Comparison study of misalignment effect along two perpendicular directions on the stability of rigid rotor-aerostatic journal bearing system

Zhang, Jianbo; Zhao, Han; Zou, Donglin; Ta, Na

doi:10.1177/1350650120922110

Cited by 13 publications

(7 citation statements)

References 23 publications

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“…The gas pressure distribution in the bearing clearance is governed by compressible Reynolds equation. 22…”

Section: Bearing Structure and Performance Calculationmentioning

confidence: 99%

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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“…The gas pressure distribution in the bearing clearance is governed by compressible Reynolds equation. 22…”

Section: Bearing Structure and Performance Calculationmentioning

confidence: 99%

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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“…In this study, the finite difference method is used to calculate the main stiffness of gas bearings. 34,35 Gas film radial stiffness is set as 4×106 N/m, and damping is neglected.…”

Section: Finite Element Model Of Gas Bearing Rotor Systemmentioning

confidence: 99%

Numerical and Experimental Investigation on Axial Rub Impact Dynamic Characteristics of Flexible Rotor Supported by Hybrid Gas Bearings

Long

Han

Zhao

et al. 2021

Journal of Low Frequency Noise, Vibration and Active Control

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Gas bearings are widely used in micro- and small turbomachinery. Because of the pursuit of high efficiency, turbomachinery adopts small clearance of rotor and stator. The gas bearing rotor system easily suffers from rub impact due to the inherently low damping and load capacity of gas film. Axial rub impact may lead to catastrophic failure of gas bearing rotor system. Previous work put emphasis on radial rub, and only a few papers researched on the axial rub impact by simulation method. In this paper, dynamic responses of full annular axial rub are investigated numerically and experimentally. A single span flexible rotor test rig is established to support this research. Dynamic characteristics of full annular axial rub of this gas bearing rotor system are obtained with finite element language-APDL. Dynamic characteristics within full speed range are experimentally researched based on the test rig. The dynamic behaviors are analyzed by means of waterfall diagrams, frequency spectrums, orbit trails, and vibration amplitude waveforms. During speed up, half speed whirl and gas film oscillation occur in radial direction. During speed down, the full annular axial rub between rotor thrust disk and gas bearing occurs. When lightly axial rub impact happens, the vibration patterns in the radial direction change barely, and 0 Hz component appears in the axial direction. When serious full annular axial rub impact happens, 0 Hz component occurs in both radial and axial directions and rotor orbit shows transverse motion in radial direction. These forms of dynamic characteristics can be effectively used to diagnose the full annular axial rub impact.

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“…The friction coefficient, and hence the power loss, is highly influenced by the misalignment angle. Zhang et al 24 explored the impact of shaft misalignment in the axial and circumferential axis on the stability of an aerostatic journal-bearing system. He discovered that the fluid film thickness distribution of journal bearings varies with journal misalignment, resulting in a change in aerostatic journal bearing performance.…”

Section: Introductionmentioning

confidence: 99%

Performance analysis of journal bearing having surface waviness operating under misaligned condition

Bangotra,

Sharma,

Taufique

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part J:

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In this present study, the effect of surface waviness on the performance of journal bearing operating in misaligned conditions has been investigated. The journal’s misaligned conditions in the present analysis are taken about the circumferential, the axial, and both axes. For computing the pressure of lubricant inside the bearing, the finite element method has been applied to solve the Reynolds equation and thus static parameters are obtained. The static parameters, that is, load carrying capacity and coefficient of friction are evaluated at different waviness variables and are compared with misaligned journal bearing without surface waviness. It is observed that misalignment considered in both axes has the most severe effect on static performance parameters as compared to misalignment only in the circumferential or axial axis. With the increase in circumferential waviness number up to n = 5, the load-carrying capacity increases, and the coefficient of friction decreases under high eccentricity ratios. Change in waviness amplitude also impacts the bearing performance. Axial waviness always deteriorates the bearing performance. Combined waviness increases the load carrying capacity and decreases the coefficient of friction when circumferential waviness number n = 5 and axial waviness number m = 2. The highest performance enhancement ratio is attained at an eccentricity ratio of 0.8 with a circumferential waviness number n of 5, axial waviness number m of 2, and dimensionless waviness amplitude [Formula: see text] of 0.075.

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Comparison study of misalignment effect along two perpendicular directions on the stability of rigid rotor-aerostatic journal bearing system

Cited by 13 publications

References 23 publications

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

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

Numerical and Experimental Investigation on Axial Rub Impact Dynamic Characteristics of Flexible Rotor Supported by Hybrid Gas Bearings

Performance analysis of journal bearing having surface waviness operating under misaligned condition

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