Effects of tilt on the characteristics of multirecess hydrostatic thrust bearings under conditions of no rotation
TL;DR: In this paper, the effects of tilt on the behavior of capillary-compensated four-recess plane hydrostatic thrust bearings were studied for conditions of no rotation and the Reynolds equation was solved by the finite difference method to obtain the pressure distribution.
About: This article is published in Wear.The article was published on 1983-12-15. It has received 22 citations till now. The article focuses on the topics: Thrust bearing & Tilt (optics).
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TL;DR: In this paper, the theoretical analysis of tapered land aerostatic thrust bearings operating under conditions of tilt and rotation is reported, and the effects of various design and operational parameters, such as the taper, size of pad, supply pressure, tilt angle and speed of rotation on the load-carrying capacity, stiffness and mass flow rate of the bearings are reported.
4 citations
TL;DR: In this article, the authors presented a simplified method to predict the pressure of the recess, no matter whether the tilt center coincides with the geometric center of the hydrostatic journal bearings.
Abstract: This paper aims to present a simplified method to predict the pressure of the recess, no matter whether the tilt center coincides with the geometric center of the hydrostatic journal bearings.,To validate the effectiveness of the presented model, computational fluid dynamics (CFD) method and experimental method are performed in this study.,By comparing the CFD results and the experimental results, the pressure of the recess is related to the tilt direction, the tilt center, the width of the land and the circumferential angle of the land.,The mathematic model requires equivalent resistance of land edge – tilt position, tilt direction, tilt angle and the thickness of oil film instead of any digital iteration. Furthermore, a novel experimental apparatus including a circular hydrostatic bearing called ball bearing is designed to study the tilt effect produced by manufacturing error and offset load force on the pressure of the recess.
4 citations
TL;DR: In this article, the authors have used the lubrication theory and the Computational Fluid Dynamics to simulate influence of flow capacity on temperature of sector cavity multi-pad hydrostatic thrust bearing, to gain relationship between inlet flow capacity and temperature.
Abstract: Temperature field of sector cavity multi-pad hydrostatic thrust bearing is significantly affected by flow capacity, and different flow capacity can carry different shearing heat, so temperature field of oil film is obviously changed. For this problem, the lubrication theory and the Computational Fluid Dynamics have been used to simulate influence of flow capacity on temperature of sector cavity multi-pad hydrostatic thrust bearing, to gain relationship between inlet flow capacity and temperature of sector cavity multi-pad hydrostatic thrust bearing, achieve the optimal design of such products. Results are shown that along with the flow capacity increasing, the temperature of hydrostatic thrust bearing also becomes lower under constant rotational speed condition.
3 citations
TL;DR: In this paper, the authors theoretically analyzed the influence of angular velocity on the bearing temperature performance according to lubricating theory and computational fluid dynamics, and revealed its temperature distribution law of gap oil film.
Abstract: In order to solve the thermal deformation of the hydrostatic center frame in the heavy type horizontal lathe, a simulation research concerning temperature field of hydrostatic center frame is described. The Finite Volume Method of CFX has been used to compute three-dimensional temperature field of gap fluid between workpiece and bearing pillow. This research theoretically analyzes the influence of angular velocity on the bearing temperature performance according to lubricating theory and computational fluid dynamics, and it has revealed its temperature distribution law of gap oil film. Results indicate that an improved characteristic will be affected by angular velocity easily, and oil cavity temperature increases by gradually with angular velocity enhancing. Through this method, the safety of a hydrostatic center frame can be forecasted, and the optimal design of such products can be achieved, so it can provide reasonable data for design, lubrication, experience and thermal deformation computation for hydrostatic center frame in the heavy type horizontal lathe.
3 citations
TL;DR: In this paper, the authors proposed a method for finding the maximum rotational speed of an inclined turntable at which the stability of the bearing oil film is maintained, where the finite difference method was used to solve the Reynolds equation.
Abstract: This paper aims to propose a method for finding the maximum rotational speed of an inclined turntable at which the stability of the bearing oil film is maintained.,The finite difference method was used to solve the Reynolds equation. Variation of bearing capacity of a tilted hydrostatic turret over time was determined. The combined effect of tilt and rotational speed of the turret on the oil film stability was also analyzed.,When the turntable is operated at low speeds with only small angle of tilt, stability of the oil film is maintained. At lower rotational speeds, a smaller angle of tilt improves the bearing capacity and ensures stability of the oil film. Whereas, higher rotational speeds can have a considerable influence on the bearing capacity.,The results demonstrate that the inclination or tilt of the turntable significantly affects the stability of the oil film.
2 citations
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19 citations
01 Jun 1970
TL;DR: An experimental and theoretical investigation was carried out into the effects of tilt on the operation of circular hydrostatic thrust pads, the results of which show that the characteristics of a tilted pad can be reliably predicted, assuming the lubricant to be isoviscous as mentioned in this paper.
Abstract: The majority of hydrostatic thrust bearings are designed on the assumption that the bearing surfaces are parallel but, with the possibility of manufacturing and assembly errors and structural deformations, this condition is rarely, if ever, achieved in practice. With the increasing demands being made in modern machinery, more detailed design information is required.An experimental and theoretical investigation was carried out into the effects of tilt on the operation of circular hydrostatic thrust pads, the results of which show that, for static conditions, the characteristics of a tilted pad can be reliably predicted, assuming the lubricant to be isoviscous. With this information, a thrust pad can be designed to operate in any specified tilted configuration or can be incorporated in a rigorous structural design. In many applications, however, it may be difficult to specify the tilt and in such situations it is more useful for the designer to have some indication of how the operating conditions may be mod...
14 citations
TL;DR: In this paper, the axial motion of an externally pressurized thrust bearing is analyzed and an analog computer solution of the equation of motion is compared with the results of the corresponding, small displacement equation.
Abstract: Equations relating the flow of the lubricant and the axial motion of an externally pressurized thrust bearing are developed. The bearing is shown to be stable when the fluid is incompressible. Expressions for local stiffness and damping coefficients, useful in the evaluation of the dynamic response of the bearing, are given. An analog computer solution of the equation of motion is compared with the results of the corresponding, small displacement equation. (auth)
6 citations