Creep force modelling for rail traction vehicles based on the Fastsim algorithm

Wheel-rail creep force model for predicting water induced low adhesion phenomena

“…Likewise, in the simplified theory of rolling contact, which is implemented in the algorithm FASTSIM [Kalker 1982], the influence of water can be considered by adjusting the coefficient of friction in terms of BL. Spiryagin [Spiryagin 2013] extended the FASTSIM algorithm by a variable contact flexibility and a slip dependent friction law to allow a better reproduction of measured creep curves. The Polach model [Polach 1999, Polach 2005] is a computationally fast alternative to the FASTSIM algorithm, built on the theory of BL as well.…”

Modelling of track wear damage due to changes in friction conditions: A comparison between AC and DC electric drive locomotives

“…The Polach contact mechanics model is widely used to determine the longitudinal tractive force due to the interaction between the wheelsets and rail tracks as it is efficient and compares well with field measurements [14] and more complex models [15]. Therefore the Polach model is employed in this research for efficiency.…”

A Novel Analytical Method to Calculate Wheel-Rail Tangential Forces and Validation on a Scaled Roller-Rig

“…This variation of the adhesion is usually taken into account in the other methods [13,[15][16][17] by considering a friction coefficient , variable as a function of the vehicle velocity, creepage, or other parameters (environmental conditions, track contamination).…”

“…Polach, in addition, developed an extension of his method in order to investigate adhesion in nonsteady condition related to traction, also considering different environmental conditions, by modifying his original method to include these aspects [13]. Also the algorithms developed by Kalker have been recently improved by Vollebregt, by increasing the accuracy of FASTSIM in the FASTSIM2 version [14] and implementing in the more complex CONTACT code the effect of "falling friction" versus the creepage [15,16], which was already introduced by Polach in his extended method [13,17]. Nowadays FASTSIM and Polach's methods are commonly used in multibody codes, to investigate railway vehicle dynamic.…”