### Abstract

This paper discusses the calculation of the equivalent conicity for railway wheel and rail profile, particularly the assumption that the radius of a curve can be neglected during the calculation. A simple Matlab program shows that the curve radius term can have an influence on the calculated equivalent conicity, and highlights the importance of defining a limit radius at which equivalent conicity cannot be used as a reliable measure of stability. The work is also supported by vehicle dynamics simulation and a methodology is proposed to show the relationship between dynamics oscillation forces and quasi-static curving forces as a function of curve radius, cant deficiency and vehicle speed. The current limit of 2500m based on EN14363 definition of very large radius curve is proved to be a sensible limit, however results from low speed freight traffic show that dynamic oscillation can also be an issue in tighter radius curve.

Original language | English |
---|---|

Article number | 55 |

Journal | Civil-Comp Proceedings |

Volume | 98 |

DOIs | |

Publication status | Published - 2012 |

Externally published | Yes |

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### Cite this

*Civil-Comp Proceedings*,

*98*, [55]. https://doi.org/10.4203/ccp.98.55

}

*Civil-Comp Proceedings*, vol. 98, 55. https://doi.org/10.4203/ccp.98.55

**The assessment of railway track conicity and the question of limit radius.** / Bezin, Y.; Alonso, A.

Research output: Contribution to journal › Article

TY - JOUR

T1 - The assessment of railway track conicity and the question of limit radius

AU - Bezin, Y.

AU - Alonso, A.

PY - 2012

Y1 - 2012

N2 - This paper discusses the calculation of the equivalent conicity for railway wheel and rail profile, particularly the assumption that the radius of a curve can be neglected during the calculation. A simple Matlab program shows that the curve radius term can have an influence on the calculated equivalent conicity, and highlights the importance of defining a limit radius at which equivalent conicity cannot be used as a reliable measure of stability. The work is also supported by vehicle dynamics simulation and a methodology is proposed to show the relationship between dynamics oscillation forces and quasi-static curving forces as a function of curve radius, cant deficiency and vehicle speed. The current limit of 2500m based on EN14363 definition of very large radius curve is proved to be a sensible limit, however results from low speed freight traffic show that dynamic oscillation can also be an issue in tighter radius curve.

AB - This paper discusses the calculation of the equivalent conicity for railway wheel and rail profile, particularly the assumption that the radius of a curve can be neglected during the calculation. A simple Matlab program shows that the curve radius term can have an influence on the calculated equivalent conicity, and highlights the importance of defining a limit radius at which equivalent conicity cannot be used as a reliable measure of stability. The work is also supported by vehicle dynamics simulation and a methodology is proposed to show the relationship between dynamics oscillation forces and quasi-static curving forces as a function of curve radius, cant deficiency and vehicle speed. The current limit of 2500m based on EN14363 definition of very large radius curve is proved to be a sensible limit, however results from low speed freight traffic show that dynamic oscillation can also be an issue in tighter radius curve.

KW - Equivalent conicity

KW - Hunting

KW - Radial steering index

KW - Stability

KW - Track forces

KW - Vehicle dynamics

UR - http://www.scopus.com/inward/record.url?scp=85068463354&partnerID=8YFLogxK

U2 - 10.4203/ccp.98.55

DO - 10.4203/ccp.98.55

M3 - Article

VL - 98

JO - Civil-Comp Proceedings

JF - Civil-Comp Proceedings

SN - 1759-3433

M1 - 55

ER -