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Wednesday, July 29, 2020 | History

2 edition of The circumferential groove journal bearing considering cavitation and dynamic stability. found in the catalog.

The circumferential groove journal bearing considering cavitation and dynamic stability.

Gunnar Lundholm

The circumferential groove journal bearing considering cavitation and dynamic stability.

by Gunnar Lundholm

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  • 1 Currently reading

Published by exp. (Ingeniörsvetenskapsakad.) in Stockholm .
Written in English

    Subjects:
  • Bearings (Machinery),
  • Cavitation.

  • Edition Notes

    Bibliography: p. 88-89.

    SeriesActa polytechnica Scandinavica. Mechanical engineering series,, 42
    Classifications
    LC ClassificationsTJ7 .A25 no. 42
    The Physical Object
    Pagination89 p.
    Number of Pages89
    ID Numbers
    Open LibraryOL5514834M
    LC Control Number73456597

    Journal bearings are used in a wide range of applications due to their simplicity and derived low cost but also a reasonable load carrying capacity. On the other hand, one of the most often mentioned disadvantages of the journal bearing is the converging-diverging geometry making it prone to cavitation. The general concepts of bearing. The Journal Bearing Considering Cavitation and Dynamic Stability. PhD. Lund Andersson, Bert: On Optimum Design of Hydrodynamic Lip Seals. Tech Lic. Me 56, Acta Polytechnica Scandinavica. Stockholm Jacobson, Bo: On the Lubrication of Heavily Loaded Spherical Surfaces Considering Surface Deformations and Solidification of the.

      Recently, herringbone-grooved journal bearings have had important applications in miniature rotating machines. The scribed grooves, on either the rotating or stationary member of the bearing, can pump the lubricant inward, which generates supporting stiffness and improves the dynamic stability, especially for concentric operation. Using this concept a cavitation model is proposed. The effect of the supply pressure on fluid film reformation is also studied. The proposed model is applied to study the cavitation zone of: (1) a journal bearing with lubricant entry along the line of centers and (2) a journal bearing with inlet groove located along the load line.

      The onset and extent of gaseous cavitation in a journal bearing determines the load that can be applied to the bearing. The implosion of vapor cavitation bubbles creates some serious damage to the journal and bearing surfaces. Predicting Cavitation. The pressure of the lubricant can be computed from the Reynolds equation. pump operation stability. Previous studies of annular seals texture focus on damp rather than stiffness. Here a new spiral groove texture on cylindrical surface of annular seals is proposed. Based on the N-S equations, CFD method considering cavitation is used to simulate the internal flow of the spiral groove .


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The circumferential groove journal bearing considering cavitation and dynamic stability by Gunnar Lundholm Download PDF EPUB FB2

'The circumferential groove journal bearing considering cavitation and dynamic stability' Acta Poly- technica Scandinavica, Mech Eng Series No 42, Stockholm 5 Floberg, L. 'On the optimum design of sector-shaped tilting- pad thrust beaxings' A cta Polytechnica Scandinavica, Mech Eng Series No 45, Stockholm 6 Jacobson, : L.

Floberg. The purpose of this paper was to study dynamic characteristics for high-speed water-lubricated spiral groove thrust bearing considering cavitating effect. A lubrication model was established with multiple gas-liquid interface effects, the evolution of bubble volume caused by breakage and coalescence of bubbles was quantitatively described using Cited by: 1.

Taylor, Cavitation of a viscous fluid in narrow passages, Fluid Mech. 16, () G. Lundholm, The circumferential groove journal bearing considering cavitation and dynamic stability, Acta Poly.

Scand. Mech. Eng., Ser Stockolm ()Cited by: Lundholm, G.,“The Circumferential Groove Journal Bearing Considering Cavitation and Dynamic Stability,” Acta Polytechnica Scandinavica, Mech. Engr. Series Cited by: 5.

Rao and Sawicki found that gaseous cavitation has no significant effect on the dynamic coefficients thus stability of elliptical and 2-axial groove journal bearings [3].

The Circumferential Groove Journal Bearing Considering Cavitation and Dynamic Stabifity. A cta Poly- technica Scandinavia, Mech. Eng. Series No. 42, Strength of Metals and Alloys Edited by P. Haasen, V. Gerold and G.

