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Journal ArticleDOI

Characteristics of multipad hydrostatic thrust bearings under rotation

16 Nov 1981-Wear (Elsevier)-Vol. 93, Iss: 2, pp 219-231
TL;DR: In this paper, a theoretical study of the characteristics of a multipad plane hydrostatic thrust bearing was made taking into account the effect of rotational lubricant inertia, and design data for the load capacity, flow and stiffness and damping characteristics were obtained for practically useful radius and resistance ratios for capillary and orifice compensation.
About: This article is published in Wear.The article was published on 1981-11-16. It has received 28 citations till now. The article focuses on the topics: Thrust bearing.
Citations
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Journal ArticleDOI
TL;DR: In this article, the performance of a 4-pocket hydrostatic conical journal bearing system was studied theoretically and numerically simulated results indicated that the lubricant flow rate is significantly reduced in case of conical bearing vis a vis the corresponding similar circular hydrostatic journal bearing.

50 citations

Journal ArticleDOI
TL;DR: In this article, an analytical study concerning the influence of wear on the performance of a four pocket hybrid conical journal bearing compensated with an orifice restrictor has been presented, where the Reynolds equation governing the flow of lubricant in the clearance space of bearing has been solved using FEM and the Newton Raphson method.

40 citations

Journal ArticleDOI
Shigeka Yoshimoto1, Y. Anno1, M. Tamura1, Y. Kakiuchi1, K. Kimura 
TL;DR: In this paper, the static characteristics of water-lubricated hydrostatic conical bearings with spiral grooves were described and compared with experimental results. But the results were limited to high speed spindles.
Abstract: This paper describes the static characteristics of water-lubricated hydrostatic conical bearings with spiral grooves. Hydrostatic conical bearings treated here have been designed for high speed spindles and are intended to apply to spindles for drilling small holes of printed circuit-boards. Pressurized water is first fed to the inside of the rotating shaft and supplied to spiral grooves on the shaft surface through feeding holes. Therefore, water pressure is greatly increased at outlets of feeding holes due to the centrifugal force by shaft rotation. Furthermore, water pressure is also increased by the viscous pump effect of spiral grooves. Water pressures in the bearings under concentric condition are numerically obtained by using the finite element method and calculated results are compared with experimental ones. It is consequently found that this water-lubricated hydrostatic conical bearings with spiral grooves are very suitable for precision high speed spindles.

27 citations

Book ChapterDOI
01 Jan 1997
TL;DR: This chapter provides an overview of some important dynamic theories in linguistics and artificial intelligence and shows the way in which these fit into the general perspective on communication.
Abstract: Publisher Summary This chapter provides an overview of some important dynamic theories in linguistics and artificial intelligence and shows the way in which these fit into the general perspective on communication. It contains some more general logical considerations on dynamic phenomena, discussing various ways to model their logic and the way the logic that emerges is related to its classical static predecessors. Natural language involves different dynamic mechanisms. Discourse representation theory and dynamic predicate logic highlight changing anaphoric bindings, whereas Veltman's Update semantics focuses on information flow and epistemic statements about its stages. The basic ideas of Heim's file change semantics (FCS) and Kamp's discourse representation theory (DRT) are very much the same. While in Heim's theory the readers or hearers of a text represent the information that they have obtained by means of a file, DRT lets them keep track of that information with the help of a discourse representation structure.

26 citations

Journal ArticleDOI
01 Aug 1983-Wear
TL;DR: In this paper, the characteristics of multirecess conical hydrostatic thrust bearings were studied theoretically taking into account the effect of rotational lubricant inertia on load capacity, flow, stiffness and damping characteristics for the practically useful aspect and resistance ratios for capillary and orifice compensations.

24 citations

References
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Journal ArticleDOI
TL;DR: In this paper, the dynamic behavior of a hydrostatic thrust bearing is analyzed based on an equivalent spring-damper system, and the results indicate that the dynamic stiffness of a massless system is at all times greater than the static stiffness and that a considerable degree of damping is always present.

28 citations

Journal ArticleDOI
TL;DR: In this paper, the static and dynamic behavior of a hydrostatic thrust bearing has been fully analyzed starting from the Navier-Stokes equations for two-dimensional flow, and an expression has been derived giving the force exerted by the oil in terms of the variables, amplitude of vibration, thickness of oil film and frequency.

26 citations

Journal ArticleDOI
01 Jun 1958-Wear
TL;DR: In this paper, the effect of neglecting inertia on the load capacity of hydrostatic thrust-bearings of the lubricant inertia is examined for both liquid and gaseous lubricants.

23 citations