A computational investigation on the reducing lateral vibration of rotors with rolling-element bearings passing through critical speeds by means of tuning the stiffness of the system supports

Zapoměl, Jaroslav; Ferfecki, Petr

doi:10.1016/j.mechmachtheory.2010.12.006

Cited by 27 publications

(15 citation statements)

References 16 publications

(23 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…There are several designing methods to change the stiffness of the supports. Zapom l and Ferfecki [21] studied the method of reducing lateral vibration of rotors by tuning the stiffness of rolling-element bearings. Ishida et al [22] proposed a new vibration suppression method by utilizing the discontinuous spring characteristic.…”

Section: Introductionmentioning

confidence: 99%

The Amplitude Reduction of a Flexible Rotor Passing the Critical Speed by Modulating Acceleration and Stiffness Simultaneously

Ding

et al. 2018

MENG

View full text Add to dashboard Cite

Background: When an unbalanced flexible rotor passes through its critical speed, it is very easy to result in great vibration amplitude, even the destruction of rotor and bearings. Therefore, it is significant for high-speed rotating machines to reduce the vibration amplitude of flexible rotor. Various patents have been discussed in this article. Objective: The purpose of this study is to find out the amplitude reduction method and simulate the feasibility of flexible rotor passing through critical speed. Methods: On the basis of the model of single disk rotor system with eccentric mass, a novel method is presented to reduce the vibration amplitude passing through critical speed by modulating the acceleration and stiffness simultaneously. Firstly, the amplitude characteristic of a flexible rotor with different acceleration and supporting stiffness was investigated. Then, the method of changing the stiffness during variable acceleration was carried out by numerical simulation based on Newmark algorithm. Furthermore, the strain energy of rotor and input power were also analyzed by using the method of simultaneous modulation of acceleration and stiffness. Results: The simulation results revealed that the simultaneous modulation of acceleration and stiffness could reduce the vibration amplitude of rotor effectively, which was reduced by 44% and 13%, comparing with the single variable acceleration and the single variation of stiffness, respectively. Moreover, the variation tendency of total energy was similar to that of the rotor amplitude, which could be controlled at a very small level. The input power was mainly dependent on the acceleration, but had very little to do with the stiffness. Conclusion: The method was suitable for the model of single disk rotor system, and it could also be applied to complex rotor systems, which was very useful for the security of high speed rotating machine.

show abstract

Section: Introductionmentioning

confidence: 99%

The Amplitude Reduction of a Flexible Rotor Passing the Critical Speed by Modulating Acceleration and Stiffness Simultaneously

Ding

et al. 2018

MENG

View full text Add to dashboard Cite

show abstract

“…The expected performance of the engine is to generate 5 kN of thrust at 28,150 rpm under international standard atmosphere conditions. The shaft of the rotor-bearing system is supported on a front bearing composed by a deep groove ball bearing with a vibration absorber element [31,32] and a rear squeeze film damper bearing [33,34]. Both bearings were designed to provide the appropriate stiffness and damping characteristics based on the entire rotor-bearing system.…”

Section: Introductionmentioning

confidence: 99%

Influence of the Radial Clearance of a Squeeze Film Damper on the Vibratory Behavior of a Single Spool Gas Turbine Designed for Unmanned Aerial Vehicle Applications

Creci

Balastrero

Domingues

et al. 2017

Shock and Vibration

View full text Add to dashboard Cite

This study presents a numerical investigation using the finite element method on the vibratory behavior of a single spool gas turbine designed for unmanned aerial vehicle applications. The shaft of the rotor-bearing system is supported on a front bearing composed of a deep groove ball bearing with a vibration absorber element and a rear squeeze film damper bearing. Three radial clearances for the squeeze film damper were analyzed to determine the best geometric configuration for the rear bearing, considering the rotordynamic performance of the entire system. Whirl speeds and unbalanced system responses were carefully evaluated to determine the best radial clearance for the squeeze film damper. After defining the best radial clearance, a transient analysis was performed to simulate the transition of the system through resonance, and a spectral map is presented to illustrate the vibratory behavior of the system considering the influence of all related important frequencies. The rotordynamic behavior of the system is predicted, and vibration problems are avoided. Its mechanical drawings were released to manufacturing, and the first prototype is in the experimental test phase, thus indicating that the numerical results presented in this study are consistent.

show abstract

“…Wang M. et al [5] studied the vibration characteristics of fan rotor system with flexible support structures. Zapoměl J. et al [6] reduces the lateral vibration when a rotor-support system through critical speed by adjusting the bearing stiffness. Feng Z. et al [7] analyzed the effective of the support stiffness to the dynamic characteristics of a dualrotor structure.…”

Section: Introductionmentioning

confidence: 99%

Influence of support stiffness on aero-engine coupling vibration quantitative analysis

Qu¹,

Guo²,

Tai³

2017

J. vibroeng.

View full text Add to dashboard Cite

This paper investigates the whole aero-engine coupling vibration, as a rotor tester to be the research object. The rotor tester system is composed of two mountings, stator system, support structures and the rotor system. The modal experiment of the whole tester under the condition of mounting in the test room is carried out. The finite element (FE) model of the rotor tester is built, and the model was modified and validated according to the modal test results. A rotor-stator coupling factor and a section rotor-stator rubbing risk coefficient are proposed, the influence of the support stiffness values on the engine vibration characteristics, such as natural frequencies, modal shapes, rotor-stator coupling degree, and stator-rotor rubbing risk degree at compressor and turbine section is quantitative studied. Results show that the support stiffness contributes to the rigid body modal shapes greatly and to the rotor bending ones slightly. The factor and coefficient defined in this study are both reasonable, and they can reflect the corresponding characteristics exactly. Moreover, the effect of the supports stiffness values on the rotor-stator coupling degree and the rotor-stator rubbing risk degree is nonlinear. The rotor-stator coupling factor and the section stator-rotor rubbing risk coefficient proposed in this study provide a new way to quantitatively research the whole engine coupling vibration.

show abstract

A computational investigation on the reducing lateral vibration of rotors with rolling-element bearings passing through critical speeds by means of tuning the stiffness of the system supports

Cited by 27 publications

References 16 publications

The Amplitude Reduction of a Flexible Rotor Passing the Critical Speed by Modulating Acceleration and Stiffness Simultaneously

The Amplitude Reduction of a Flexible Rotor Passing the Critical Speed by Modulating Acceleration and Stiffness Simultaneously

Influence of the Radial Clearance of a Squeeze Film Damper on the Vibratory Behavior of a Single Spool Gas Turbine Designed for Unmanned Aerial Vehicle Applications

Influence of support stiffness on aero-engine coupling vibration quantitative analysis

Contact Info

Product

Resources

About