Dynamical Stress Reliability and Sensitivity Analysis of Nonlinear Rotor System with Rigid-flexible Structure

2011 ◽  
Vol 47 (02) ◽  
pp. 159
Author(s):  
Yimin ZHANG
Keyword(s):  
Sensitivity Analysis ◽  
Rotor System ◽  
Flexible Structure ◽  
Dynamical Stress ◽  
Nonlinear Rotor System

Response of a Discontinuously Nonlinear Rotor System

1992 ◽  
pp. 182-189 ◽  
Author(s):  
D. Gonsalves ◽  
R. D. Neilson ◽  
A. D. S. Barr
Keyword(s):  
Rotor System ◽  
Nonlinear Rotor System

Unbalance Vibration Characteristics and Sensitivity Analysis of the Dual-Rotor System in Aeroengines

2021 ◽  
Vol 34 (1) ◽  
pp. 04020094
Author(s):  
Pingping Ma ◽  
Jingyu Zhai ◽  
Zihuimin Wang ◽  
Hao Zhang ◽  
Qingkai Han
Keyword(s):  
Sensitivity Analysis ◽  
Vibration Characteristics ◽  
Rotor System

On an Independent Period-1 Motion in a Flexible Rotor System

2019 ◽  
Author(s):  
Yeyin Xu ◽  
Albert C. J. Luo
Keyword(s):  
Numerical Simulations ◽  
Internal Resonance ◽  
Mapping Method ◽  
Rotor System ◽  
Flexible Rotor ◽  
Periodic Motions ◽  
Phase Trajectories ◽  
Stability And Bifurcation ◽  
The Stability ◽  
Nonlinear Rotor System

Abstract This paper investigates stable and unstable period-1 motions in a rotor system through the discrete mapping method. The discrete mapping of a nonlinear rotor system is for stable and unstable period-1 motions. The stability and bifurcation of periodic motions are determined. Numerical simulations of periodic motions are completed and phase trajectories, displacement orbits and velocity plane are illustrated. The period-1 motion near the internal resonance is determined with large vibration in the nonlinear rotor system.

Sensitivity Analysis and Application of Natural Frequency of Torsional Vibration of Rotor System

2008 ◽  
Author(s):  
Qing He ◽  
Dongmei Du
Keyword(s):  
Sensitivity Analysis ◽  
Electric Power ◽  
Natural Frequency ◽  
Torsional Vibration ◽  
Natural Frequencies ◽  
Electric Power System ◽  
Rotor System ◽  
Analysis Method ◽  
Turbine Generator ◽  
Sensitivity Analysis Method

The disturbance of electric power system makes large-scale turbine-generator shafts generate torsional vibration. A available method to restrain the torsional vibration of turbine-generator shafts is that all the natural frequencies of torsional vibration of turbine-generator shafts must keep away from the working frequency and its harmonic frequencies as well as all the frequencies that possibly bring on interaction between turbine-generator and electric power system so that the torsional resonation of shafts may not occur. A dynamic design method for natural frequencies of torsional vibration of rotor system based on sensitivity analysis is presented. The sensitivities of natural frequency of torsional vibration to structure parameters of rotor system are obtained by means of the theory of sensitivity. After calculated the torsional vibration dynamic characteristics of original shafts of a torsional vibration stand that simulates the real shafts of 300MW turbine-generator, the dynamic modification for the torsional vibration natural frequency is carried out by the sensitivity analysis method, which makes the first-five natural frequencies of torsional vibration of the stand is very close to the design object. It is proved that the sensitivity analysis method can be used to the dynamic adjustment and optimal design of real shafts of turbine-generator.

Sensitivity Analysis and Uncertainty Quantification of a Coaxial Rotor System

2019 ◽  
Author(s):  
Phuriwat Anusonti-Inthra ◽  
Ethan Corle ◽  
Brendan Smith ◽  
Zackery Nieto
Keyword(s):  
Sensitivity Analysis ◽  
Uncertainty Quantification ◽  
Rotor System ◽  
Coaxial Rotor

Stability Margin Sensitivity Analysis of a Multi-Rotor System Geared by Spiral Bevel Gear Pairs

2010 ◽  
Vol 97-101 ◽  
pp. 3215-3218
Author(s):  
Ye Sen Fan ◽  
San Min Wang ◽  
Zhen Yang
Keyword(s):  
Sensitivity Analysis ◽  
Optimization Design ◽  
Stability Margin ◽  
Rotor System ◽  
Bevel Gear ◽  
Dynamic Equations ◽  
Spiral Bevel Gear ◽  
Global Dynamic ◽  
Spiral Bevel ◽  
The Stability

To study the stability margin sensitivity to the parameters of the geared rotor system is prerequisite to carry on structure optimization design and vibration control. The global dynamic equations of the geared two rotor system are set up through the coupled matrix of the spiral bevel gear pairs, and the stability margin is obtained by analyzing the global dynamic equations. To enhance the damping of the bearings and to enhance the module and mesh damping of the gear pairs can improve the stability margin of the geared rotor system. The method for the stability margin sensitivity analysis of the geared multi-rotor system is feasible. The conclusions from the numerical example are useful to improve the stability margin of the geared multi-rotor systems.

Vibration Control and Unbalance Estimation of a Nonlinear Rotor System Using Disturbance Observer

2009 ◽  
Vol 131 (3) ◽  
Author(s):  
Tsuyoshi Inoue ◽  
Jun Liu ◽  
Yukio Ishida ◽  
Yusuke Yoshimura
Keyword(s):  
Vibration Control ◽  
Disturbance Observer ◽  
Control Method ◽  
Rotor System ◽  
Control Force ◽  
Rotor Systems ◽  
Parameter Variations ◽  
Speed Range ◽  
Disturbance Term ◽  
Nonlinear Rotor System

In rotating machinery, rotor unbalance causes many resonances at critical speeds corresponding to different modes. In this paper, a vibration control method for rotor systems utilizing disturbance observer is proposed. The nonlinear terms, unbalance, parameter variations, and uncertain terms of a rotor system are lumped into a disturbance term, and this term is canceled by using disturbance observer. As a result, the vibrations are suppressed to small amplitudes all over the rotational speed range. Simultaneously, unbalance of the first mode is estimated from the information of control force of disturbance observer. Moreover, the effects of parameter errors of the control system are also investigated. The validity of the proposed method is verified through numerical simulations and experiments.

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