The influence of asymmetry in centralizing spring of squeeze film damper on stability and bifurcation of rigid rotor response

Heidari, Hamidreza; Ashkooh, Mohammadreza

doi:10.1016/j.aej.2016.08.013

Cited by 14 publications

(3 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The nonconcentric SFD outperformed the concentric one in resisting unbalance when introduced suddenly; however, it could easily produce a non-coordinated response. Based on Floquet's theorem, nonlinear dynamics, and bifurcation theory, Heidari [29] studied the stability and bifurcation problem of the unbalanced response in rigid rotors supported by an SFD with asymmetric concentrated springs. The asymmetrically supported rotor [30] produced undesirable asynchronous vibration.…”

Section: Introductionmentioning

confidence: 99%

Research on Sudden Unbalance Response of Rigid-Elastic-Oil Coupled Ball Bearings

Li,

Cui,

Deng

2024

Lubricants

View full text Add to dashboard Cite

(1) Background: To better understand the dynamic characteristics of a ball bearing with an elastic ring squeeze film damper (ERSFD) under sudden unbalance, a novel dynamic model was established by fully considering the coupling between the ERSFD, bearing outer ring (the journal), rotor, and disc (loading bearing); (2) Methods: An improved secant method was developed to determine the initial eccentricity values of the bearing’s outer ring and the disc. The dynamic response of the outer ring under different speed ratios, damping ratios, and mass ratios was solved using the variable-step Runge–Kutta method; (3) Results: In comparison, a low-speed ratio, high damping ratio, and low mass ratio were more conducive to suppressing the bearing vibration. When the imbalance was suddenly introduced, the displacement amplitude of the eccentricity, transmissibility, amplitude–frequency response, and the radius of the outer ring center locus increased; (4) Conclusions: This work provides a reference for further studying the nonlinear vibration of rolling bearings coupled with an ERSFD.

show abstract

Section: Introductionmentioning

confidence: 99%

Research on Sudden Unbalance Response of Rigid-Elastic-Oil Coupled Ball Bearings

Li,

Cui,

Deng

2024

Lubricants

View full text Add to dashboard Cite

show abstract

“…Hamidreza Heidari and Mohammadreza Ashkooh studied the stability and bifurcation properties of SFD-rotor systems. The results show that the unsymmetrical stiffness of squeeze film dampers in the presence of cavitation promoting the chance of undesirable nonsynchronous vibrations [5]. LIU Yang et al analyzed the damping performance of SFD in rotor system from the theoretical point of view, and the results show that SFD can reduce the vibration amount of rotor at certain speed range, and the damping effect is not good at relatively low speed [6].…”

Section: Introductionmentioning

confidence: 99%

Analysis of the effect of squeeze film damper on the bending-torsional coupling vibration characteristics of dual-rotor system

Zhu¹,

Chen²,

Luo³

et al. 2022

Vib. proced.

View full text Add to dashboard Cite

The study of the vibration reduction characteristics of SFD to the bending-torsional coupled vibration of the dual-rotor system can provide support for the structural design of aero-engines. Based on the overall eccentric disc model, the bending-torsional coupling dynamic equation of the dual-rotor system is established in this paper. The amplitude and nonlinear periodic characteristics of the dual-rotor system are obtained by combining Newmark-β method and Newton-Raphson method. The results show that the vibration reduction effect of SFD on bending-torsional coupling vibration is closely related to the speed. The vibration reduction effect of SFD is weak at the first-order critical speed range and below, and reduces the torsional amplitude by 70 % at the second-order critical speed range and above. SFD kept the bending-torsional coupling vibration of the dual-rotor system stable in a stable 5-period motion state.

show abstract

“…ey proposed the viscosity and density of oil as the functions of volume fraction of the air/oil and modeled two-phase fluid density as a function of bubble diameter that changed according to the nonlinear transient film force. Heidari and Ashkooh [33] investigated the stability and bifurcation characteristic of the rotor-SFD system. As cavitation formed, the increasing stiffness-related asymmetry of the SFD film enhanced the likelihood of instability of the rotor-SFD system.…”

Section: Introductionmentioning

confidence: 99%

Numerical and Experimental Investigation of the Effect of Cavitation on Dual Clearance Squeeze Film Damper

Feng

Luo

Yang

et al. 2021

Shock and Vibration

View full text Add to dashboard Cite

A new dynamic model is developed for the dual clearance squeeze film damper (DCSFD) considering the effect of cavitation in this paper. The relationship between the eccentricities of the inner and outer films is achieved based on the equations of motion. The Reynolds equation and Rayleigh–Plesset equation are employed to describe the kinetic properties of DCSFD and the cavitation effect of film, respectively. Under the assumption of compressible fluid, the pressure distribution of DCSFD is finally obtained by the numerically iterative method. The film pressure distribution in the outer layer (including the positive and negative pressure zones) obtained from the experimental test agrees well with the numerical prediction, which verifies the validity of the proposed numerical model. In Section 5, the effects of oil temperature, inlet pressure, eccentricity, and whirling frequency on the cavitation in the film are investigated systematically and experimentally. The experimental results indicate that cavitation mainly affect the pressure in the negative pressure zone of the inner and outer film of DCSFD, but has little influence on the pressure in the positive pressure zone. The area of cavitation increased with eccentricity; when the inner eccentricity reached 0.1 or above, the area near the injection hole of film also generated a small zone of negative pressure. The numerical model and the experimental results in this paper are valuable for further research and engineering applications of DCSFD.

show abstract

The influence of asymmetry in centralizing spring of squeeze film damper on stability and bifurcation of rigid rotor response

Cited by 14 publications

References 11 publications

Research on Sudden Unbalance Response of Rigid-Elastic-Oil Coupled Ball Bearings

Research on Sudden Unbalance Response of Rigid-Elastic-Oil Coupled Ball Bearings

Analysis of the effect of squeeze film damper on the bending-torsional coupling vibration characteristics of dual-rotor system

Numerical and Experimental Investigation of the Effect of Cavitation on Dual Clearance Squeeze Film Damper

Contact Info

Product

Resources

About