Analysis of ring pack lubrication

Lee, Jae Seon; Han, Dong

doi:10.1007/bf03185795

Cited by 5 publications

(4 citation statements)

References 9 publications

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“…It can be concluded that for some crank angles, insufficient oil is being supplied to the ring face for fully flooded conditions to occur, so appropriate boundary conditions are of prime importance. Lee and Han 39 applied a piston-ring lubrication model that considers starvation to evaluate the amount of oil supplied to the ring–liner interface based on lubrication theory and oil flow continuity algorithm using open-end boundary conditions. The results show that the compression rings in the ring-pack operate under starvation for most crank angles and effective ring width was reduced by 20–30%.…”

Section: Lubrication Mechanismsmentioning

confidence: 99%

Piston ring–liner lubrication and tribological performance evaluation: A review

Delprete

Razavykia

2017

Proceedings of the Institution of Mechanical Engineers, Part J:

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Internal combustion engines are at present used as the major power sources for transportation and power generator. Improvement of the internal combustion engine efficiency is expected due to strict environmental standards and energy costs. Any reduction in oil consumption, friction power losses and emissions results in improving engines’ performance and durability. Automotive industries have intense passion to increase engines’ efficiency to meet the fuel economy and emission standards. Many studies have been conducted to develop reliable approaches and models to understand the lubrication mechanisms and calculate power losses. This review paper summarizes the synthesis of the main technical aspects considered during modeling of piston ring–liner lubrication and friction losses investigations. The literature review highlights the effects of piston ring dynamics, components geometry, lubricant rheology, surface topography and adopted approaches, on frictional losses contributed by the piston ring-pack.

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Section: Lubrication Mechanismsmentioning

confidence: 99%

Piston ring–liner lubrication and tribological performance evaluation: A review

Delprete

Razavykia

2017

Proceedings of the Institution of Mechanical Engineers, Part J:

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“…Considering rather complicated configurations of T and L-type joints, we prepared an auto-mesh generation program for combined shell/line-spring modeling [19]. Tension, bending and internal pressure loadings can be defined in various ways for T and L-type joints due to rather complicated configurations.…”

Section: Analyses Of Pipe-joints With Semi-elliptical Surface Cracksmentioning

confidence: 99%

Constraint of Semi-Elliptical Surface Cracks in T and L-Joints

Lee

Kim²

2006

KEM

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Critical defects in pressure vessels and pipes are generally found in the form of a semielliptical surface crack, and the analysis of which is consequently an important issue in engineering fracture mechanics. Furthermore, in addition to the traditional single parameter K or J-integral, the second parameter like T-stress should be measured to quantify the constraint effect. In this work, the validity of the line-spring model is investigated by comparing line-spring J-T solutions to the reference 3D finite element J-T solutions. A full 3D-mesh generating program for semi-elliptical surface cracks is employed to provide such reference 3D solutions. Then some structural characteristics of the surface-cracked T and L-joints are studied by mixed mode line-spring finite element. Negative T-stresses observed in T and L-joints indicate the necessity of J-T two parameter approach for analyses of surface-cracked T and L-joints.

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“…However in the case of the existing pin-type load cell, the measuring range is very narrow. Therefore it is necessary to develop a many-angular pin type load cell in order to measure the load in wide range [2,3].…”

Section: Introductionmentioning

confidence: 99%

Development of Many-Angular Pin Type Load Cell for a Overload Limiter of a Movable Crane

Ding

Han

2009

KEM

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An overload limiter is used to prevent its overturning accident during an operating of a movable crane. Recently the indirectly measuring method, which measures hoisting load and overturning moment of overload limiter, demands instead of the existing method, which measures only hoisting load. The indirectly measuring method is how to conduct the hoisting load and overturning moment as measuring the load of hydraulic cylinder for a luffing driving of boom. So we need to develop the many-angular pin type load cell with the measuring angle of ±10 degree instead of the existing load cell with the measuring angle of ±2 degree. In this study we conducted the finite element analysis in order to evaluate the effect of the aspect ratio of measuring cross section on the measuring limit of the load cell to develop the many-angular pin type load cell. For this investigation, the aspect ratio of measuring cross section and load applying angle were adopted as design parameters and the stresses of measuring part were evaluated for each parameter.

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Analysis of ring pack lubrication

Cited by 5 publications

References 9 publications

Piston ring–liner lubrication and tribological performance evaluation: A review

Piston ring–liner lubrication and tribological performance evaluation: A review

Constraint of Semi-Elliptical Surface Cracks in T and L-Joints

Development of Many-Angular Pin Type Load Cell for a Overload Limiter of a Movable Crane

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