scholarly journals Modal Analysis of Asymmetric Rotor System Using Simple Model

2015 ◽  
Vol 3 (1) ◽  
pp. 10-14
Author(s):  
Mayank Tyagi ◽  
M. Chouksey
Keyword(s):  
Simple Model ◽  
Modal Analysis ◽  
Rotor System ◽  
Asymmetric Rotor

Modal analysis of asymmetric rotor system with isotropic stator using modulated coordinates

2005 ◽  
Vol 284 (3-5) ◽  
pp. 651-671 ◽  
Author(s):  
Jeong-Hwan Suh ◽  
Seong-Wook Hong ◽  
Chong-Won Lee
Keyword(s):  
Modal Analysis ◽  
Rotor System ◽  
Asymmetric Rotor

A novel transient balancing technology of the rotor system based on multi modal analysis and feature points selection

2021 ◽  
pp. 116321
Author(s):  
Shibo Zhao ◽  
Xingmin Ren ◽  
Wangqun Deng ◽  
Kuan Lu ◽  
Yongfeng Yang ◽  
...  
Keyword(s):  
Modal Analysis ◽  
Rotor System ◽  
Feature Points

Modal Analysis and Unbalanced Response Analysis of Rotor System

2014 ◽  
Vol 668-669 ◽  
pp. 209-212
Author(s):  
Mei Huang ◽  
Zhao Yang Xing ◽  
Yuan Yuan Zhao ◽  
Jian Nan Tang ◽  
Hao Yuan
Keyword(s):  
Modal Analysis ◽  
Natural Frequency ◽  
Vibration Mode ◽  
Rotor System ◽  
Response Analysis ◽  
Unbalanced Force

In this article, the entity model of the bearing-rotor system is established and meshed in ANSYS. The natural frequency and vibration mode of the rotor system is analyzed in order to avoid the occurrence of resonance. At the same time, the results showed that not only the location of the unbalance incentive of the system should be taken into account, but also consider the size of the unbalanced force.

Finite Element Modeling of Blade-Rotor System in Turbomachinery

2003 ◽  
Author(s):  
Y. N. Al-Nassar
Keyword(s):  
Finite Element ◽  
Finite Element Modeling ◽  
Modal Analysis ◽  
Rotor System ◽  
Disk System ◽  
Blade Vibration ◽  
Element Modeling ◽  
Disk Mode

Modal analysis of Blade-Disk system under the effect of bearing flexibility is investigated. The present study has considered soft to hard bearing flexibility. The main objective here is to read from the modal analysis results the frequencies that are carrying out some information on blade vibration. The modal analysis shows that that there are few frequencies that are changing with the change of bearing flexibility. These are shaft mode only, shaft-blade nature, disk mode only, disk-blade nature, and blade mode only. The shaft-blade modes are the ones of concern here.

Study on the Dynamic Response of an Unbalanced Rotor System Supported by Ball Bearings

2019 ◽  
Author(s):  
Bin Fang ◽  
Jinhua Zhang ◽  
Ke Yan ◽  
Jun Hong
Keyword(s):  
Dynamic Model ◽  
Ball Bearing ◽  
Great Influence ◽  
Rotor System ◽  
Dynamic Responses ◽  
Ball Bearings ◽  
Motion Patterns ◽  
Symmetric Rotor ◽  
Asymmetric Rotor ◽  
Restoring Forces

Abstract This paper proposed a new four-degree-of-freedom dynamic model of the bearing-rotor system based on ball bearing without Raceway Control Hypothesis, and both the inertia forces of balls and the tilting motions of rotor are fully considering in the calculation of restoring forces and moments of ball bearings. Then the dynamic model are solved by the fourth-step Runge-Kutta method, and the dynamic responses of rotor system including the displacement, velocity and center orbits are obtained, and the influences of rotating speeds, eccentricity and symmetry of rotor are studied and analyzed. The results show that both the varying compliance of ball bearing and rotor eccentric force have a great influence on the dynamic responses and motion patterns of bearing-rotor system, and the titling motion of bearing-rotor should be considered in the analysis of asymmetric rotor or the symmetric rotor under some specific conditions.

PARAMETRIC INSTABILITY OF TWO-DISK ROTOR WITH TWO INERTIA ASYMMETRIES

2012 ◽  
Vol 12 (02) ◽  
pp. 251-284 ◽  
Author(s):  
Q. K. HAN ◽  
F. L. CHU
Keyword(s):  
Dynamic Instability ◽  
Parametric Instability ◽  
Rotor System ◽  
Operating Conditions ◽  
Design Parameters ◽  
Rotating Speed ◽  
Expansion Technique ◽  
Single Disk ◽  
Asymmetric Rotor ◽  
The One

Determination of operating conditions of parametric instability is crucial to the design and usage of the inertia asymmetric rotor. Current research mostly focused on the rotor with single inertia asymmetric disk. There are few studies on the multi-disk rotors with multiple inertia asymmetries. In fact, the interaction between the multiple parametric excitations with various phasing and amplitude, which are induced by the multiple unsymmetrical disks, would make the instability behavior of the system differ distinctly from that of the single-disk rotor system. Thus, the parametric instability of the two-disk rotor system with two inertia asymmetries is studied herein. Two important indicators for describing the unstable regions, namely the unstable rotating speed and width of the unstable region, are defined and derived using the parametric instability theory and Taylor expansion technique. For a practical used two-disk unsymmetrical rotor, three design parameters (inertia excitation phasing, relative position of the disk, and inertia ratio) are discussed in detail for their effects on the two indicators. It is shown from the results that the dynamic instability of the two-disk unsymmetrical rotor system indeed has some unique features that differ from that of the one-disk rotor system. The interaction of the two inertia parametric excitations could be utilized to control (or enhance) the unstable regions.

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