scholarly journals Reliability sensitivity estimation of rotor system with oil whip and resonance

2017 ◽  
Vol 9 (6) ◽  
pp. 168781401770280 ◽  
Author(s):  
Changqing Su ◽  
Fanyi Guo ◽  
Qikun Shi ◽  
Yimin Zhang
Keyword(s):  
Rotor System ◽  
Oil Whip ◽  
Sensitivity Estimation ◽  
Reliability Sensitivity

Reliability Sensitivity Analyses for Oil Whip in Rotor-Bearing System

2012 ◽  
Vol 538-541 ◽  
pp. 1967-1970
Author(s):  
Chang Qing Su ◽  
Yi Yu Sun ◽  
Le Xin Li
Keyword(s):  
High Speed ◽  
Sensitivity Analyses ◽  
Analysis Method ◽  
Random Parameters ◽  
Work Condition ◽  
Oil Whip ◽  
Reliability Sensitivity ◽  
Rotor Bearing ◽  
The Common ◽  
Bearing System

Oil whip phenomenon is the common fault in rotor-bearing system. The reason why oil whip happens often has been researched in high-speed rotor-bearing system. But in practice engineering, due to the requirement of work condition, oil whip cannot be avoided all the time in rotor-bearing system. The paper is based on the relation criterion of oil whip happens in rotor-bearing system, the reliability mode and system reliability of oil whip are defined, and the reliability analysis method for avoiding oil whip in rotor-bearing system is carried out. The effect on reliability sensitivity of random parameters is studied. Numerical results are also presented and discussed.

Reliability Analysis for Rotor System with Oil Whip and Resonance Based on Frequency

2012 ◽  
Vol 544 ◽  
pp. 110-114
Author(s):  
Chang Qing Su ◽  
Yi Min Zhang
Keyword(s):  
Failure Probability ◽  
Integration Method ◽  
Random Perturbation ◽  
Rotor System ◽  
Reliability Design ◽  
Rotor Systems ◽  
System A ◽  
Oil Whip ◽  
General Systems ◽  
Engineering Problems

Parameter uncertainty of general systems is inherent in most engineering problems. Based on the regularity of oil whip and resonance for rotor system, the reliability problem of rotor system with oil whip and resonance is studied by applying random perturbation technology and reliability theory considering the correlation of the multi-order natural frequency. The reliability mode and the failure probability of rotor systems are defined. The second-order joint failure probability is obtained by using the numerical integration method. The presented method provided the theoretic basis for the reliability design of the rotor system. A numerical example demonstrated that the proposed method is effective.

Reliability-Based Robust Optimization Design for Rubbing Rotor System

2011 ◽  
Vol 105-107 ◽  
pp. 1100-1104
Author(s):  
Chang Qing Su ◽  
Le Xin Li ◽  
Yi Min Zhang
Keyword(s):  
Robust Design ◽  
Design Theory ◽  
Optimization Design ◽  
Design Method ◽  
Rotor System ◽  
Fourth Moment ◽  
Reliability Sensitivity ◽  
Robust Optimization Design ◽  
Reliability Based Optimization ◽  
First Four Moments

Based on the reliability-based optimization design theory, the reliability sensitivity technique and the robust design method, the reliability-based robust design of rubbing rotor system is extensively discussed and a numerical method for reliability-based robust design is proposed. The reliability sensitivity is added to the reliability-based optimization design model and the reliability-based robust design is described as a multi-objection optimization. On the condition of known first four moments of basic random variables, the respective program can be used to obtain the reliability-based robust design information of rubbing rotor system accurately and quickly using the fourth moment technique. According to the numerical results, the approach proposed is a convenient and practical reliability-based roust design method.

scholarly journals Reliability Sensitivity Analysis of Bearing-Rotor System Based on the Dynamic Coefficient

2011 ◽  
Vol 2-3 ◽  
pp. 1004-1007
Author(s):  
Qun Chao Zhao ◽  
Yi Min Zhang
Keyword(s):  
Sensitivity Analysis ◽  
Hydrodynamic Lubrication ◽  
Dynamic Performance ◽  
Rotor System ◽  
Engineering Practice ◽  
Sliding Bearing ◽  
Overall Design ◽  
Reliability Sensitivity ◽  
Reliability Sensitivity Analysis ◽  
Selection Of

According to components reliability sensitivity theory methods, looking upon the dynamic characteristics of hydrodynamic lubrication sliding bearing as the target for study, doing some reliability sensitivity analysis for the bearing-rotor system instability issues, numerical simulation results are given though analyzing. The outcome of the dynamic performance index is proposed based on the sliding bearing selection method for engineering practice to the selection of the radial journal bearing and provides a theoretical basis for overall design of shafting.

Resonance Reliability Sensitivity Analysis for Torsional Vibration of Gear-Rotor Systems With Random Parameters

2017 ◽  
Author(s):  
Jiwei Qiu ◽  
Jianguo Zhang ◽  
Yupeng Ma
Keyword(s):  
Natural Frequencies ◽  
Limit State ◽  
Rayleigh Quotient ◽  
Rotor System ◽  
Random Parameters ◽  
Rotor Systems ◽  
Stiffness Matrices ◽  
Reliability Sensitivity ◽  
Reliability Sensitivity Analysis ◽  
Mc Simulation

In this presented work, a reliability sensitivity analyzing method was proposed for the resonance failures of gear-rotor systems with multiple random parameters. First, eigenvectors corresponding to the natural frequencies of a gear-rotor system governed by deterministic parameters were deduced. Mass and stiffness matrices were then decomposed into sub-matrices in the form of deterministic matrices multiplied by random parameters. Rayleigh quotient formula was utilized to derive the explicit expressions of natural frequencies of the system. Then, limit state functions of resonant failures of the system under an external load with random excited frequency was constructed based on vibration stability criterion. Reliability sensitivity analyzing method was applied to obtain sensitivities of random parameters on the resonant reliability of the gear-rotor system. Finally, a numerical case was given to illustrate the effectiveness and accuracy of the proposed method by comparing with Monte Carlo (MC) simulation.

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