Dynamically Loaded Journal Bearings: Mobility Method of Solution

Booker, J. F.

doi:10.1115/1.3650602

Cited by 208 publications

(74 citation statements)

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“…In a broad sense, dynamically loaded spherical joints can be classified into two main groups, namely the squeeze-film action and the wedge-film action [43][44][45][46][47][48][49][50]. The first group refers to the situations in which the ball does not rotate significantly about its center, rather the ball moves along some path inside the socket boundaries.…”

Section: Dynamics Of Spherical Jointsmentioning

confidence: 99%

Spatial rigid-multibody systems with lubricated spherical clearance joints: modeling and simulation

2009

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The dynamic modeling and simulation of spatial rigid-multi-body systems with lubricated spherical joints is the main purpose of the present work. This issue is of paramount importance in the analysis and design of realistic multibody mechanical systems undergoing spatial motion.When the spherical clearance joint is modeled as dry contact; i.e., when there is no lubricant between the mechanical elements which constitute the joint, a body-to-body (typically metal-tometal) contact takes place. The joint reaction forces in this case are evaluated through a Hertzian-based contact law. A hysteretic damping factor is included in the dry contact force model to account for the energy dissipation during the contact process. The presence of a fluid lubricant avoids the direct metal-to-metal contact. In this situation, the squeeze film action, due to the relative approaching motion between the mechanical joint elements, is considered utilizing the lubrication theory associated with the spherical bearings. In both cases, the intrajoint reaction forces are evaluated as functions of the geometrical, kinematical and physical characteristics of the spherical joint. These forces are then incorporated into a standard formulation of the system's governing equations of motion as generalized external forces. A spatial four bar mechanism that includes a spherical clearance joint is considered here as example. The computational simulations are carried out with and without the fluid lubricant, and the results are compared with those obtained when the system is modeled with perfect joints only. From the general results it is observed that the system's performance with lubricant effect presents fewer peaks in the kinematic and dynamic outputs, when compared with those from the dry contact joint model.

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Section: Dynamics Of Spherical Jointsmentioning

confidence: 99%

Spatial rigid-multibody systems with lubricated spherical clearance joints: modeling and simulation

2009

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“…The oil film pressure distribution over the surface of the bearing lining can be obtained by a hydrodynamic analysis assuming that the bearing and shaft are rigid [5]. Such analyses exist for a complete, unbroken as well as a ruptured lubricant film [6]. An unbroken film would cause negative pressure, which has been detected experimentally under moderate steady load and low eccentricity ratios [7].…”

Section: Hydrodynamic Lubricationmentioning

confidence: 99%

“…It has been argued elsewhere [5] that the film can only support a very small negative pressure before rupture occurs. Simplified methods for the determination of hydrodynamic pressure [6] assume that the extent of positive pressure regions is the same for complete and ruptured films. A special algorithm is required to deal with the non-linearity caused by film rupture or cavitation.…”

Section: Hydrodynamic Lubricationmentioning

confidence: 99%

Residual and cyclic stresses in automotive plain bearings

Syngellakis¹,

Burke-Veliz²

2012

WIT Transactions on Engineering Sciences

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This paper presents a review of existing methodologies for predicting stress and strain development in automotive plain bearings. Initially, it deals with the modelling of the forming and fitting operations, leading to the determination of residual stresses, then with the numerical processes of generating cyclic stresses and plastic strains due to the reciprocating engine forces. Modelling tools as well as their adopted assumptions and simplifications are explained. Particular attention is given to the distinction between and effects of hydrodynamic and elastohydrodynamic lubrication conditions. The output of such analyses is illustrated through the inclusion of some typical results; its significance is discussed in the context of bearing design against fatigue failure.

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“…From the relation of the crank arm and connecting rod in Fig. 2(b), the angle , angular velocity   , and angular acceleration   of the connecting rod can be written as 1 ca …”

Section: Motion Analysis Of Crank Pinmentioning

confidence: 99%

“…The investigation of the minimum oil film thickness in the engine bearing is important to prevent the above problems, and have been conducted in many studies [1][2][3][4][5]. The simulation models are classified as the methods based on hydrodynamic, elastohydrodynamic (EHD), and thermo-elasto-hydrodynamic lubrication theories [6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of lubrication performance of crank pin bearing in a marine diesel engine

2018

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Abstract:In this study, the lubrication performance of the crank pin bearing in a marine two-stroke diesel engine is evaluated to investigate the adhesional failure on the crank pin bearing. A numerical algorithm for the lubrication analysis considering motion analysis of the crank pin system is developed. The film pressure and thickness for three clearances and three lubricant temperatures are calculated. The results show that the lubricant temperature has a higher effect on film thickness than clearance. In terms of the film parameter, the operating condition that can result in solid-solid contact is investigated. We also suggest the desirable operating conditions of clearance and lubricant temperature to prevent the solid-solid contact.

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Dynamically Loaded Journal Bearings: Mobility Method of Solution

Abstract: An approach is presented for simplified analytical, graphical, and numerical solutions to extremely general problems of dynamically loaded bearings. A series of examples illustrates the application of the method to problems of varying complexity.

Cited by 208 publications

References 0 publications

Spatial rigid-multibody systems with lubricated spherical clearance joints: modeling and simulation

Spatial rigid-multibody systems with lubricated spherical clearance joints: modeling and simulation

Residual and cyclic stresses in automotive plain bearings

Evaluation of lubrication performance of crank pin bearing in a marine diesel engine

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