Rigid Rotor Stability Analysis on Finite Hydrostatic Double-Layer Porous Oil Journal Bearing with Velocity Slip

Kumar, Mandeep; Samanta, Pranab; Murmu, Naresh Chandra

doi:10.1080/10402004.2015.1030054

Cited by 16 publications

(5 citation statements)

References 22 publications

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“…15 Phani et al conducted a transient analysis of the rotor by linearizing the disturbance for the double-layer porous hydrostatic bearing. 16 To sum up, the domestic and foreign literature has focused on the start-stop stage and the sudden change stage of the speed of hydrostatic bearing, while few studies have considered the change rule of oil film performance with time under constant linear speed operating conditions. Based on this, this paper will, based on previous research, [17][18][19] study the tribological behaviour of the lubricating oil film when the large hydrostatic turntable operates at a constant linear speed, and reveal the transient change rule of the oil film performance under the influence of different cutting speed and feed speed parameters by combining theory, simulation and experiment.…”

Section: Forewordmentioning

confidence: 99%

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Effect of cutting and feed speed on lubrication performance of large hydrostatic turntable with constant linear velocity

Yanqin,

Rong,

Jianting

et al. 2024

Lubrication Science

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The oil film lubrication performance of a large hydrostatic turntable operating at the model of constant surface cutting speed is studied. Firstly, the rotary speed equation which is bound by the constant surface cutting speed is established. According to the fluid lubrication theory, the gap flow equation, the oil film temperature rise equation and the double‐rectangular‐cavity oil pad bearing capacity equation are derived. Further, a prediction model of oil film lubrication performance in the operating mode is established. The change rules of temperature, pressure and other performance indexes of the film with time are obtained by numerical simulation. And, the above laws are verified by design experiments. It is found that the cutting speed, feed rate leaves a significant impact on the law of variations of oil film performance with time. According to the conclusions, it will be beneficial to improve the bearing capacity of the hydrostatic turntable and further improve the machining accuracy by using cutting parameters reasonably to control the speed within a certain range.

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Section: Forewordmentioning

confidence: 99%

“…El Butch et al studied the transient load performance of tilting pad journal bearings under misalignment 15 . Phani et al conducted a transient analysis of the rotor by linearizing the disturbance for the double‐layer porous hydrostatic bearing 16 …”

Section: Forewordmentioning

confidence: 99%

Effect of cutting and feed speed on lubrication performance of large hydrostatic turntable with constant linear velocity

Yanqin,

Rong,

Jianting

et al. 2024

Lubrication Science

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show abstract

“…The procedure of similar kind was also mentioned elsewhere. 14 Differential equations in p¯'02, p¯'01, and p¯0 are solved simultaneously with appropriate boundary conditions for steady-state pressures in the film as well as porous regions.…”

Section: Numerical Analysismentioning

confidence: 99%

“…To test the stability of the bearing, the following equations are derived from equations of motion for a rigid rotor supported on two identical bearings (readers are referred to Kumar et al. 14 for more details) M¯ and λ can be calculated by solving equations (16) and (17) simultaneously. M¯ thus realized is the critical mass parameter above which the bearings are unstable, and the corresponding λ is the whirl ratio.…”

Section: Dynamic Coefficients and Stabilitymentioning

confidence: 99%

A comprehensive numerical model for double-layered porous air journal bearing at higher bearing numbers

Kumar

Samanta

et al. 2017

Proceedings of the Institution of Mechanical Engineers, Part J:

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Modeling air/gas lubricated double-layered porous journal bearing requires the solution of compressible Reynolds equation. It is observed that at higher bearing numbers, treatment of Reynolds equation with finite difference method using second-order central difference exhibits instabilities due to convective term dominance. To address such instabilities, Reynolds equation is discretized using finite volume and a third-order interpolation scheme to obtain variable values at grid point centers. Multistage Runge–Kutta method and biconjugate gradient stabilized method are used for solving governing equations at film and porous regions, respectively. Steady state and stability characteristics of finite double-layered porous air journal bearings considering Beavers–Joseph velocity slip at porous-film interface are obtained. Numerically stable results are obtained for bearing numbers up to 150 and feeding parameter values ranging from 0.01 to 10.

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“…Moreover, B. Ertas et al used integral squeeze film damper ISFD to solve the problem of subsynchronous vibration at full load and full speed operation of a 46 MW, 6230 kg, multi-stage, multipurpose turbine [4]. Control the vibration of the bearing-rotor system by adjusting the oil supply pressure to change the stiffness and damping characteristics of the squeeze film damper [5]. Through theoretical and experimental studies, this paper discusses the vibration-damping effect of plain bearings with HSFD.…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation on the vibration reduction of rotating shaft ‎using different groove shapes of tilt bearing‎

Abbood,

Abdulla

2023

Diagnostyka

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Vibration control is very important for high-speed rotors. Oil film damping is considered an effective vibration-damping method, especially for long shafts in gas turbines, ships, and other high-speed rotating equipment. The existing groove in the internal surface of the tilt bearing increases the amount of oil that flows through the bearing; this is more effective in suppressing the vibration of the rotor system carried by the plain bearing. In order to suppress the vibration of the rotor system, which is supported by sliding bearings, a different groove-shaped oil flow (GSOF) is studied and analysed in this paper. A different shape of grooves in bearings was set up and measured to study the vibration-damping effect of the flow oil shape with GSOF. ANSYS software presents significant benefits to engage Fluent for oil flow with Transient structural for vibration measurements. This paper uses these terms to perform the simulation numerically to explore the groove-shaped damper's damping effect under the rotor system. The study identified three enhancements of vibration and settling time. First, the circular groove showed a 35.71% reduction in amplitude and 10% increase in stilling time; the next one is the circular groove which reduced the amplitude by 42.85% and the settling time by 0%. The third modification was the inclined groove which reduced the amplitude by 42.85% and the settling time by 12%. The last one was the triple-inclined groove, which reduced the amplitude and settling time by 57.14% and 20%, respectively.

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Rigid Rotor Stability Analysis on Finite Hydrostatic Double-Layer Porous Oil Journal Bearing with Velocity Slip

Cited by 16 publications

References 22 publications

Effect of cutting and feed speed on lubrication performance of large hydrostatic turntable with constant linear velocity

Effect of cutting and feed speed on lubrication performance of large hydrostatic turntable with constant linear velocity

A comprehensive numerical model for double-layered porous air journal bearing at higher bearing numbers

Numerical investigation on the vibration reduction of rotating shaft ‎using different groove shapes of tilt bearing‎

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