scholarly journals Numerical modelling of granular materials with spherical discrete particles and the bounded rolling friction model. Application to railway ballast

2017 ◽  
Vol 85 ◽  
pp. 220-229 ◽  
Author(s):  
Joaquín Irazábal ◽  
Fernando Salazar ◽  
Eugenio Oñate
Keyword(s):  
Numerical Modelling ◽  
Granular Materials ◽  
Rolling Friction ◽  
Friction Model ◽  
Railway Ballast ◽  
Model Application

A complementarity-based rolling friction model for rigid contacts

Meccanica ◽  
2013 ◽  
Vol 48 (7) ◽  
pp. 1643-1659 ◽  
Author(s):  
Alessandro Tasora ◽  
Mihai Anitescu
Keyword(s):  
Rolling Friction ◽  
Friction Model

Theoretical Analysis of Piston Ring Frictional Loss in an Innovative Rotating Liner Internal Combustion Engine

2005 ◽  
Author(s):  
H. Xu ◽  
M. Kim ◽  
M. D. Bryant ◽  
R. D. Matthews ◽  
T. M. Kiehne
Keyword(s):  
Piston Ring ◽  
Combustion Engine ◽  
Cylinder Liner ◽  
Rolling Friction ◽  
Friction Model ◽  
Statistical Parameters ◽  
Restoring Force ◽  
Frictional Loss ◽  
Surface Irregularities ◽  
Liner Surface

This paper presents a new lubrication model to predict piston ring friction. The average Reynolds equation is adopted to obtain the hydrodynamic component of restoring force against the cylinder liner surface. The dry or boundary lubricated component is derived from Greenwood-Tripp model. The influence of surface irregularities or roughness on the lubricant flow will be described by statistical parameters. Unlike classical piston ring mixed lubrication models, a sideslip rolling friction model is incorporated with contact simulation. Numerical results show that piston ring friction is reduced dramatically by the liner rotation.

A coupled sliding and rolling friction model for DEM calibration

2017 ◽  
Vol 72 ◽  
pp. 9-20 ◽  
Author(s):  
Zamir Syed ◽  
Mehari Tekeste ◽  
David White
Keyword(s):  
Rolling Friction ◽  
Friction Model
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