Results 91 to 100 of about 153 (135)
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Analysis of the Dynamic Characteristics of the Aerostatic Journal Bearings
Applied Mechanics and Materials, 2014This paper investigates the dynamic characteristics of the aerostatic journal bearing, the rotation center of which is not the center of the journal length. The Finite Difference Method (FDM) and the perturbation method are employed to calculate the stiffness and damping coefficients.
Chun Dong Xu +2 more
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Investigation on backflow phenomenon in the aerostatic journal bearing
Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology, 2019In this work, the backflow phenomenon exhibited in the gas journal bearings is investigated. The effect of operational parameters such as eccentricity ratio ɛ, axial velocity of the bearing v z , misalignment angles [Formula: see text] and [Formula: see text] on the backflow behavior, and ...
Xinglong Chen, Gang Bao, James K Mills
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On the modelling of hybrid aerostatic-gas journal bearings
Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology, 2011Gas journal bearings have been increasingly adopted in modern turbo-machinery applications as they meet the demands of operation at high rotational speeds, in clean environment, and with great efficiency. Due to the fact that gaseous lubricants, typically air, have much lower viscosity than more conventional oils, carrying capacity and dynamic ...
S Morosi, I F Santos
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Numerical investigation of the performance of aerostatic journal bearings
SPIE Proceedings, 2016The current study presents a detailed theoretical analysis on the performance of aerostatic journal bearings. The dimensionless Reynolds equation is derived and discretized by the finite difference method. An iterative procedure is adopted to get the air film pressure distribution.
Xinkuan Wang +4 more
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Effect of manufacturing errors on the performance of aerostatic journal bearings
Wear, 1981Abstract The results of a theoretical analysis of the effect of manufacturing errors on the performance of aerostatic journal bearings is reported. Investigations carried out to study the influence of (a) geometrical form errors such as ovality, lobing and cylindricity and (b) roughness patterns such as one-dimensional longitudinal roughness and two ...
PANDE, SS, SOMASUNDARAM, S
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Designing the Partially Porous Journal Bearings of an Aerostatic Spindle
Applied Mechanics and Materials, 2017The aerostatic journal bearings are widely used in ultra-precision machine tools. Due to remarkable ability of the porous medium in flow restriction, the porous aerostatic journal bearings are better than other types of aerostatic bearings in load carrying capacity, stiffness, damping and dynamic stability.
Te Yen Huang +2 more
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Analysis of tapered-land hybrid aerostatic journal bearings
Wear, 1982Abstract Results of the analysis of hybrid (aerostatic and aerodynamic) taperedland ournal bearings are presented. For a known bearing geometry, the Reynolds equation is reduced to a set of partial differential equations by using a first-order perturbation method. These differential equations are solved by a finite-difference numerical technique. The
PANDE, SS, SOMASUNDARAM, S
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Design of aerostatic journal bearings with partially porous walls
International Journal of Machine Tool Design and Research, 1978Abstract Steady-state characteristics of aerostatic journal bearings fed through rows of porous inserts are investigated. The use of a simplified mathematical model allows to derive relationships for the load-capacity, the stiffness, the gas flow rate and the power consumption of the bearing, as functions of the supply pressure, the relative ...
M. Szwarcman, R. Gorez
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An internally pressurized aerostatic journal bearing for thermoacoustic engines
Tribology International, 2016Abstract An internally pressurized aerostatic journal bearing suitable for thermoacoustic power converters is designed and experimentally demonstrated using a free piston oscillating in a cylinder between two gas springs. The oscillating pressures in a thermoacoustic power converter׳s cavities can be used to create a near constant flow through an air
Claudio U. Hail +2 more
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Analysis of an aerostatic journal bearing with a position-sensing restrictor
Wear, 1981Abstract A variable restrictor, in which the position of the journal is used to change the restrictor resistance, is described. A mathematical model is proposed to study the pressure distribution and air flow in the bearing. The effect of various design parameters on bearing performance characteristics such as the non-dimensional load-carrying ...
PANDE, SS, SOMASUNDARAM, S
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