### Abstract

In most rail vehicle dynamics simulation packages, tangential solution of the wheel–rail contact is gained by means of Kalker’s FASTSIM algorithm. While 5–25% error is expected for creep force estimation, the errors of shear stress distribution, needed for wheel–rail damage analysis, may rise above 30% due to the parabolic traction bound. Therefore, a novel algorithm named FaStrip is proposed as an alternative to FASTSIM. It is based on the strip theory which extends the two-dimensional rolling contact solution to three-dimensional contacts. To form FaStrip, the original strip theory is amended to obtain accurate estimations for any contact ellipse size and it is combined by a numerical algorithm to handle spin. The comparison between the two algorithms shows that using FaStrip improves the accuracy of the estimated shear stress distribution and the creep force estimation in all studied cases. In combined lateral creepage and spin cases, for instance, the error in force estimation reduces from 18% to less than 2%. The estimation of the slip velocities in the slip zone, needed for wear analysis, is also studied. Since FaStrip is as fast as FASTSIM, it can be an alternative for tangential solution of the wheel–rail contact in simulation packages.

Language | English |
---|---|

Pages | 748-764 |

Number of pages | 17 |

Journal | Vehicle System Dynamics |

Volume | 54 |

Issue number | 6 |

Early online date | 7 Mar 2016 |

DOIs | |

Publication status | Published - 2016 |

Externally published | Yes |

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### Cite this

*Vehicle System Dynamics*,

*54*(6), 748-764. https://doi.org/10.1080/00423114.2016.1156135

}

*Vehicle System Dynamics*, vol. 54, no. 6, pp. 748-764. https://doi.org/10.1080/00423114.2016.1156135

**An alternative to FASTSIM for tangential solution of the wheel–rail contact.** / Sh. Sichani, Matin; Enblom, Roger; Berg, Mats.

Research output: Contribution to journal › Article

TY - JOUR

T1 - An alternative to FASTSIM for tangential solution of the wheel–rail contact

AU - Sh. Sichani, Matin

AU - Enblom, Roger

AU - Berg, Mats

N1 - No full text in Eprints. Accepted 13 Feb 2016. HN 12/10/2017

PY - 2016

Y1 - 2016

N2 - In most rail vehicle dynamics simulation packages, tangential solution of the wheel–rail contact is gained by means of Kalker’s FASTSIM algorithm. While 5–25% error is expected for creep force estimation, the errors of shear stress distribution, needed for wheel–rail damage analysis, may rise above 30% due to the parabolic traction bound. Therefore, a novel algorithm named FaStrip is proposed as an alternative to FASTSIM. It is based on the strip theory which extends the two-dimensional rolling contact solution to three-dimensional contacts. To form FaStrip, the original strip theory is amended to obtain accurate estimations for any contact ellipse size and it is combined by a numerical algorithm to handle spin. The comparison between the two algorithms shows that using FaStrip improves the accuracy of the estimated shear stress distribution and the creep force estimation in all studied cases. In combined lateral creepage and spin cases, for instance, the error in force estimation reduces from 18% to less than 2%. The estimation of the slip velocities in the slip zone, needed for wear analysis, is also studied. Since FaStrip is as fast as FASTSIM, it can be an alternative for tangential solution of the wheel–rail contact in simulation packages.

AB - In most rail vehicle dynamics simulation packages, tangential solution of the wheel–rail contact is gained by means of Kalker’s FASTSIM algorithm. While 5–25% error is expected for creep force estimation, the errors of shear stress distribution, needed for wheel–rail damage analysis, may rise above 30% due to the parabolic traction bound. Therefore, a novel algorithm named FaStrip is proposed as an alternative to FASTSIM. It is based on the strip theory which extends the two-dimensional rolling contact solution to three-dimensional contacts. To form FaStrip, the original strip theory is amended to obtain accurate estimations for any contact ellipse size and it is combined by a numerical algorithm to handle spin. The comparison between the two algorithms shows that using FaStrip improves the accuracy of the estimated shear stress distribution and the creep force estimation in all studied cases. In combined lateral creepage and spin cases, for instance, the error in force estimation reduces from 18% to less than 2%. The estimation of the slip velocities in the slip zone, needed for wear analysis, is also studied. Since FaStrip is as fast as FASTSIM, it can be an alternative for tangential solution of the wheel–rail contact in simulation packages.

KW - creep curve

KW - FASTSIM

KW - rolling contact

KW - strip theory

KW - vehicle dynamics

KW - Wheel–rail contact

UR - http://www.scopus.com/inward/record.url?scp=84961226665&partnerID=8YFLogxK

U2 - 10.1080/00423114.2016.1156135

DO - 10.1080/00423114.2016.1156135

M3 - Article

VL - 54

SP - 748

EP - 764

JO - Vehicle System Dynamics

T2 - Vehicle System Dynamics

JF - Vehicle System Dynamics

SN - 0042-3114

IS - 6

ER -