Analysis of orifice compensated externally pressurized gas bearings

Wadhwa, Seema S.; Sinhasan, R.; Singh, Devendra

doi:10.1016/0301-679x(83)90071-3

Cited by 16 publications

(15 citation statements)

References 7 publications

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“…Based on this method, the static and dynamic characteristics of the externally pressurized air bearing under different conditions have been analyzed. 4–7 Su and Lie 8 employed the perturbation method to calculate bearing stiffness and damping coefficients, and then calculated the threshold rotor mass under various operating conditions. It showed that the porous bearing is more stable than the orifice feeding bearing at lower rotation speeds or at higher rotation speeds with lower feeding parameters.…”

Section: Introductionmentioning

confidence: 99%

Effect of angular misalignment on the dynamic characteristics of externally pressurized air journal bearing

Shi

Cao

Chen

2019

Proceedings of the Institution of Mechanical Engineers, Part J:

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This paper studies the effect of angular misalignment on the dynamic characteristics of externally pressurized air journal bearing with four degrees of freedom. The linear perturbation method is applied to the Reynolds equation to obtain the steady-state equation and perturbation equations, and then the finite difference method and an iterative method are used to solve the Reynolds equation. Various eccentricity ratios and rotating speeds are taken into considerations for the comparisons of dynamic stiffness coefficients and damping coefficients of the air journal bearing under different tilt angles. In addition, the influences of perturbation frequency ratio on the dynamic performances of the air journal bearing are also estimated.

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Section: Introductionmentioning

confidence: 99%

Effect of angular misalignment on the dynamic characteristics of externally pressurized air journal bearing

Shi

Cao

Chen

2019

Proceedings of the Institution of Mechanical Engineers, Part J:

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“…Wadhwa et al. 7 used finite element method (FEM) to research the influences of rotation speed and geometry parameters on the dynamic characteristics, which include the damping coefficients, stiffness coefficients, threshold speed, and critical mass of instability. Su and Lie 8 investigated the rotation effects on the aerostatic bearing and porous air bearings.…”

Section: Introductionmentioning

confidence: 99%

Comparison of the characteristics of aerostatic journal bearings considering misalignment under pure-static and hybrid condition

Zhang

Zou

2018

Proceedings of the Institution of Mechanical Engineers, Part J:

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In this paper, the steady-state characteristics, including film pressure, load capacity, stiffness, misalignment moment of aerostatic bearings considering two types of misalignment (along vertical direction [Formula: see text] and along horizontal direction [Formula: see text]) are studied under pure-static and hybrid condition. The journal misalignment effects on the steady-state characteristics under pure-static condition and hybrid condition are studied comparatively. The results show that the load capacity and stiffness increase with the increase in the degree of journal misalignment under hybrid condition, while they decrease with the increase in the degree of journal misalignment under pure-static condition. Moreover, the journal misalignment along two perpendicular direction effects on the performances of aerostatic bearings are also investigated comparatively and the performances of bearing are found to be more sensitive to the misalignment along horizontal direction.

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“…Wadhwa et al. 12 employed the formulation presented by Lund, 10 but they proposed to include the external pressurization in terms of the radial injection flow. Stiffness and damping bearing coefficients were determined using a perturbation method.…”

Section: Introductionmentioning

confidence: 99%

Adjustable hybrid gas bearing – Influence of piezoelectrically adjusted injection on damping factors and natural frequencies of a flexible rotor operating under critical speeds

Pierart

Santos

2016

Proceedings of the Institution of Mechanical Engineers, Part J:

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Damping factors and natural frequencies of a flexible rotor supported by a gas bearing with piezoelectrically adjusted flow, are theoretically determined using a rotor finite element model coupled with the modified Reynolds equation. An extra term is added to the standard formulation of Reynolds equation aiming at incorporating the effect of the adjustable external pressurized inlet flow. Two different configurations are theoretically as well as experimentally studied: (a) the air is injected from a single orifice positioned at the bottom of the bearing and (b) the air is injected through four radial injectors equally pressurized. For the two configurations, the theoretical results are experimentally validated as a function of the piezoactuators input voltage and the journal angular velocity. Results show a good agreement for natural frequencies and damping factors. Theoretical and experimental results show qualitatively as well as quantitatively that the injectors position and the injection flow (dependent on the piezoactuator input voltage) have an important influence on the dynamic characteristics of the rotor-bearing system. By using one single injector positioned at the bearing bottom, the damping factor associated with the first mode shape can be increased by 10 times when compared to four injectors equally pressurized.

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Analysis of orifice compensated externally pressurized gas bearings

Cited by 16 publications

References 7 publications

Effect of angular misalignment on the dynamic characteristics of externally pressurized air journal bearing

Effect of angular misalignment on the dynamic characteristics of externally pressurized air journal bearing

Comparison of the characteristics of aerostatic journal bearings considering misalignment under pure-static and hybrid condition

Adjustable hybrid gas bearing – Influence of piezoelectrically adjusted injection on damping factors and natural frequencies of a flexible rotor operating under critical speeds

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