Study on Dynamic Characteristics of Aerostatic Bearing with Elastic Equalizing Pressure Groove

Zhao, Xiaolong; Hao, Dong; Zhou, Fang; Chen, Deng-di; Zhang, Junan

doi:10.1155/2018/6142386

Cited by 11 publications

(11 citation statements)

References 13 publications

(17 reference statements)

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“…Research studies show that adopting the groove structure can suppress the pressure attenuation far from the throttling hole and slow down the phenomenon of gas redundancy in the gas chamber (Du et al , 2012). Zhao et al (2018) proposed the gas bearing with the deformable elastic pressure-equalizing groove and established the dynamic governing equation of gas-solid coupling, which proved the feasibility and superiority of the structure. But the technology had a high requirement for materials.…”

Section: Introductionmentioning

confidence: 96%

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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Section: Introductionmentioning

confidence: 96%

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

Yan

Wang

2019

ILT

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“…Compared with opening the circumferential PEGs, opening the axial PEGs is more helpful to improve the load capacity, even opening only one or two axial PEGs 12 and the dynamic stiffness increases with the increase of frequency, and the equivalent damping coefficient decreases with the increase of frequency. 13 Belforte et al 14 reported that the load carrying capacity and the stiffness of the aerostatic thrust bearing with groove increases significantly, especially at low gas film thickness, where the air flow only has a slight increase. Maamari et al 15 proposed an orifice based aerostatic bearing with a compliant back plate to improve performance, the reaults show that an increase by a factor of three in stiffness compared to conventional bearing while ensuring a positive damping.…”

Section: Introductionmentioning

confidence: 99%

“…Figure13. Dynamic stiffness under different rotation speed: (a) dynamic stiffness u = 100,000 r/min, (b) dynamic stiffness at u = 150,000 r/min, and (c) dynamic stiffness at u = 200,000 r/min.…”

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confidence: 99%

Analysis of the dynamic characteristics of downsized aerostatic thrust bearings with different pressure equalizing grooves at high or ultra-high speed

Yan

Zhang

2021

Advances in Mechanical Engineering

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This study adopts the DMT(dynamic mesh technology) and UDF(user defined functions) co-simulation method to study the dynamic characteristics of aerostatic thrust bearings with equalizing grooves and compare with the bearing without equalizing groove under high speed or ultra high speed for the first time. The effects of air film thicness, supply pressure, rotation speed, perturbation amplitude, perturbation frequency, and cross section of the groove on performance characteristics of aerostatic thrust bearing are thoroughly investigated. The results show that the dynamic stiffiness and damping coefficient of the bearing with triangular or trapezoidal groove have obvious advantages by comparing with that of the bearing without groove or with rectangular groove for the most range of air film thickness, supply pressure, rotation speed, perturbation amplitude, especially in the case of high frequency, which may be due to the superposition of secondary throttling effect and air compressible effect. While the growth range of dynamic stiffness decreases in the case of high or ultra-high rotation speed, which may be because the Bernoulli effect started to appear. The perturbation amplitude only has little influence on the dynamic characteristic when it is small, but with the increase of perturbation amplitude, the influence becomes more obvious and complex, especially for downsized aerostatic bearing.

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“…In another work, a model was proposed to investigate the effects of orifice diameter, supply pressure, eccentricity ratio, squeeze number, and the step reply of a double-pad bearing and was followed by its comparison with the Passive Dynamic Mesh Method (PDMM) [ 24 ]. The effects of changes in perturbation frequency on the coefficient of damping and dynamic stiffness with EEPG were also investigated [ 25 ]. The mathematical calculation method of partially porous aerostatic thrust bearings was carried out by using the Finite Element method [ 26 ].…”

Section: Introductionmentioning

confidence: 99%

Dynamic Performance of Partially Orifice Porous Aerostatic Thrust Bearing

et al. 2021

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The aerostatic thrust bearing’s performance under vibration brings certain changes in stiffness and stability, especially in the range of 100 to 10,000 Hz, and it is accompanied by significant increase in fluctuations due to the changes in frequency, and the size of the gas film damping. In this research work, an analysis is carried out to evaluate the impact of throttling characteristics of small size orifice on stiffness and stability optimization of aerostatic thrust bearings. There are two types of thrust bearing orifices such as: partial porous multiple orifice and porous thrust bearings and their effects on variations in damping and dynamic stiffness are evaluated. A simulation based analysis is carried out with the help of the perturbation analysis model of an aerostatic thrust bearing simulation by using FLUENT software (CFD). Therefore, two models of aerostatic thrust bearings—one with the porous and other with partial porous orifice are developed—are simulated to evaluate the effects of perturbation frequencies on the damping and dynamic stiffness. The results reveal a decrease in the amplitude of dynamics capacity with an increase in its frequency, as well as a decrease in the damping of partial porous aerostatic thrust bearings with an increase in the number of orifices. It also reveals an increase in the radius of an orifice with an increment of damping of bearing at the same perturbation frequency and, with an increase in orifice height, a corresponding decrease in the damping characteristics of bearings and in the dynamic stiffness and coefficient of damping of bearing film in the frequency range less than 100 Hz.

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Study on Dynamic Characteristics of Aerostatic Bearing with Elastic Equalizing Pressure Groove

Cited by 11 publications

References 13 publications

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

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

Analysis of the dynamic characteristics of downsized aerostatic thrust bearings with different pressure equalizing grooves at high or ultra-high speed

Dynamic Performance of Partially Orifice Porous Aerostatic Thrust Bearing

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