The effect of three-lobed bearing shapes in floating-ring bearings on the nonlinear oscillations of high-speed rotors

Zhang, Congcong; Wang, Yongliang; Men, Rixiu; He, Hongyan; Chen, Wei

doi:10.1177/1350650119873802

Cited by 7 publications

(4 citation statements)

References 26 publications

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“…Soni and Vakharia [29,30] analyzed the static and dynamic characteristics of FRBs with elliptical two lobes using the finite element method, concluding that both were noticeably superior to circular FRBs. Zhang et al [31,32] also investigated this structure as well as FRBs with three lobes. Nonlinear simulation results demonstrated that the FRB with an elliptical ring and bushing could suppress sub-synchronous vibration, while the three-lobe FRB with a high preload factor could completely suppress it.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Thermo-Hydrodynamic Lubrication of Three-Lobe Semi-Floating Ring Bearing Considering Temperature–Viscosity Effect and Static Pressure Flow

Dong,

Wen,

Zhu

et al. 2024

Lubricants

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High-power diesel engine turbochargers predominantly utilize floating ring bearings as their primary supporting components. To further enhance their load capacity, multi-lobe noncircular bearings have been progressively employed. This study focuses on the investigation of noncircular three-lobe SFRBs (semi-floating ring-bearing structures) in marine turbochargers. Employing the half-step center Finite Difference Method (FDM) and the Newton–Raphson iterative procedure, the impact of operational parameters such as the journal speed, external load, oil supply pressure, and oil supply temperature on the static and dynamic characteristics of the inner oil film is analyzed. Subsequently, the accuracy of the theoretical model is validated through a comparative analysis of simulation results obtained from Dyrobes and Fluent. The findings indicate that as the oil supply pressure and temperature increase, the temperature rise and maximum oil film pressure of the three-lobe SFRBs gradually decrease, while the oil film thickness progressively increases, thereby significantly improving the lubrication state. The load capacity of the three-lobe SFRBs is primarily sustained by the bottom tile, where wall friction is most likely to occur. Additionally, within the actual speed range, the stiffness and damping of the three-lobe SFRBs exhibit noticeable nonlinear characteristics.

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Section: Introductionmentioning

confidence: 99%

Analysis of Thermo-Hydrodynamic Lubrication of Three-Lobe Semi-Floating Ring Bearing Considering Temperature–Viscosity Effect and Static Pressure Flow

Dong,

Wen,

Zhu

et al. 2024

Lubricants

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show abstract

“…Generally, in a lobed bearing system, the bearing geometric center and centers of curvature of lobes do not coincide. 21,22 A study by Sharma and Kushare 23 investigated the effect of various roughness patterns on the performance of two-lobe bearing. It was reported that when the roughness pattern is considered in the longitudinal direction, the two-lobe journal bearing provides enhanced value of stability as compared to roughness patterns in other directions.…”

Section: Introductionmentioning

confidence: 99%

Effect of bearing shell deformation and ER fluid behavior on two-lobed slot-entry hybrid journal bearing

Sahu,

Sharma,

Tomar

2023

Proceedings of the Institution of Mechanical Engineers, Part J:

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The present article deals with the effects of deformable bearing shells on the performance of lobed slot-entry hybrid journal bearing systems. The influence of the deformation coefficient [Formula: see text] has been studied using the thin liner elasticity model, which measures the flexibility of the bearing liner. Recently, smart fluid, that is, electrorheological (ER) fluid has been used in various tribological systems to obtain better performance. Therefore, the influence of ER lubricant on the bearing performance characteristics has also been studied in this work. Bingham model constitutive relation has been used to analyze the non-Newtonian behavior of ER fluid. The performance of fluid film bearings is greatly influenced by the noncircularity of the bearings. Therefore, the behavior of deformable bearing shells in a slot-entry journal bearing for lobed conditions has also been studied in the present study. The results reveal that considering deformation in the bearing shell reduces the value of frictional torque, whereas the value of stiffness coefficients and stability threshold speed increases. However, ER lubricant enhances the value of film thickness, stiffness/damping coefficients, and stability threshold speed margin.

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“…Zhang et al. 8 examined numerically and experimentally the properties of the bearing with a multi-lobe fully floating ring bearing. They concluded that the use of multi-lobe FRBs leads to an important vibration reduction and a moderate increase in friction losses.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear stability analysis and numerical continuation of bifurcations of a rotor supported by floating ring bearings

Amamou

2021

Proceedings of the Institution of Mechanical Engineers, Part C:

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Floating ring bearings have been widely used, over the last decades, in rotors of automotive turbochargers because of their improved damping behavior and their good emergency-operating capabilities. They also offer a cost-effective design and have good assembly properties. Nevertheless, rotors with floating ring bearings show vibration effects of nonlinear nature induced by self-excited oscillations originating from the bearing oil films (oil whirl/whip phenomena) and may exhibit various nonlinear vibration effects which may cause damage to the rotor. In order to investigate these dynamic phenomena, this paper has developed a nonlinear model of a perfectly balanced rigid rotor supported by two identical floating ring bearings with consideration of their vibration behavior mainly governed by fluid dynamics. The dimensionless hydrodynamic forces of floating ring bearings have been derived based on the short bearing theory and the half Sommerfeld solution. Using the numerical continuation approach, different bifurcations are detected when a control parameter, the journal speed, is varied. Depending on the system’s physical parameters, the rotor can show stable or unstable limit cycles which themselves may collapse beyond a certain rotor speed to exhibit a fold bifurcation. Bifurcation analysis is performed to investigate the occurring instabilities and nonlinear phenomena. Such results explain the instabilities characteristics of the floating ring bearing in high-speed applications. It has also been found that the selection of the bearing modulus plays an important role in the characterization of the rotor stability threshold speed and bifurcation sequences. An understanding of the system’s nonlinear behavior serves as the basis for new and rational criteria for the design and the safe operation of rotating machines.

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The effect of three-lobed bearing shapes in floating-ring bearings on the nonlinear oscillations of high-speed rotors

Cited by 7 publications

References 26 publications

Analysis of Thermo-Hydrodynamic Lubrication of Three-Lobe Semi-Floating Ring Bearing Considering Temperature–Viscosity Effect and Static Pressure Flow

Analysis of Thermo-Hydrodynamic Lubrication of Three-Lobe Semi-Floating Ring Bearing Considering Temperature–Viscosity Effect and Static Pressure Flow

Effect of bearing shell deformation and ER fluid behavior on two-lobed slot-entry hybrid journal bearing

Nonlinear stability analysis and numerical continuation of bifurcations of a rotor supported by floating ring bearings

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