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CEN/TR 17792:2022

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Railway Applications - Wheel-rail contact geometry parameters - Technical report and background information about EN 15302

Railway Applications - Wheel-rail contact geometry parameters - Technical report and background information about EN 15302

This document provides background information regarding the changes from EN 15302:2008+A1:2010 to the revised version dated 2021, including the reasons for decisions and additional explanation and guidance that is not appropriate in the standard.
The range of equivalent conicity results obtained with different software tools is described. The additional wheel-rail contact parameters, rolling radii coefficient and nonlinearity parameter, are explained. More information is also provided on the different calculation methods and the updated reference profiles for the assessment. The influence of simplifications used in determination of equivalent conicity is discussed.
To provide more information on the importance of considering the complete measurement and calculation process, methods for plausibility checks, eliminating outliers and assessing the uncertainty and repeatability of measurements are included as well as assessments of the smoothing process.
Guidance is given on fields of application of the wheel-rail contact parameters, on the selection of appropriate reference profiles (choice of reference rail profile and rail inclination for assessing wheel profiles and vice versa) and on handling special cases.
As some references in EN 14363 to wheel-rail contact test conditions have caused difficulties in understanding, clarifications issued by ERA are mentioned.
Interpretation of equivalent conicity results, using tools such as conicity maps, is discussed and various approximations such as ‘quick conicity’ assessments are also described.
Information is included on possible additional wheel-rail contact parameters, not yet ready for standardization, but where further experience is needed.
NOTE   In this document the commonly used term “wheel-rail contact geometry” is used as a synonym for the more precise term “wheelset-track contact geometry”.

Bahnanwendungen - Rad-Schiene-Berührgeometrieparameter - Technischer Bericht und Hintergrundinformationen zur EN 15302

Applications ferroviaires - Paramètres géométriques du contact roue-rail - Rapport technique et informations générales sur l’EN 15302:2021

Železniške naprave - Geometrijski parametri stika kolo-tirnica - Tehnično poročilo in temeljne informacije o standardu EN 15302

To tehnično poročilo vsebuje temeljne informacije v zvezi s spremembami iz standarda EN 15302:2008+A1:2010 v revidirani različici iz leta 2021, vključno z razlogi za odločitve ter dodatnim pojasnilom in smernicami, ki v standardu niso primerni.
Opisan je razpon rezultatov ekvivalentne konicitete, pridobljenih z različnimi programskimi orodji. Pojasnjeni so dodatni parametri stika kolo-tirnica, koeficient kotalnega radija in parameter nelinearnosti. Podane so tudi dodatne informacije o različnih računskih metodah in posodobljenih referenčnih profilih za ocenjevanje. Obravnavan je vpliv poenostavitev, uporabljenih pri določanju ekvivalentne konicitete.
Za zagotovitev dodatnih informacij v zvezi s tem, kako pomembno je upoštevati celoten postopek merjenja in izračuna, so vključene metode za preverjanje verodostojnosti, odpravljanje osamelcev ter ocenjevanje negotovosti in ponovljivosti meritev, vključno z ocenami postopka izravnave.
Podane so smernice o področjih uporabe parametrov stika kolo-tirnica, o izbiri ustreznih referenčnih profilov (izbira referenčnega profila tirnice in nagiba tirnice za ocenjevanje profilov koles oz. obratno) ter o obravnavi posebnih primerov.
Ker so nekateri sklici na preskusne pogoje stika kolo-tirnica v standardu EN 14363 povzročili težave pri razumevanju, so navedena pojasnila, ki jih je izdala Evropska agencija za železniški promet (ERA).
Obravnavana je interpretacija rezultatov ekvivalentne konicitete z uporabo orodij, kot so zemljevidi konicitete, opisani pa so tudi različni približki, kot so ocene »hitre konicitete«.
Vključene so informacije o morebitnih dodatnih parametrih stika kolo-tirnica, ki še niso pripravljeni za standardizacijo, vendar so v zvezi s tem potrebne dodatne izkušnje.
OPOMBA:   Splošno uporabljen izraz »geometrija stika kolo-tirnica« se v tem dokumentu uporablja kot sopomenka za natančnejši izraz »geometrija stika kolesna dvojica-tirnica«.

