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Engine Vibration Modeling and Analysis of Aero-engine with Rubbing Faults

Author: ZhouHaiLun
Tutor: ChenGuo
School: Nanjing University of Aeronautics and Astronautics
Course: Vehicle Operation Engineering
Keywords: Single rotor Dual rotor Rolling bearings Coupling Dynamics Rubbing turn static Unbalanced Coupling Faults Genetic Algorithms Support Vector Machine Fault Diagnosis
CLC: V231.96
Type: Master's thesis
Year: 2009
Downloads: 148
Quote: 2
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Abstract


Modern aero-engine at the same time to the pursuit of high thrust to weight ratio by reducing the turn static gap greatly exacerbated the the collision friction between the rotor blades and stator casing accident occurred. With the development of the aviation industry, is also increasing the structural integrity and reliability requirements of aviation engines, which requires in-depth understanding of turn static rubbing fault vibration characteristics, exclusion and prevention of rubbing fault theory basis. Based on this, we carried out the following research: (1) for aero-engine rotor system with rotor rubbing fault of single / double rotor - Rolling bearings - stator coupling dynamic model. Model, consider the movement of the casing caused by turn static Rubbing elastic support between the rolling bearing outer ring and bearing and squeeze film damping, fully consider the bearing clearance, non-rolling bearing balls and the raceway linear Hertz contact force and the VC (Varying compliance) generated by changes in the bearing support stiffness and vibration. Dual-rotor model also takes into account the coupling of the high pressure rotor and low pressure rotor vibration. Finally, the use of fourth-order Runge-Kutta method to obtain the system response, and verify the correctness of the model. (2) for a single-rotor system, the use of time-domain waveform diagram, Orbit, spectrogram, Poincaré diagram, bifurcation diagram, discussed the impact of the speed of the system nonlinear. Spectrogram and 3D waterfall plot containing a single rotor rubbing fault system spectrum response, compared the occurrence Rubbing rubbing fault occurs frequency response differences found fault characteristic frequency of single-rotor rubbing fault diagnosis; Finally, the use of aero-engine rotor experiment rubbing fault experiment, and the experimental results were compared with the simulation results, the results achieved in good agreement. (3) in the two-rotor model, not only in the rolling bearing more detailed modeling, and considering the high and low pressure rotor bearing coupling through an intermediary role. Nonlinear response of the law, according to the simulation results of the dual-rotor system, first of all, a different speed than the system with rub-impact stiffness changes. Then, the dual rotor system Rubbing RUBBING frequency response differences, and double rotor rubbing fault diagnosis fault characteristic frequency. Finally, analysis of the impact of the speed of the beat vibration response of the dual-rotor system and the vibration signal strength, and utilize the dual-rotor experimental validation the beat vibration response of the law of the dual-rotor system. (4) Research Support Vector Machine classifier algorithm SVM model parameters were selected automatically using genetic algorithms. And the SVM use of the rotor rubbing fault diagnosis. For single-rotor system, the first rotor - ball bearing - stator dynamics model simulation of a large number of training support vector machine rubbing fault samples, then the use of the trained SVM model experimental samples of rubbing fault diagnosis results reached a high recognition rate.

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CLC: > Aviation, aerospace > Aviation > Aero-engine ( propulsion system ) > Engine theory > Engine structural mechanics > Rotor dynamics
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