A. Shinkarenko

Bio: A. Shinkarenko is an academic researcher from Technion – Israel Institute of Technology. The author has contributed to research in topics: Reynolds equation & Lubrication. The author has an hindex of 5, co-authored 5 publications receiving 493 citations.

Improving Tribological Performance of Piston Rings by Partial Surface Texturing

Abstract: An analytical model is developed to study the potential use of part ial laser surface texturing (LST) for reducing the friction between a piston ring and cylinder liner. The hydrodynamic pressure distribution and the time dependent clearance between the pi ston ring and cylinder liner are obtained from a simultaneous solution of the Reynolds equation and the ring equation of motion in the radial direction. The time behavior of the fric tion force is calculated from the shear stresses in the viscous fluid film and the time de pendent clearance. An intensive parametric investigation is performed to identify the m ain parameters of the problem. The optimum LST parameters such as dimples depth, texture area density and textured portion of the nominal contact surface of the piston ring are evaluated.

The Effect of Elastomer Surface Texturing in Soft Elasto-Hydrodynamic Lubrication

Abstract: The present study focuses on modeling the effect of elastomer surface texturing in soft elasto-hydrodynamic lubrication. The model consists of an elastomer with spherical microdimples sliding at a constant velocity relative to a rigid and smooth counterpart in the presence of viscous lubricant. The hydrodynamic lubrication and the elasticity problems are solved simultaneously for the cases of full and partial texturing of the elastomer surface. Load carrying capacity and friction force are evaluated by integration of the pressure and shear stress fields in the viscous lubricant, respectively. A parametric analysis is performed to obtain the optimum surface texturing parameters for maximum load and minimum friction.

Analysis of friction in surface textured components of reciprocating mechanism

Abstract: A model is presented to study the effects of inertia forces, squeeze film action and pressure boundary conditions on the friction force between a laser surface textured (LST) reciprocating components. The focus of the present paper is analysis of friction between LST piston ring and cylinder liner. The pressure distribution, the clearance and the friction force between the piston ring and the cylinder liner surfaces are obtained from a simultaneous solution of the Reynolds equation and the equation of motion. Two different approaches for analysis of the friction force are presented: “Real engine simulation” – based on a complete dynamic force equilibrium that takes into account the inertia forces and the squeeze film effects due to the piston ring mass and radial motion, respectively, while the pressure boundary conditions for the Reynolds equation represent realistic time variation in the cylinder pressure during the engine cycle; “Approximate solution” – based on a quasi-static force equilibrium that ne...

Influence of tribology on global energy consumption, costs and emissions

Abstract: Calculations of the impact of friction and wear on energy consumption, economic expenditure, and CO2 emissions are presented on a global scale. This impact study covers the four main energy consuming sectors: transportation, manufacturing, power generation, and residential. Previously published four case studies on passenger cars, trucks and buses, paper machines and the mining industry were included in our detailed calculations as reference data in our current analyses. The following can be concluded: Fifty years ago, wear and wear-related failures were a major concern for UK industry and their mitigation was considered to be the major contributor to potential economic savings by as much as 95% in ten years by the development and deployment of new tribological solutions. The corresponding estimated savings are today still of the same orders but the calculated contribution to cost reduction is about 74% by friction reduction and to 26% from better wear protection. Overall, wear appears to be more critical than friction as it may result in catastrophic failures and operational breakdowns that can adversely impact productivity and hence cost.