Verkkokauppa
SFS-EN 15302:2021:en
Railway applications. Wheel-rail contact geometry parameters. Definitions and methods for evaluation
Soveltamisala
Suomenkielistä soveltamisalaa ei ole saatavissa.
This document establishes definitions and evaluation methods for wheel-rail contact geometry parameters influencing the vehicle running dynamic behaviour:
- the rolling radius difference between the two wheels of a wheelset (?r-function) which serves as a basis for all further calculations;
- the equivalent conicity function from which are derived:
- a single equivalent conicity value for a specified amplitude which is relevant for the assessment of vehicle running stability on straight track and in very large radius curves according to EN 14363;
- the nonlinearity parameter which characterizes the shape of this function and is related to the vehicle behaviour particularly in the speed range close to the running stability limit;
- the rolling radii coefficient which is used to describe the theoretical radial steering capability of a wheelset in a curved track.
Additional information is given about the relationship between the contact angles of the two wheels of a wheelset (?tan?-function) and about the roll angle parameter.
NOTE Out of the presented parameters only those related to the contact angle are relevant for independently rotating wheels of wheel pairs.
Descriptions of possible calculation methods are included in this document. Test case calculations are provided to achieve comparable results and to check the proper implementation of the described algorithms.
To validate alternative methods not described in this document acceptance criteria are given for the equivalent conicity function. This includes reference profiles, profile combinations, tolerances and reference results with tolerance limits.
This document also includes minimum requirements for the measurement of wheel and rail profiles as well as of the parameters needed for the transformation into a common coordinate system of right- and left-hand profiles.
This document does not define limits for the wheel-rail contact geometry parameters and gives no tolerances for the rail profile and the wheel profile to achieve acceptable results.
For the application of this document some general recommendations are given.
Tämän julkaisun valmistelusta Suomessa vastaa Yhteinen Toimialaliitto, www.ytl.fi.
This document establishes definitions and evaluation methods for wheel-rail contact geometry parameters influencing the vehicle running dynamic behaviour:
- the rolling radius difference between the two wheels of a wheelset (?r-function) which serves as a basis for all further calculations;
- the equivalent conicity function from which are derived:
- a single equivalent conicity value for a specified amplitude which is relevant for the assessment of vehicle running stability on straight track and in very large radius curves according to EN 14363;
- the nonlinearity parameter which characterizes the shape of this function and is related to the vehicle behaviour particularly in the speed range close to the running stability limit;
- the rolling radii coefficient which is used to describe the theoretical radial steering capability of a wheelset in a curved track.
Additional information is given about the relationship between the contact angles of the two wheels of a wheelset (?tan?-function) and about the roll angle parameter.
NOTE Out of the presented parameters only those related to the contact angle are relevant for independently rotating wheels of wheel pairs.
Descriptions of possible calculation methods are included in this document. Test case calculations are provided to achieve comparable results and to check the proper implementation of the described algorithms.
To validate alternative methods not described in this document acceptance criteria are given for the equivalent conicity function. This includes reference profiles, profile combinations, tolerances and reference results with tolerance limits.
This document also includes minimum requirements for the measurement of wheel and rail profiles as well as of the parameters needed for the transformation into a common coordinate system of right- and left-hand profiles.
This document does not define limits for the wheel-rail contact geometry parameters and gives no tolerances for the rail profile and the wheel profile to achieve acceptable results.
For the application of this document some general recommendations are given.
Tämän julkaisun valmistelusta Suomessa vastaa Yhteinen Toimialaliitto, www.ytl.fi.
Sidokset
Velvoittavat viittaukset
EN 13231-2:2020 Railway applications - Track - Acceptance of works - Part 2: Acceptance of reprofiling rails in plain line, switches, crossings and expansion devices
Tekninen komitea
Vahvistuspäivä
15.10.2021
Julkaisupäivä
19.10.2021
Painos
3
Sivumäärä
110
Julkaisun kieli
englanti