Pneumatic hammer characteristics of the aerostatic thrust bearing with central orifice and pressure-equalizing groove

Wu, Yukun; Li, Changlin; Du, Jianjun; Liu, Tun; Zuo, Xiangyun

doi:10.1007/s11071-022-07935-0

Cited by 5 publications

(3 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In the larger film thickness region, the delay of the bearing force variation resulted in negative bearing damping, which led to pneumatic hammer. Wu, Y. K. revealed the mechanism of the pneumatic hammer by analyzing the molecular kinetic energy and phase difference between the variations of air film thickness and the load capacity of bearing [98]. The results showed that pneumatic hammer vibration tended to occur when the mass and supply gas pressure were greater than a critical value.…”

Section: Pneumatic Hammer Phenomenonmentioning

confidence: 99%

Research Developments of Aerostatic Thrust Bearings: A Review

et al. 2022

View full text Add to dashboard Cite

In aerostatic thrust bearings (ATBs), a high-pressure gas film with a certain bearing capacity and stiffness is formed by passing high-pressure gas between the moving surface and the static surface. Aerostatic bearings have outstanding advantages in the following aspects: high precision, high speed, and long service life, etc. They are widely used in many fields, such as high-speed air spindles, precision machine tools, air-bearing guideways, turbine machinery, and high-speed drills. With the pursuit of higher efficiency and high-precision machining machinery, there is an increasing demand for high-performance ATBs. Much effort has been spent on the study of ATBs, such as improvements in load capacity and stiffness, and the enhancement of stability. Some significant progress has been achieved. In this paper, the research developments of ATBs are summarized from several aspects, such as theoretical models and experimental methods, static performance, dynamic performance, and applications. In addition, insights on the breakthrough and development trends of ATBs are put forward. It is hoped that this paper can provide some guidance for the design and application of ATBs.

show abstract

Section: Pneumatic Hammer Phenomenonmentioning

confidence: 99%

Research Developments of Aerostatic Thrust Bearings: A Review

et al. 2022

View full text Add to dashboard Cite

show abstract

“…17 Wu et al investigated the stability of the circular air bearing using the transient Reynolds equation calculated by finite element method (FEM). 18 Wang et al researched the stability of the circular air bearing based on the empirical mode method. 19 Colombo and Moradi et al studied the dynamic stiffness and damping of the rectangular air bearing based on the numerical lumped model.…”

Section: Introductionmentioning

confidence: 99%

Stability of orifice-compensated air bearing with rectangular shape considering air film thickness

Zhang

2024

Proceedings of the Institution of Mechanical Engineers, Part J:

View full text Add to dashboard Cite

A theoretical model of the orifice-compensated air bearing with rectangular shape is built to study the stability, the stiffness and the air consumption considering the air film thickness. The study shows that, the pocket volume ratio of less than 0.03 is recommended to avoid the pneumatic hammer. The stability is good and the air consumption is small when the bearing has the high stiffness. Strict control of the structural deformation is crucial as it can significantly affect the stability. Increasing the nozzle number can improve the stability and avoid the choked flow. The findings are of great importance for the design of the orifice-compensated air bearing.

show abstract

“…Wu et al analyzed features of pneumatic hammer self-excitation in hydrostatic bearings under different structural parameters and supplied pressures. It was found that because the flow rate and supplied pressure were larger than the corresponding critical values, gas hammer self-excitation tends to happen [36]. Sahtod et al conducted simulations of porous and partially porous hydrostatic thrust bearings to research the effect of disturbance frequency on dynamic characteristics.…”

Section: Introductionmentioning

confidence: 99%

Feasibility Analysis of Adopting the Hydrogen Hydrostatic Thrust Bearing

Qiang,

Liu,

Zhao

et al. 2023

Applied Sciences

View full text Add to dashboard Cite

The hydrogen hydrostatic thrust bearing (HHTB) is a key component of hydrogen liquefaction that impacts turbo-expander characteristics. To analyze the feasibility of using the HHTB in this application, characteristics of HHTBs were calculated using a CFD model. To upgrade the performance of the HHTB, the impacts of bearing structure and operating parameters on static performance were investigated. Dynamic characteristics of the HHTB were studied using the dynamic grid method. It was found that the load capacity of the HHTB is less than that of helium-lubricated bearings but higher than that of air- and methane-lubricated bearings. The turbulent kinetic energy of hydrogen is higher than that of other gases. Load capacity can be enhanced through boosting supplied pressure, expanding the diameter of supply orifices, reducing gas film clearance, increasing the orifices quantity and setting a circumferential groove. A reduction in disturbance amplitude slightly increased the bearing’s dynamic stiffness. The dynamic stability of the HHTB was improved by a small film clearance in response to disturbance.

show abstract

Pneumatic hammer characteristics of the aerostatic thrust bearing with central orifice and pressure-equalizing groove

Cited by 5 publications

References 29 publications

Research Developments of Aerostatic Thrust Bearings: A Review

Research Developments of Aerostatic Thrust Bearings: A Review

Stability of orifice-compensated air bearing with rectangular shape considering air film thickness

Feasibility Analysis of Adopting the Hydrogen Hydrostatic Thrust Bearing

Contact Info

Product

Resources

About