General Information

Status
Published
Publication Date
08-Feb-2022
ICS
17.040.20 - Properties of surfaces
45.060.01 - Railway rolling stock in general
Technical Committee
CEN/TC 256 - Railway applications
Drafting Committee
CEN/TC 256/WG 10 - Vehicle/Track Interaction
Current Stage
6060 - Definitive text made available (DAV) - Publishing
Start Date
09-Feb-2022
Due Date
03-Feb-2022
Completion Date
09-Feb-2022
Directive
2008/57/EC - Directive 2008/57/EC of the European Parliament and of the Council of 17 June 2008 on the interoperability of the rail system within the Community (Recast)
Mandate
M/483 - Mandate for programming and standardisation addressed to the European standardisation bodies under directive 2008/57/EC in the field of the interoperability of the rail system within the European Union
Ref Project
SIST-TP CEN/TR 17792:2022 - Railway Applications - Wheel-rail contact geometry parameters - Technical report and background information about EN 15302

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SLOVENSKI STANDARD
SIST-TP CEN/TR 17792:2022
01-april-2022
Železniške naprave - Geometrijski parametri stika kolo-tirnica - Tehnično poročilo
in temeljne informacije o standardu EN 15302
Railway Applications - Wheel-rail contact geometry parameters - Technical report and
background information about EN 15302
Bahnanwendungen - Rad-Schiene-Berührgeometrieparameter - Technischer Bericht und
Hintergrundinformationen zur EN 15302
Applications ferroviaires - Paramètres géométriques du contact roue-rail - Rapport
technique et informations générales sur l’EN 15302:2021
Ta slovenski standard je istoveten z: CEN/TR 17792:2022
ICS:
45.060.01 Železniška vozila na splošno Railway rolling stock in
general
SIST-TP CEN/TR 17792:2022 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST-TP CEN/TR 17792:2022

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SIST-TP CEN/TR 17792:2022


CEN/TR 17792
TECHNICAL REPORT

RAPPORT TECHNIQUE

February 2022
TECHNISCHER BERICHT
ICS 17.040.20; 45.060.01
English Version

Railway Applications - Wheel-rail contact geometry
parameters - Technical report and background
information about EN 15302
Applications ferroviaires - Paramètres géométriques Bahnanwendungen - Rad-Schiene-
du contact roue-rail - Rapport technique et Berührgeometrieparameter - Technischer Bericht und
informations générales sur l'EN 15302:2021 Hintergrundinformationen zur EN 15302


This Technical Report was approved by CEN on 10 January 2022. It has been drawn up by the Technical Committee CEN/TC 256.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and
United Kingdom.





EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2022 CEN All rights of exploitation in any form and by any means reserved Ref. No. CEN/TR 17792:2022 E
worldwide for CEN national Members.

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SIST-TP CEN/TR 17792:2022
CEN/TR 17792:2022 (E)
Contents Page
European foreword . 4
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 5
4 Overview of the most important changes made to EN 15302 . 6
4.1 List of main changes . 6
4.2 Additional wheel-rail contact geometry parameters . 6
4.2.1 Rolling radii coefficient . 6
4.2.2 Nonlinearity parameter . 6
4.3 Methods for evaluation of equivalent conicity . 7
4.4 Assessment of the smoothing process . 7
4.5 New assessment of the complete process . 8
5 Technical background to and justification of changes in the revised EN 15302 . 8
5.1 Equivalent conicity . 8
5.1.1 Review of equivalent conicity results obtained with different software tools . 8
5.1.2 Comparison with multibody system simulation results .11
5.1.3 Influence of discretisation step size of the rolling radius difference function .14
5.2 Rolling radii coefficient .15
5.2.1 Background .
...

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