Analyzing viscoelastic effects in piston skirts EHL at small radial clearances in initial engine start up

Qasim, Syed Adnan; Chaudhri, Usman F.; Malik, M. Afzaal

doi:10.1016/j.triboint.2011.09.005

Cited by 12 publications

(6 citation statements)

References 11 publications

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“…However, most of the current researches on the lubrication of piston skirt-cylinder liner are analyzed generally under only one working condition (such as rated working condition or maximum torque working condition) of internal combustion engine. There are the researches under several working conditions 1,24,26 or start-up working condition 8,9,20,21,25 of engine, but these considered engine working conditions does not cover full range of the working condition of internal combustion engine with different engine speeds and loads. In actual normal use, the working condition of internal combustion engine (especially the internal combustion engine used in the vehicle) is constantly changed under different speeds and loads.…”

Section: Introductionmentioning

confidence: 99%

Study on the lubrication of piston skirt-cylinder liner under the engine working conditions of different speeds and loads

Sun

Zhu

Wang

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part J:

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The working condition (speed and load) of internal combustion engine is one of important factors affecting the lubrication performance of piston skirt-cylinder liner. In actual normal use, the working condition of internal combustion engine is constantly changed under different speeds and loads. However, the current lubrication performance of piston skirt-cylinder liner is analyzed generally under only one or several working conditions of internal combustion engine, in which the working conditions does not cover full range of different engine speeds and loads. In addition, it is generally assumed in current studies that the piston skirt is fully lubricated in all strokes of an engine working cycle. In this paper, a four-stroke internal combustion engine is taken as the research object, the lubrication performance of piston skirt-cylinder liner under full working condition range of internal combustion engine with different engine speeds and loads are analyzed, in which the lubrication status of piston skirt is determined by considering the actual lubricating oil transport. The results show that there are differences in the lubrication performance of piston skirt-cylinder liner under different working conditions of internal combustion engine. The rated working condition of internal combustion engine may not be the most unfavorable working condition to the lubrication performance of piston skirt. Therefore, it is necessary to analyze the lubrication performance of piston skirt under full working condition range of internal combustion engine with different speeds and loads when the piston assembly is designed.

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Section: Introductionmentioning

confidence: 99%

Study on the lubrication of piston skirt-cylinder liner under the engine working conditions of different speeds and loads

Sun

Zhu

Wang

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part J:

View full text Add to dashboard Cite

show abstract

“…At present, most research in this area has focused on the startup process of high-speed automobile engines. Scholars have conducted in-depth studies on performance prediction models and optimization schemes of critical friction pairs in automotive engines during the startup process [23][24][25][26][27][28]. However, related studies on the startup process of low-speed marine diesel engines have yet to be reported.…”

Section: Introductionmentioning

confidence: 99%

Transient tribo-dynamic analysis of crosshead slipper in low-speed marine diesel engines during engine startup

Meng

Dong

et al. 2020

Friction

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A crosshead slipper-guide system, which bears a significant thrust force, is an essential friction pair in low-speed marine diesel engines. Owing to the low moving speed of the crosshead slipper during engine startup, it is difficult to form good hydrodynamic lubrication between the crosshead slipper and guide. Therefore, a detailed analysis of the crosshead slipper during engine startup is needed. In this study, a new transient tribo-dynamic model for a crosshead slipper during the engine startup process is presented. The model consists of a mixed lubrication model of the crosshead slipper-guide and dynamic models of the piston assembly, crosshead assembly, connecting rod, and crankshaft. The tribo-dynamic performances of the crosshead slipper during startup and under the rated conditions were simulated and compared. The results show that the tribo-dynamics of the crosshead slipper during the startup process are significantly different from those under the rated conditions. Some measures beneficial for the low friction of a crosshead slipper-guide under the rated conditions may significantly increase the friction loss of the crosshead slipper-guide system during the startup process.

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“…But at higher pressure zone of engine cycle (300-400 • cycle), where the gas pressure is dominant, and the film thickness reduced to as low as the roughness height of the surface, but still there is no asperity interaction that leads to mixed nature of transient regime of lubrication (Rahmani et al, 2012). In such case the effect of roughness height is felt in flow of lubricant (Tripp and Greenwood, 1970;Qasim et al, 2012;Mishra, 2013).…”

Section: Introductionmentioning

confidence: 99%

Modeling for Design Optimization of Piston Crown Geometry Through Structural Strength and Lubrication Performance Correlation Analysis

Mishra

Kumar

2019

Front. Mech. Eng.

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Piston subsystem is subjected to very complex but dynamic forces. Such forces include combustion gas force, inertial dynamics forces, lubricating action/damping forces, contact friction forces to name a few. Further, piston ring mounted in piston in addition to these forces experiences out ward springing action inside engine mounting due to inherent elasticity. To evaluate the strength of reciprocating piston, the simultaneous effect of all these forces should be considered, while simulating through finite element method. With effect of all these forces, the currently considered piston of Gray Cast Iron, aluminum alloy and Metal-Metric-Composite (Si-C) are given four different crown shapes for optimization of material and crown geometry for better strength. The rings mounted are considered to be coated with Nickasil. The combined numerical simulation for contact and finite element simulation of structural strength and their correlation suggest many important outcomes. Von-Misses stress is maximum in case of type-B Al-alloy crown, while it is minimum in case of type-C SiC metal matrix piston.

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Analyzing viscoelastic effects in piston skirts EHL at small radial clearances in initial engine start up

Cited by 12 publications

References 11 publications

Study on the lubrication of piston skirt-cylinder liner under the engine working conditions of different speeds and loads

Study on the lubrication of piston skirt-cylinder liner under the engine working conditions of different speeds and loads

Transient tribo-dynamic analysis of crosshead slipper in low-speed marine diesel engines during engine startup

Modeling for Design Optimization of Piston Crown Geometry Through Structural Strength and Lubrication Performance Correlation Analysis

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