scholarly journals Dynamic Modeling and Simulation of ball bearing faults in aero-engine dual rotor-bearing-stator coupling system

2017 ◽  
Author(s):  
Wei Zhang ◽  
Hao-hao He ◽  
An-bo Ming ◽  
Zheng-wei Yang
Keyword(s):  
Modeling And Simulation ◽  
Dynamic Modeling ◽  
Ball Bearing ◽  
Bearing Faults ◽  
Coupling System ◽  
Aero Engine ◽  
Rotor Bearing

Dynamic modeling and simulation of a flexible-rotor ball bearing system

2021 ◽  
pp. 107754632110343
Author(s):  
Jing Liu ◽  
Changke Tang ◽  
Guang Pan
Keyword(s):  
Modeling And Simulation ◽  
Dynamic Modeling ◽  
Contact Force ◽  
Contact Forces ◽  
Flexible Rotor ◽  
Nonlinear Contact ◽  
Rotor Bearing ◽  
Cubic Polynomial ◽  
Amplitude Characteristics ◽  
Bearing System

This work proposes a comprehensive numerical dynamic model of a flexible-rotor bearing system based on the Hertzian and cubic polynomial nonlinear contact force methods. The model can consider the influences of the nonlinear bearing contact forces and unbalanced force caused by the rotor offset. The displacements and spectrums of the flexible-rotor bearing system from the Hertzian and cubic polynomial nonlinear contact force methods are discussed. The influences of the radial clearance, eccentricity, mass, and deformation of the rotor on the frequency–amplitude characteristics of the flexible-rotor bearing system considering a large speed range are analyzed. The results show that the dynamic and vibration characteristics of the flexible-rotor bearing system from the Hertzian and cubic polynomial nonlinear contact force methods are different. The differences of the frequency–amplitude characteristics between the flexible- and rigid-rotor bearing system are small in a lower speed stage; however, their differences are very large in a higher speed stage. This method can be applied to the nonlinear dynamic modeling and simulation of the flexible-rotor bearing system, which can predict the dynamics and prevent the system failures during the design processing of rotor system.

A New Rotor-Ball Bearing-Stator Coupling Dynamics Model for Whole Aero-Engine Vibration

2009 ◽  
Vol 131 (6) ◽  
Author(s):  
G. Chen
Keyword(s):  
Ball Bearing ◽  
Coupling Effect ◽  
Coupling Model ◽  
Hertzian Contact ◽  
Squeeze Film ◽  
Dynamics Model ◽  
New Model ◽  
Engine Vibration ◽  
Coupling System ◽  
Aero Engine

In this paper, a new rotor-ball bearing-stator coupling system dynamics model is established for simulating the practical whole aero-engine vibration. The main characteristics of the new model are as follows: (1) the coupling effect between rotor, ball bearing, and stator is fully considered; (2) the elastic support and the squeeze film damper are considered; (3) the rotor is considered as an Euler free beam of equal-section model, and its vibration is analyzed through truncating limited modes; (4) nonlinear factors of ball bearing such as the clearance of bearing, nonlinear Hertzian contact force, and the varying compliance vibration are modeled; and (5) rubbing fault between rotor and stator is considered. The Zhai method, which is a new explicit fast numerical integration method, is employed to obtain system’s responses, and the whole aero-engine vibration characteristics are studied. Finally, aero-engine tester including casing is established to carry out rubbing fault experiment, the simulation results from rotor-ball bearing-stator coupling model are compared with the experiment results, and the correctness of the new model is verified to some extent.

Sensitivity Analysis and Experimental Research on Ball Bearing Early Fault Diagnosis Based on Testing Signal From Casing

2014 ◽  
Vol 136 (6) ◽  
Author(s):  
G. Chen ◽  
T. F. Hao ◽  
H. F. Wang ◽  
B. Zhao ◽  
J. Wang ◽  
...  
Keyword(s):  
Sensitivity Analysis ◽  
Fault Diagnosis ◽  
Ball Bearing ◽  
Ball Bearings ◽  
Vibration Signals ◽  
Bearing Faults ◽  
Bearing Fault ◽  
Bearing Fault Diagnosis ◽  
Vibration Attenuation ◽  
Aero Engine

The ball bearings of an aero-engine are key parts that frequently fail, and it is very important to effectively carry out fault diagnosis of the ball bearings. However, in the present research work, the ball bearing faults characteristics are extracted mainly from the bearing house signals, it is well known that usually only the casing signals can be measured in practical aero-engine test, and the ball bearing faults characteristics will greatly weaken after transmitting to the casing from the bearing house, therefore, it is very important to extract the fault characteristics of ball bearings from casing vibration signals for the ball bearing fault diagnosis in the practical aero-engine. In this study, simulation experiments for ball bearing faults are conducted using two rotor experimental rigs with casings. In addition, by means of the impulse response method, the transfer characteristics from the ball bearings to casing measuring points are measured, and a sensitivity analysis is performed. Faults are created on the inner ring, outer ring, and ball of the ball bearings in the two experimental rigs. The ball bearing experiments are carried out, and the fault features are extracted by means of a wavelet envelope analysis. The experimental results indicate that, with high connection stiffness between the bearing house and the casing, there is little vibration attenuation. However, with low connection stiffness, the vibration attenuation is great. After the impulse vibrations caused by the ball bearing faults are transmitted to the casing, the casing vibration is very weak and is often submerged in other signals. However, the ball bearing fault characteristic frequencies can still be effectively extracted from the weak casing vibration signals by using a wavelet envelope analysis. The research results in this study provide an experimental basis for a ball bearing fault diagnosis based on a casing test signal from a practical aero-engine.

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