Hydrodynamic Theory (9)

Matlab routines solving a linear complementarity problem appearing in lubrication with cavitation. Can also be found at the file exchange at MATLAB central.   Read More

Tribology Simulator is a software for the simulation of the most common tribological contact – a contact of two surfaces in a sliding motion. Besides the macro geometry surfaces can have microgeometry or nanogeometry (roughness). The contact may also be lubricated or dry. Examples of the problems that can be solved with Tribology Simulator: nominally smooth hydrodynamic simulation, nominally smooth and rough contact simulation (pressure and subsurface stress calculations, deflections), Stribeck Curve simulation (calculation of friction in mixed lubricated contacts), calculation of contact temperatures in solids, wear and wear particles simulation and surface roughness evolution, tribofilm generation. A manual can be found in the Help section. If you dont have MATLAB installed, you will need to install the MATLAB Compiler Runtime (MCR, free for download). See readme.txt file for further details. Solvers are based on the half-space approximation theory for the contact, thermal and hydrodynamic simulations, which makes it faster compared to Finite Element Method or other fully numerical approaches.   Read More

A Matlab code (GUI) for calculation of friction coefficient in mixed lubricated conditions. Asperity based, including statistical (Greenwood and Williamson), deterministic models. Fully elastic and elastic-plastic deformation regimes. Both point and line contact cases considered. Applicable to the contact with uniform film thickness (highly loaded). Moes fit is used to calculate central film thickness. Run stribeck_simulator.m.   Read More

A Matlab based line contact EHL solver with artificial diffusion for highly loaded cases. The degree of the diffusion is controlled. Fully coupled, differential deflection based numerical scheme. Finite difference discretization, central difference approximation of the pressure term and 2-nd order backward difference approximation of the wedge term. Roelands pressure-viscosity relation. It is designed for solving highly loaded cases. Newtons numerical solver is used. Launch run_numerical.m.   Read More

A Matlab based line contact EHL solver. Fully coupled, differential deflection based numerical scheme. Finite difference discretization, central difference approximation of the derivatives. Roelands pressure-viscosity relation. It is optimized for lightly deforming contacts. Newtons numerical solver is used. Fast to converge, accurate solution. Launch run_numerical.m.   Read More

A Matlab code for calculation of a semi-analytical solution of transient 1D Reynolds equation using Grubin's approximation. At first, the Reynolds equation is integrated analytically using Grubin's assumptions with respect to spatial coordinate and further numerically integrated with respect to temporal coordinate. Solution is then compared to the analytical Grubin’s solution for the central film thickness.   Read More

A Matlab code for calculation of a semi-analytical solution of transient 1D Reynolds equation for rigid-isoviscous case. At first, the Reynolds equation is integrated analytically with respect to spatial coordinate and further numerically integrated with respect to temporal coordinate. Solution is then compared to the analytical Martin’s solution for the central film thickness.   Read More

A Matlab file with the analytical solution of 1D Reynolds equation with possibility to specify the cavitation pressure. If cavitation pressure is set to atmosphere pressure, you get Martin’s solution. Derivation is also attached.   Read More

Calculates central film thickness for line and point contacts using Moes fit.   Read More