The algorithms FASTSIM and FASTSIM2

Vehicle-dynamic simulation includes solving many millions of contact problems in order to incorporate the wheel-rail creep force behavior. In most circumstances it is acceptable to solve these problems fast and approximately. This is accomplished in FASTSIM using Kalker's simplified theory by schematizing the material elastic behavior using independent springs.

Different variants of the FASTSIM algorithm are used for wheel-rail contact evaluation in SIMPACK Rail, GENSYS and Universal Mechanism. It is currently the best compromise between speed and accuracy when considering non-Hertzian circumstances [Vollebregt2011a], possibly including the falling friction effect [Spiryagin2013]. However, FASTSIM is not well-suited for computing the underlying traction distribution, as needed for wear [Vollebregt2015a].

FASTSIM2 is an improved variant that has reduced discretization error compared to the original FASTSIM algorithm. It is published in [Vollebregt2010b].


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