aero-engine Rubbing Faults

doi:10.3901/JME.2025.22.001

Abstract

Abstract: Blade-casing rubbing is one of the typical faults in aero-engines, but due to the complex structure of the equipment, diagnosing rubbing faults is still a challenge. Taking into account the effects of casing vibration and blade vibration, setting up non-uniform gaps and improves the application method of rubbing force. A model is constructed to study the vibration characteristics of rubbing faults, and the conclusions are verified through an aero-engine fault simulation test rig. The model simulation and experimental results show that rubbing faults will cause a decrease in the amplitude of the rotor vibration rotational frequency and an increase in the amplitude of the casing vibration rotational frequency; In the vibration spectrum of the rotor and casing, the various harmonics of the rotational frequency will be excited to varying degrees in the rubbing fault; Rubbing faults can also significantly excite the blade passage frequency in the vibration of the casing. Based on the conclusions obtained from model simulation and experiments, a fault identification indicator based on the vibration response of the casing is constructed. The numerical results demonstrate that the indicator have anti-interference ability for unbalance faults and can accurately reflect the changes in the degree of rubbing. Finally, the effectiveness of the constructed indicator was verified through the aero-engine test rig data and test flight data. The research results can provide reference for the diagnosis of blade-casing rubbing faults in the aero-engine.

Key words: aero-engine, rubbing fault, rotor, casing, identification indicator

CLC Number:

V231

ZHOU Tao, ZHANG Weiyu, WANG Hao, LIU Bin, HU Minghui, JIANG Zhinong. Features and Identification Indicator Construction of Aero-engine Rubbing Faults[J]. Journal of Mechanical Engineering, 2025, 61(22): 1-16.

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