The Influence of Cylinder Lubrication on Piston Slap

Gerges, Samir N. Y.; Luca, Julio Cesar de; Lalor, N.

doi:10.1006/jsvi.2002.5051

Cited by 16 publications

(10 citation statements)

References 11 publications

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“…Scientists have been also made great efforts on reducing sound pollution resulting from piston dis-alignment in cylinder, which originates from asymmetry of crank and slider mechanism [25][26][27][28][29][30]. Researches have also come to focus on very complicated mechanisms that diminish vibrations and internal friction in these facilities.…”

Section: Introductionmentioning

confidence: 99%

A new and efficient mechanism for spark ignition engines

Shadloo¹,

Poultangari²,

Jamalabadi³

et al. 2015

Energy Conversion and Management

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Section: Introductionmentioning

confidence: 99%

A new and efficient mechanism for spark ignition engines

Shadloo¹,

Poultangari²,

Jamalabadi³

et al. 2015

Energy Conversion and Management

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“…This was solved by introducing a coefficient known as a damping factor to compensate for the overestimation in such cases. 21 Cho et al presented an analytical model to simply calculate the impact force imposed by piston slap. The model considers longitudinal and rotational motions around the wrist pin.…”

Section: Hydrodynamic Lubrication (Hl)mentioning

confidence: 99%

Piston dynamics, lubrication and tribological performance evaluation: A review

Delprete

Razavykia

2018

International Journal of Engine Research

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Mechanical power loss of lubricated and bearing surfaces serves as an attractive domain for study and research in the field of internal combustion engines. Friction reduction at lubricated and bearing surface is one of the most cost-effective ways to reduce gas emission and improve internal combustion engines’ efficiency. This thus motivates automotive industries and researchers to investigate tribological performance of internal combustion engines. Piston secondary motion has prime importance in internal combustion engines and occurs due to unbalanced forces and moments in a plane normal to the wrist pin axis. Consequently, piston executes small translations and rotations within the defined clearance during the piston reciprocating motion. Mechanical friction power loss and lubrication at piston skirt/liner and radiated engine noise are dramatically affected by piston secondary dynamics. The lubrication mechanism, piston secondary motion and tribological performance are affected by piston design parameters (piston/liner clearance, wrist pin offset, skirt profile, etc.), lubricant rheology, oil transport mechanism and operating conditions. Therefore, this review is devoted to summarize the synthesis of main technical aspects, research efforts, conclusions and challenges that must be highlighted regarding piston skirt/liner lubrication and piston dynamics and slap.

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“…ere is another lumped parameter model with eight degrees of freedom which is developed using the dynamic characteristics of the piston, connecting rod, cylinder wall, and engine block. In [8], the time history of the piston slap force is determined, and the spectra of the force are compared for different operational regimes of the engine. A finite element method (FEM) has also been applied in order to analyze the impact forces [9].…”

Section: Introductionmentioning

confidence: 99%

Vibration Analysis of a Single‐Cylinder Reciprocating Compressor considering the Coupling Effects of Torsional Vibration

Liu

Shuai

et al. 2019

Shock and Vibration

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A piston slap is one of the main vibration sources of the reciprocating machinery. Much work has been done in this field, most of which was based on a constant rotating speed. However, in practice, the speed of a crankshaft may always fluctuate due to the uneven load or excitation. The inertia forces of moving components are much different at the fluctuating rotating speed comparing with that at a constant speed. In this paper, the piston slap and the induced vibration are analyzed based on the instantaneous angular speed measured on a single-cylinder reciprocating compressor. Firstly, the dynamics of a crank-connecting rod mechanism is analyzed based on the measured instantaneous angular speed which contains the torsional vibration of the air compressor. The time histories of piston slap impact forces considering and without considering torsional vibration are compared. Then, in order to correlate the piston slap impact with the slap-induced vibration, the corresponding transfer functions between the middle stroke of the outer surface of the cylinder liner and the excitation points are measured. And the excitation force on the main bearing is also taken into account to bring the simulation closer to the experimental results. The effects of a torsional vibration on the vibration of the cylinder liner are analyzed, and the simulation results show that the torsional vibration is a factor that must be taken into account in the vibration analysis of the single-cylinder reciprocating compressor.

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The Influence of Cylinder Lubrication on Piston Slap

Cited by 16 publications

References 11 publications

A new and efficient mechanism for spark ignition engines

A new and efficient mechanism for spark ignition engines

Piston dynamics, lubrication and tribological performance evaluation: A review

Vibration Analysis of a Single‐Cylinder Reciprocating Compressor considering the Coupling Effects of Torsional Vibration

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