Our theories for rolling contact come in different forms.
Stand-alone CONTACT program
The stand-alone program works on the basis of a textual input-file. A basic GUI is provided for operating the program. The results are inspected mostly in MATLAB®.
- The free version of
CONTACT implements Kalker's original theories [Kalker1990] and
Vollebregt's fast solver algorithms, e.g.
- The Extended CONTACT model provides the same, plus Vollebregt's extensions for conformal contact, 3rd body layers and falling friction, see [Vollebregt2014d], [Vollebregt2014c].
The CONTACT library
The CONTACT library provides access to CONTACT's computational core for other softwares. Practically all functionality is accessible through a well-defined interface.
- The CONTACT library for
MATLAB® is a dll with an easy set of wrapper
routines. This allows to build ones own programs in MATLAB®,
creating cases on the fly and processing the results in a flexible way.
- The Kalker CONTACT add-on to
SIMPACK Rail provides an extension to SIMPACK Rail. This allows to
inspect the detailed contact stresses for wear and damage analyses.
- The CONTACT add-on to
Universal Mechanism is fully integrated in UM. This allows to
compute vehicle stability and inspect derailments using Kalker's "full
- The CONTACT add-on to GENSYS is fully integrated in GENSYS. This is currently in a pre-oprational stage.
USETAB and other CONTACT tables
Creep-force tables allow advanced theories to be used in vehicle dynamic simulation, where many millions of cases must be computed.
- USETAB is Kalker's program
from 1996, providing a table of 100.000 results and a corresponding
- An improved table was computed for VAMPIRE® in 2005. Today, we offer additional tables on the basis of the Extended CONTACT theory.
The algorithms FASTSIM and FASTSIM2
Despite its drawbacks, FASTSIM is still the method of choice for many rail vehicle simulation packages. It is fast and able to deal with non-Hertzian circumstances.
- ROLLEN is Kalker's program implementing the original FASTSIM
- FASTSIM2 is our variant with improved accuracy. It is published
in the OpenAccess paper
[Vollebregt2010b]. E.A.H. Vollebregt and P. Wilders, FASTSIM2: a second-order accurate frictional rolling contact algorithm. Computational Mechanics, 2010.