Thermohydrodynamic analysis of micro spherical spiral groove gas bearings under slip flow and surface roughness coupling effect

Feng, Kai; Li, Wenjun; Wu, Shen-Bing; Liu, Wanhui

doi:10.1007/s00542-016-2934-z

Cited by 12 publications

(7 citation statements)

References 42 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The partial derivative method was employed to gain the solution to Equation (21). Two partial derivatives to be solved are firstly defined:…”

Section: Solution Of the Lubrication Equation Considering The Rarefacmentioning

confidence: 99%

“…Wang X et al [19,20] studied the influence of surface waviness on gas bearing and found that the surface waviness in different directions had different effects on the static and dynamic characteristics of the bearing. Feng K [21] studied the performance of micro spherical spiral groove gas bearings with surface roughness considering temperature effects. The results showed that the gas temperature of the bearing increased significantly with increased wall roughness.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Probabilistic Sensitivity Analysis of Wear Property for MEMS Gas Bearing

Zhang

Xie

2019

Applied Sciences

View full text Add to dashboard Cite

In this study, the sensitivity of MEMS gas bearing’ performance to the wear in different axial and circumferential positions is investigated in detail. Rarefaction effect is introduced into the transient and steady lubrication equation, and then the finite element method (FEM) is employed to solve the equations. The stochastic process is adopted to simulate wear distribution and view of probability is proposed to describe the change laws of the static and dynamic performance of the bearing. Then, the static and dynamic characteristics of the bearing in 50 wear conditions are calculated for each case. Furthermore, the standard deviations and correlation coefficients of the bearing performance sample points are analyzed to demonstrate the influence degree of wear in different positions.

show abstract

“…The partial derivative method was employed to gain the solution to Equation (21). Two partial derivatives to be solved are firstly defined:…”

Section: Solution Of the Lubrication Equation Considering The Rarefacmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Probabilistic Sensitivity Analysis of Wear Property for MEMS Gas Bearing

Zhang

Xie

2019

Applied Sciences

View full text Add to dashboard Cite

show abstract

“…Zhang et al (2012aZhang et al ( , 2012bZhang et al ( , 2012cZhang et al ( , 2012d) investigated several slip models commonly used in gas microflow in detail, and carried out research on rarefaction effect and random roughness effect on the heat transfer and flow performance of gas microbearing based on fractal surface (Zhang et al, 2012a, 2012b, 2012c, 2012d), and discussed several factors slip and roughness on bearing load capacity performance (Zhang et al, 2012a(Zhang et al, , 2012b(Zhang et al, , 2012c(Zhang et al, , 2012d. Feng et al (2017) compared the effects of slip/nonslip and smooth/rough wall on the temperature, friction torque and load characteristics for the gas bearing in detail, and obtained the thermal-hydrodynamic lubrication performance of the gas spherical spiral groove bearing under charge of the surface roughness coupling slip-flow.…”

Section: Introductionmentioning

confidence: 99%

Slip flow and thermal characteristics in gas thrust bearings with rough surfaces

Xiong,

Xu,

Chen

2024

ILT

View full text Add to dashboard Cite

Purpose This study aims to investigate the rarefaction effects on flow and thermal performances of an equivalent sand-grain roughness model for aerodynamic thrust bearing. Design/methodology/approach In this study, a model of gas lubrication thrust bearing was established by modifying the wall roughness and considering rarefaction effect. The flow and lubrication characteristics of gas film were discussed based on the equivalent sand roughness model and rarefaction effect. Findings The boundary slip and the surface roughness effect lead to a decrease in gas film pressure and temperature, with a maximum decrease of 39.2% and 8.4%, respectively. The vortex effect present in the gas film is closely linked to the gas film’s pressure. Slip flow decreases the vortex effect, and an increase in roughness results in the development of slip flow. The increase of roughness leads to a decrease for the static and thermal characteristics. Originality/value This work uses the rarefaction effect and the equivalent sand roughness model to investigate the lubrication characteristics of gas thrust bearing. The results help to guide the selection of the surface roughness of rotor and bearing, so as to fully control the rarefaction effect and make use of it.

show abstract

“…Zhang et al 13 considered the effects of temperature change, and consequently, gas rarefaction and gas viscosity changes, solved the equations using the finite difference method and examined the nonlinear dynamic behavior of the micro-bearings. Feng et al 14 analyzed the thermo-hydrodynamic performance of microspherical spiral groove bearing considering the effects of gas rarefaction and surface roughness. Zhang et al 15 extracted the modified first-order Reynolds equation by considering thermal creep, which led to a very high thermal gradient along the axis and examined the behavior of the steady state in micro-bearings.…”

Section: Introductionmentioning

confidence: 99%

Effect of temperature on the nonlinear dynamic behavior of two-lobe non-circular gas-lubricated micro-bearings

Gharanjik

Mohammadi

2021

Proceedings of the Institution of Mechanical Engineers, Part J:

View full text Add to dashboard Cite

In this paper, the molecular gas lubrication model was used to analyze the nonlinear dynamic behavior of two-lobe non-circular gas-lubricated micro-bearings. The effects of temperature rise are taken into account. At high temperatures, in addition to gas rarefaction, its viscosity and friction will also change, and slip across boundaries will occur. The rarefaction of the lubricating gas film caused by the microscale effect at high temperatures was considered. The effects of temperature and rotation speed (with and without rarefaction effect) on the dynamic behavior of the non-circular micro gas bearing were studied. The nonlinear equation governing the gas behavior is discretized using the finite-element method and then solved simultaneously with the dynamic equations of rotor motion using the fourth-order Runge–Kutta method. Center orbit diagrams, phase portraits, Poincare maps, power spectrum, and bifurcation diagrams are used to investigate the dynamic behavior of two-lobe non-circular gas-lubricated micro-bearings. Some results show that with increasing temperature, the rotor behavior changes from T-periodic to quasi-periodic. It was also observed that at high temperatures, with increasing rotational speed, the behavior of the system changes from T-periodic to quasi-periodic, but if the gas is rarefied, this change occurs at a slower speed.

show abstract

Thermohydrodynamic analysis of micro spherical spiral groove gas bearings under slip flow and surface roughness coupling effect

Cited by 12 publications

References 42 publications

Probabilistic Sensitivity Analysis of Wear Property for MEMS Gas Bearing

Probabilistic Sensitivity Analysis of Wear Property for MEMS Gas Bearing

Slip flow and thermal characteristics in gas thrust bearings with rough surfaces

Effect of temperature on the nonlinear dynamic behavior of two-lobe non-circular gas-lubricated micro-bearings

Contact Info

Product

Resources

About