Kostorz These volumes are the proceedings of the 5th International Conference on the Strength of Metals and Alloys, Aachen, Federal Republic of Germany.

The hydrodynamic journal bearing offer a wide range of application. This is due to the simple design and high sustainability. The life of a plain bearing depends on many factors. Among other cavitation can lead to a breakdown of the bearing. Investigation of cavitation in journal bearings.

Dynamic characteristics of the herringbone grooved gas journal bearings (HGGJB) under uid-structure interactions are systematically investigated using the nite element method. Stability and bearing capacity of the HGGJB are estimated and compared with those of the plain gas journal bearings.

The bearing is modelled as a spring-damper with the dynamic coefficients. The stability analysis of the rigid rotor/bearing system showed that slip length B has negative effects on load capacity W.

fect on the stability of a finite journal bearing operating with a low viscosity lubricant under high speed. A linear perturbation tech-nique was used to evaluate dynamic characteristics of the journal bearing in two dimensions. A non-Newtonian lubricant was used in Lin (27) to study the stiffness and damping characteristics in.

In the present study, the fluid models of a hydrodynamic journal bearing and a herringbone-grooved journal bearing to be investigated are shown in Figure the journal bearing shown in Figure 1(a), the diameter of the shaft (D) is mm and the length of the shaft (L) depends on the ratio of L/D, varying from L/D= to The radial clearance between the shaft and bearing is mm.

A large wealth of literature is reported for the theoretical modelling and experimental verification of cavitation in journal bearing [8,9, 12, 13].

In contrast, little attention has been paid. Jang, G. and Yoon, J. W., “ Nonlinear Dynamic Analysis of a Hydrodynamic Journal Bearing Considering the Effect of Rotating or Stationary Groove,” Journal of Tribology,pp.

Stability characteristics of the herringbone grooved journal bearings (HGJBs) are analyzed taking into account cavitation of the fluid flow.

The perturbed values of pressure and film thickness from a given equilibrium position are substituted into the Elrod’s universal equation, which considers mass conservation in the complete bearing geometry.

PDF | On Sep 1,Rosli Hj Yusof and others published Analysis of the Stability of Elliptical Journal Bearings under Vapor Cavitation Erosion | Find, read and cite all the research you need on. Bearings are used to prevent friction between parts during relative movement.

In machinery they fall into two primary categories: anti-friction or rolling element bearings and hydrodynamic journal bearings. The primary function of a bearing is to carry load between a rotor and the case with as little wear as possible. The influence of mass-conserving cavitation modeling approaches on the stability of rotors in journal bearings is investigated.

The model consists of a rotor represented by a flexible multibody. Cavitation has been neglected in the previous analyses of the herringbone grooved bearing. Load capacity and bearing torque are increased due to the increase of eccentricity and L / D and the decrease of the groove width ratio.

The maximum load capacity was found to occur at a groove angle of 30 degrees while bearing torque remains constant due. 1. Introduction. In the classical work, Sommerfeld found analytical solution for infinitely long oil journal bearings with a single oil hole located at the unloaded region.

Ocvirk, using a narrow bearing approximation, provided a steady state solution of full oil journal Christopherson and Raimondi and Boyd gave numerical solutions of finite oil journal bearings. Steady-state and stability characteristics of herringbone grooved journal bearings (HGJBs) are found considering thermal effect.

The temperature of the fluid film rises significantly due to the frictional heat, thereby the viscosity of the fluid and the load carrying capacity decrease. ().

Stability of the high-speed journal bearing under steady load. (). Static and dynamic properties of partial journal bearings. (). The axial groove journal bearing considering cavitation and dynamic stability. (). The circumferential groove journal bearing considering cavitation and dynamic stability.

().‘The circumferential groove journal bearing considering cavitation and dynamic stability.journal bearings under a constant and variable rotating load. Claro and Mirinda [] studied the journal bearing characteristics by considering the lubricant suppy conditions.

Mishra and Kumar [] presented the effects of geometric change on stability of hydrodynamic journal bearing due to wear.