Modeling and stability characteristics of bump-type gas foil bearing rotor systems considering stick–slip friction

Zhou, Runeng; Gu, Yongpeng; Ren, Gexue; Yu, Suyuan

doi:10.1016/j.ijmecsci.2022.107091

Cited by 29 publications

(11 citation statements)

References 43 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The structural stiffness was measured and was found to increase with the rise in the radial deflection of the bump foil. Zhou et al [107] obtained the hysteresis force-displacement curves for the GFB under quasi-static and dynamic loading and unloading. The hysteresis loops were observed to be flat at higher load-perturbation frequencies, indicating a considerable decrease in energy dissipation.…”

Section: Dynamic Shaker and Load-deflectionmentioning

confidence: 99%

A Review on Modeling and Stability Aspects of Gas Foil Bearing Supported Rotors

Khamari¹,

Kumar²,

Behera³

2023

Tribol. Ind.

View full text Add to dashboard Cite

Gas foil bearing rotor (GFBR) systems have received significant interest in the field of rotordynamics and vibration analysis. GFBR systems have a wide range of high-speed turbomachinery applications. Due to the high speed, these machines are susceptible to rigorous vibration and instability. Gas foil bearings instigate large amplitude of vibrations at startup and shut down and severe subsynchronous motions during high-speed operations. Over the years, numerous work has been done in the field of high-speed rotors supported on gas foil bearings. Significant improvement has been observed in the stability and feasibility of the GFBR systems. However, accurate model predictions of gas foil bearing still remain a challenge for its widespread usage in high-speed turbomachinery. A comprehensive review needs to be done to study the previous work and pave the way for future research. The current review is majorly divided into three sections. Firstly, various models used for the performance prediction of gas foil bearings are compiled. After that, major causes of instability that manifest during the experiments and practice with gas foil bearing supported rotors is illustrated. Lastly, the developmental attempts made to inhibit the instability is summarised. This paper presents an overall picture of the current engineering scenario and future prospects of the GFBR systems.

show abstract

Section: Dynamic Shaker and Load-deflectionmentioning

confidence: 99%

A Review on Modeling and Stability Aspects of Gas Foil Bearing Supported Rotors

Khamari¹,

Kumar²,

Behera³

2023

Tribol. Ind.

View full text Add to dashboard Cite

show abstract

“…S-CO 2 has been explored as a lubricating medium for bearings due to its ability to provide high load bearing and good support stability in harsh environments (Heshmat et al , 2018). Foil bearings have been shown to be stable at high speeds and absorb vortex energy through elastic deformation (Wang et al ., 2023; Zhou et al , 2022). However, they have low load-bearing capacity at low speeds and high friction torque during start-up.…”

Section: Introductionmentioning

confidence: 99%

Structural stiffness and equivalent viscous damping in a supercritical carbon dioxide lubricated hybrid journal bearing under hydrostatic status

Zhu,

Qiu,

Chen

et al. 2023

ILT

View full text Add to dashboard Cite

Purpose The purpose of this paper is to propose a type of hybrid bearing lubricated with supercritical carbon dioxide (S-CO2) and to investigate the stiffness and damping characteristics of the bearing under hydrostatic status. Design/methodology/approach Established a test rig for radial bearings lubricated with S-CO2 and used it to measure the dynamic coefficients by recording the relative and absolute displacements of bearing. Test bearing is mounted on a nonrotating, stiff shaft. Using static loading experiments to obtain structural stiffness. The dynamic coefficient regularities of the test bearing under hydrostatic status were revealed through dynamic loading experiments. Findings Experiment results indicate that test bearing displayed increased stiffness when subjected to high excitation frequencies and low excitation forces, as well as elevated damping when exposed to low excitation frequencies and low excitation forces. Additionally, an increase in either environmental pressure or hydrostatic recess pressure can elevate the dynamic coefficient. The effect of temperature on the dynamic coefficient is more pronounced around the critical temperature of S-CO2. Originality/value Designed a type of hybrid bearing for use in the Brayton cycle that is lubricated with S-CO2 and uses hydrostatic lubrication during start-stop and hydrodynamic lubrication during high-speed operation. The hybrid bearing reduces the wear and friction power consumption of gas bearing. However, few experimental analyses have been conducted by researchers in this field.

show abstract

“…Recently, strong coupling methods are developed by obtaining simultaneous solutions of state variables to improve calculation efficiency. [19][20][21] In Bonello and Pham 20 and Zhou et al, 21 dynamic friction models are developed and incorporated to the fully coupled rotor-bearing dynamic models.…”

Section: Introductionmentioning

confidence: 99%

Linear stability and nonlinear rotor responses of the gas foil bearing with multiple sliding beams

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part C:

View full text Add to dashboard Cite

This article reports the stability and dynamic characteristics of a passive gas foil bearing (MSGFB) in which multiple sliding beams provide the elastic support and Coulomb damping. The linear and nonlinear dynamic models of rotor-MSGFB system are established, both considering the complex contact constraints inside foil structures. The instability mechanism of rotor-foil bearing system is revealed from the equivalent dynamic stiffness and the critical whirl speed. The half speed whirl and the frequency locked vibrations are both observed in the simulations, indicating the nonlinearities of gas film and foil structure respectively. The results also show that larger rotor preload of MSGFB help suppress the half speed whirl vibrations and assist improving high speed rotor stability especially under the friction effect.

show abstract

Modeling and stability characteristics of bump-type gas foil bearing rotor systems considering stick–slip friction

Cited by 29 publications

References 43 publications

A Review on Modeling and Stability Aspects of Gas Foil Bearing Supported Rotors

A Review on Modeling and Stability Aspects of Gas Foil Bearing Supported Rotors

Structural stiffness and equivalent viscous damping in a supercritical carbon dioxide lubricated hybrid journal bearing under hydrostatic status

Linear stability and nonlinear rotor responses of the gas foil bearing with multiple sliding beams

Contact Info

Product

Resources

About