Influence of contact interface friction of bolted disk joint on motion stability of rotor-bearing system

2021 ◽  
Author(s):  
Yuqi Li ◽  
Zhong Luo ◽  
Baolong Shi ◽  
Jiaxi Liu
Keyword(s):  
Contact Interface ◽  
Interface Friction ◽  
Motion Stability ◽  
Rotor Bearing ◽  
Bearing System

Study On the Bistable Vibration Behaviour of a Rod Fastened Rotor-Bearing System

2021 ◽  
Author(s):  
Jiaqi Li ◽  
YANG Zhongyu ◽  
REN Qingzhao ◽  
MO Guyun ◽  
ZHONG Wenyuan ◽  
...  
Keyword(s):  
Test Bench ◽  
Dynamic Behaviour ◽  
Lagrange Equation ◽  
Phase Spectrum ◽  
Contact Interface ◽  
Transient Responses ◽  
Rotor Bearing ◽  
Acceleration And Deceleration ◽  
Bearing System ◽  
Eccentric Distance

Abstract Based on the Lagrange equation, the motion equation of a rod fastened rotor-bearing system considering the damping of the contact interface is established. The numerical method is employed for numerical analysis. The bifurcation diagram, time series, frequency waveform, phase spectrum and Poincare map are used to illustrate the nonlinear dynamic behaviour. The transient responses during acceleration and deceleration are calculated to reveal the dynamic behaviour of the system. The numerical results hold that since the oil film is nonlinear, the system presents obvious bistable behaviour and a jumping phenomenon. In addition, a test bench of the rod fastened rotor-bearing system is built. The bistable behaviour and jumping phenomenon are experimentally proven, and the effect of the eccentric distance of the rotor on the bistable behaviour is experimentally explored. The results of this paper can be used for the basic design and fault diagnosis of rod fastened rotors.

Analysis of motion stability of the flexible rotor-bearing system with two unbalanced disks

2008 ◽  
Vol 310 (1-2) ◽  
pp. 381-393 ◽  
Author(s):  
Xie Wenhui ◽  
Tang Yougang ◽  
Chen Yushu
Keyword(s):  
Flexible Rotor ◽  
Motion Stability ◽  
Rotor Bearing ◽  
Bearing System ◽  
Analysis Of Motion

Analysis of faults in rotor-bearing system using three-level full factorial design and response surface methodology

2021 ◽  
pp. 095745652110307
Author(s):  
Hara P Mishra ◽  
Arun Jalan
Keyword(s):  
Response Surface Methodology ◽  
Response Surface ◽  
Fault Analysis ◽  
Vibration Response ◽  
Effect Analysis ◽  
Outer Race ◽  
Surface Plot ◽  
Rotor Bearing ◽  
Full Factorial ◽  
Bearing System

This article presents the experimental and statistical methodology for localized fault analysis in the rotor-bearing system. These defects on outer race, on inner race, and on a combination of ball and outer race are considered. In this study speed, load and defects were considered as the essential process variables to understand their significance and effects on vibration response for the rotor-bearing system. Three factors at three levels were considered for experimentation, and the experiment was designed for L27 based on design of experiments (DOE) methodology. From the experiments, the vibration response results are recorded in terms of root mean square value for the analysis. Response surface methodology (RSM) is used for identifying the interaction effect of varying process parameters upon the response of vibrations by response surface plot. The rotor-bearing test setup is used for experimentation and is analyzed by using DOE. This study establishes the prediction of fault in the rotor-bearing system in combined parametric effect analysis and its influence with DOE and RSM.

Natural frequency analysis of a functionally graded rotor-bearing system with a slant crack subjected to thermal gradients

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Arnab Bose ◽  
Prabhakar Sathujoda ◽  
Giacomo Canale
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Power Law ◽  
Beam Theory ◽  
Functionally Graded ◽  
Thermal Gradients ◽  
Element Analysis ◽  
Rotor Bearing ◽  
Natural Frequency Analysis ◽  
Bearing System

Abstract The present work aims to analyze the natural and whirl frequencies of a slant-cracked functionally graded rotor-bearing system using finite element analysis for the flexural vibrations. The functionally graded shaft is modelled using two nodded beam elements formulated using the Timoshenko beam theory. The flexibility matrix of a slant-cracked functionally graded shaft element has been derived using fracture mechanics concepts, which is further used to develop the stiffness matrix of a cracked element. Material properties are temperature and position-dependent and graded in a radial direction following power-law gradation. A Python code has been developed to carry out the complete finite element analysis to determine the Eigenvalues and Eigenvectors of a slant-cracked rotor subjected to different thermal gradients. The analysis investigates and further reveals significant effect of the power-law index and thermal gradients on the local flexibility coefficients of slant-cracked element and whirl natural frequencies of the cracked functionally graded rotor system.

Stability of periodic motion on the rotor-bearing system with coupling faults of crack and rub-impact

2007 ◽  
Vol 21 (6) ◽  
pp. 860-864 ◽  
Author(s):  
Yue-Gang Luo ◽  
Zhao-Hui Ren ◽  
Hui Ma ◽  
Tao Yu ◽  
Bang-chun Wen
Keyword(s):  
Periodic Motion ◽  
Coupling Faults ◽  
Rotor Bearing ◽  
Bearing System

Numerical and experimental investigation on thermohydrodynamic performance of turbocharger rotor-bearing system

2017 ◽  
Vol 121 ◽  
pp. 27-38 ◽  
Author(s):  
Yajing Li ◽  
Feng Liang ◽  
Yu Zhou ◽  
Shuiting Ding ◽  
Farong Du ◽  
...  
Keyword(s):  
Experimental Investigation ◽  
Rotor Bearing ◽  
Bearing System
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