Static and dynamic characteristics of a downsized aerostatic circular thrust bearing with a single feed hole

Ishibashi, Kazuma; Kondo, Akihito; Kawada, Shouhei; Miyatake, Masaaki; Yoshimoto, Shigeka; Stolarski, T.A.

doi:10.1016/j.precisioneng.2019.08.014

Cited by 26 publications

(25 citation statements)

References 10 publications

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“…19,20 Based on the principle of a MDOF motor, a small hole throttle bearing is selected, and its structure is shown in Figure 2. The rotor is in a suspended state when high-pressure gas is introduced from the outside, 21 creating a gap between the stator and the rotor, thereby constitute a gas bearing.…”

Section: Air Floating Mdof Motor Structurementioning

confidence: 99%

Analysis of flow field characteristics of multi-degree-of-freedom motor with air-floatation

Xing

Wang

et al. 2021

Advances in Mechanical Engineering

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In order to combine the working performance of the motor and the specific requirements for accuracy, a model combining gas bearing with multi-degree-of-freedom (MDOF) motor is invoked. The bearing structure is optimized in terms of lubrication characteristics, which makes the motor life and deflection accuracy have been significantly improved. This kind of special bearing mainly provides a certain supporting force for the motor. Its stability directly affects the output performance of the motor. It should be ensured that the bearing can be used as a stable supporting structure. This paper mainly analyzes the flow field characteristics of this kind of motor, and discusses the stability of the motor by changing the gas film thickness and the motor rotor speed. Firstly, the structure and basic parameters of the air bearing motor are introduced, and the role of the bearing in the motor is described. Then, the film flow field is analyzed theoretically and simulated by finite element software. Finally, the experimental platform of gas bearing stability is built to verify the rationality of finite element analysis. The results provide references for the application of gas bearings in MDOF motors, and provide a direction for the development of precision in MDOF motors.

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Section: Air Floating Mdof Motor Structurementioning

confidence: 99%

Analysis of flow field characteristics of multi-degree-of-freedom motor with air-floatation

Xing

Wang

et al. 2021

Advances in Mechanical Engineering

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“…Nowadays, the CFD has become a popular tool to investigate the static [29,30] and dynamic [31] performance, and to optimize the structure [32,33]. Thus, to obtain the gas bearing empirical model, Fluent is employed to simulate the gas bearings, and the threedimensional models of the flow filed are developed.…”

Section: Gas Bearingsmentioning

confidence: 99%

New Start-up Method for a Closed-Cycle Compression System with Gas Bearings and Its Characteristics

Lian

Hong

et al. 2020

Chin. J. Mech. Eng.

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Gas bearings, which have the advantages of low frictional resistance and power loss, high rotational speed and high temperature operation, and long life, are more suitable than are traditional liquid lubricated bearings because of their high precision, high rotational speed, and special condition support. However, the problem of starting a closed-cycle compression system with gas bearings still needs to be solved for practical application. Thus, a new start-up method for a closed-cycle compression system with aerostatic gas bearings is proposed in this paper. Further, this paper presents a numerical simulation and experimental investigation of the method’s feasibility and characteristics during the start-up process when the gas tank’s initial pressure is fixed. The results show that the gas tank volume is approximately directly proportional to the start-up time allowable, and a gas tank volume sufficiently small, which not only ensures the feasibility of start-up, but also affects other components only slightly, can be obtained. A perfect combination of radial and axial loads also can be achieved to make the start-up time allowable as long as possible. R134a is a better choice for the working medium than is air, as the start-up time allowable is longer, which leads to a smaller gas tank. This research proposes a new start-up method for a closed-cycle compression system with aerostatic gas bearings which has sufficient load capacity to support system during the start-up method.

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“…They concluded that aerodynamic pressure effect was more clear at ultra-high speeds and large eccentricities. Ishibashi et al 14 concluded that the static and dynamic performance of small aerostatic bearing obtained by Computational Fluid Dynamics (CFD) method showed a reasonably good match with experiments. Wang et al 15 discussed the influence of journal misalignment on the performance of gas journal bearing by using CFD simulations.…”

Section: Introductionmentioning

confidence: 97%

Numerical analysis on the performance characteristics of a new gas journal bearing by using finite difference method

et al. 2021

Advances in Mechanical Engineering

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This paper proposes a novel gas journal bearing in which orifices are different in diameter and distribute unevenly. Finite Difference Method (FDM) combined with Linear Perturbation Method (LPM) is used to solve the unsteady-state Reynolds equation of the flow field in the bearing clearance. Moreover, four types of bearing structures are used to discuss the effects of orifices different in diameter and uneven distribution on the bearing performance. The results demonstrate that the new bearing has better static and dynamic performances compared with those of traditional bearing in which orifices are equal in diameter and distribute evenly. Moreover, thin gas film thickness, high supply pressure, and large eccentricity ratio are hopeful for improving load capacity of the new bearing. Furthermore, the stability of the novel bearing is improved if eccentricity ratio is 0.25–0.3.

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Static and dynamic characteristics of a downsized aerostatic circular thrust bearing with a single feed hole

Cited by 26 publications

References 10 publications

Analysis of flow field characteristics of multi-degree-of-freedom motor with air-floatation

Analysis of flow field characteristics of multi-degree-of-freedom motor with air-floatation

New Start-up Method for a Closed-Cycle Compression System with Gas Bearings and Its Characteristics

Numerical analysis on the performance characteristics of a new gas journal bearing by using finite difference method

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