Effect of recess depth on lubrication performance of annular recess hydrostatic thrust bearing by constant rate flow

Shao, Junpeng; Liu, Guang-dong; Yu, Xiaodong; Zhang, Yanqin; Meng, Xiuli; Jiang, Hui

doi:10.1108/ilt-03-2017-0066

Cited by 18 publications

(9 citation statements)

References 10 publications

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“…h is the oil film thickness, but in oil chamber filed, h = h pad + h oil . The X is the tangential direction of the circumference and the Z is the radial direction of thrust bearing which is the main capacity direction [27]. In Figure 2b A-A face, dynamic eddy current will be formed in this area with the change of pressure gradient under the condition of high pressure and high speed.…”

Section: Modelling and Analysis Of The Hydrostatic Bearing Spindlementioning

confidence: 99%

Design of a Hydrostatic Spindle and Its Simulation Analysis with the Application to a High Precision Internal Grinding Machine

et al. 2022

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Hydrostatic thrust bearings are the core part of the hydrostatic spindle, which is widely used in high precision grinding machines. In this paper, the viscosity-temperature (v-t) characteristics of hydrostatic oil are systematically investigated, which is essential for improving the performance of the hydrostatic thrust bearing and the spindle working at high pressure and high rotational speed. Based on the computational fluid dynamics (CFD) simulation developed, the performance variation rules of thrust bearing surface are established while changing the oil supply pressure. It is found that the bearing capacity and temperature are obviously affected by varying viscosity-temperature characteristics, which have significant fluctuation phenomenon at the orifice. Furthermore, the turbulence intensity of the taper hole is found the least factor by analyzing four kinds of commonly used orifice type configurations. Finally, comparing the simulation and experimental results, the v-t model developed is proofed well matching with the experiment. The model can provide a basis for accurate design and analysis of hydrostatic thrust bearings and consequently the effective design and analysis of the hydrostatic spindle for high precision grinding machine.

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Section: Modelling and Analysis Of The Hydrostatic Bearing Spindlementioning

confidence: 99%

Design of a Hydrostatic Spindle and Its Simulation Analysis with the Application to a High Precision Internal Grinding Machine

et al. 2022

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“…The continuity equation of compressible fluid is given by Shao et al (2017): The equation of gas state …”

Section: Governing Equationmentioning

confidence: 99%

Investigating the influences of pressure-equalizing grooves on characteristics of aerostatic bearings based on CFD

Yan

Wang

2019

ILT

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Purpose The purpose of this study is to reveal the influence law of pressure-equalizing grooves on aerostatic bearings and improve the static performance of bearings by optimizing the distribution form of grooves. Design/methodology/approach In view of two kinds of common restrictor distribution forms on the thrust surface, the linear and the rectangular, six kinds of pressure-equalizing groove schemes were proposed – the line-shape, the extended-shape, the S-shape, the oblong-shape, the X-shape and the reticular-shape. Based on the analysis of lubrication theory of the orifice-type aerostatic bearing, the numerical simulations of different bearings were carried out. The pressure distributions and static characteristic curves of different bearings were obtained. Findings The study reveals that the adoption of the pressure-equalizing grooves can substantially improve the load capacity and static stiffness of the bearing and make the bearing maintain a uniform stress, which enhances operating accuracy and life of the bearing. The superior function of the reticular-shape groove is highlighted. Originality/value The research results can effectively guide the optimization design of aerostatic bearings and provide a crucial technical reference for application of ultra-precision aerostatic supporting system.

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“…The pocket geometry and compensating elements play an important role in achieving adequate stiffness in the hydrostatic bearing. Numerical and experimental studies were reported with capillary and orifice (Rowe, 2013), membrane (Gohara et al , 2014), porous land surface (Hanawa et al , 2017), constant-flow valve (CFV) (Shao et al , 2018), displacement compensator (Vladimir et al , 2021), etc., which have been used as compensating elements in the hydrostatic bearings. Hanawa et al (2017), performed numerical and experimental studies to investigate the effect of providing a porous surface on static stiffness of a capillary-compensated thrust bearing.…”

Section: Introductionmentioning

confidence: 99%

A comparative performance assessment of hydrostatic thrust bearings operating with electrorheological lubricant

Singh

Kumar

Singh

et al. 2022

ILT

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Purpose An electrorheological (ER) fluid comprises dielectric particles suspended in an insulating viscous medium. ER lubricants are considered smart lubricants. They have been applied in hydraulic valves, power transmission devices and damping systems. The purpose of this study is to investigate the performance of hydrostatic thrust bearing operating with ER lubricant. Design/methodology/approach Reynold’s equation was used to model the flow of the ER lubricant in the bearing. The continuous Bingham model was used to express the viscosity of the ER lubricant as a function of yielding stress, applied electric field and shear strain rate. The Reynolds equation is solved using the finite element method (weighted residual approach) to compute the film pressure as a primary variable and the lubricant flow rate, load-carrying capacity, stiffness and damping parameters as associated performance indices. Findings The effects of the pocket shape, compensating elements and ER lubricant on the bearing performance were investigated. The application of ER lubricant significantly enhanced the load-carrying capacity (48.2%), stiffness (49.8%) and damping (4.95%) of the bearings. Circular and triangular pocket bearings with constant-flow valves have been reported to provide better steady-state and rotor-dynamic performances, respectively. Originality/value This study presents the effect of an ER lubricant on the rotor-dynamic performance of hydrostatic thrust bearings with different pocket shapes.

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Effect of recess depth on lubrication performance of annular recess hydrostatic thrust bearing by constant rate flow

Cited by 18 publications

References 10 publications

Design of a Hydrostatic Spindle and Its Simulation Analysis with the Application to a High Precision Internal Grinding Machine

Design of a Hydrostatic Spindle and Its Simulation Analysis with the Application to a High Precision Internal Grinding Machine

Investigating the influences of pressure-equalizing grooves on characteristics of aerostatic bearings based on CFD

A comparative performance assessment of hydrostatic thrust bearings operating with electrorheological lubricant

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