EN 15610:2019/prA1

SLOVENSKI STANDARD
01-april-2024
Železniške naprave - Akustika - Merjenje hrapavosti (neravnin) vozne površine
tirnice in kolesa pri povzročanju hrupa
Railway applications - Acoustics - Rail and wheel roughness measurement related to
noise generation
Bahnanwendungen - Akustik - Messung der Schienen- und Radrauheit im Hinblick auf
die Entstehung von Rollgeräuschen
Applications ferroviaires - Acoustique - Mesurage de la rugosité des rails et des roues
relative à la génération du bruit de roulement
Ta slovenski standard je istoveten z: EN 15610:2019/prA1
ICS:
17.140.30 Emisija hrupa transportnih Noise emitted by means of
sredstev transport
45.080 Tračnice in železniški deli Rails and railway
components
93.100 Gradnja železnic Construction of railways
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

DRAFT
EUROPEAN STANDARD
EN 15610:2019
NORME EUROPÉENNE
EUROPÄISCHE NORM
prA1
January 2024
ICS 17.140.30; 93.100
English Version
Railway applications - Acoustics - Rail and wheel
roughness measurement related to noise generation
Applications ferroviaires - Acoustique - Mesurage de la Bahnanwendungen - Akustik - Messung der Schienen-
rugosité des rails et des roues relative à la génération und Radrauheit im Hinblick auf die Entstehung von
du bruit de roulement Rollgeräuschen
This draft amendment is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee CEN/TC 256.

This draft amendment A1, if approved, will modify the European Standard EN 15610:2019. If this draft becomes an amendment,
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for inclusion of
this amendment into the relevant national standard without any alteration.

This draft amendment was established by CEN in three official versions (English, French, German). A version in any other
language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC
Management Centre has the same status as the official versions.

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, Türkiye and
United Kingdom.
Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are
aware and to provide supporting documentation.

Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without
notice and shall not be referred to as a European Standard.

EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2024 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 15610:2019/prA1:2024 E
worldwide for CEN national Members.

Contents Page
European foreword . 3
1 Modification to Clause 3, Terms and definitions . 4
2 Modification to Clause 4, Symbols . 4
3 Modification to 5.1.2, Accuracy of the output signal . 4
4 Modification to 5.2.2.2, Localized geometric features . 5
5 Modification to 5.2.6, Acoustic roughness acquisition . 5
6 Addition of a new 5.2.7, Data quality checks. 5
7 Modification to 6.1.2, Accuracy of the output signal . 5
8 Modification to 6.2.4, Acoustic roughness acquisition . 5
9 Addition of a new Clause 7, Wheel roughness measurements for the assessment of
acoustic performance of brake blocks . 6
10 Addition of a new 8.3 (to the formerly Clause 7 that has been renumbered Clause 8),
Assessment of acoustic performance of brake blocks . 8
11 Modification of Clause 8, Presentation of the rail and wheel roughness spectra . 9
12 Modification of Clause 9, Report . 9
13 Modification of Annex A, Examples of geometrical features on the rail . 10
14 Modification of Annex D, Quantification of measurement uncertainties according to
ISO/IEC Guide 98-3 . 11
15 Addition of a new informative Annex F, Specific intervals during the brake
performance test program . 12
16 Modification of the Bibliography . 12

European foreword
This document (EN 15610:2019/prA1:2024) has been prepared by Technical Committee CEN/TC 256
“Railway applications”, the secretariat of which is held by DIN.
This document is currently submitted to the CEN enquiry.
This document will supersede EN 15610:2019.
EN 15610:2019:
• Addition of new procedure to assess the acoustic performance of brake blocks
This document has been prepared under a standardization request addressed to CEN by the European
Commission. The Standing Committee of the EFTA States subsequently approves these requests for its
Member States.
For the relationship with EU Legislation, see informative Annex ZA, which is an integral part of this
document.
1 Modification to Clause 3, Terms and definitions
Add the following definition as 3.15
3.15
brake block assessment indicator
I
cbb
the single value indicator describes the acoustic performance of brake blocks
2 Modification to Clause 4, Symbols
Replace the existing table by the following:
Symbol Meaning
C(x) circular curve used for the acoustic roughness processing
d position, relative to the outer surface of the rail head, of the longitudinal axis of symmetry
ref
of the reference surface
h height of a spike
I Single value indicator for acoustic brake block assessment
cbb
L Measured weighted transfer function [36]
h,weighted
L acoustic roughness level
r
L Weighted transfer function added to the energetic sum of the rail and wheel roughness
r,comb,weighted
L Measured rail roughness used as reference for the calculations [36]
r,ref,rail
L Wheel roughness spectrum in one-third octave band wavelength, determined for the
r,wheel
assessment of brake blocks
r(x) acoustic roughness

r()λ discrete Fourier Transform of r(x)

r'(x) acoustic roughness processed with the spike removal and curvature algorithm
W width of a spike
W width of the reference surface
ref
X variable of the distance along the rail
X particular position along the rail
i
Z mean value of height over a given interval
Λ Wavelength
3 Modification to 5.1.2, Accuracy of the output signal
Add the following paragraph in the end of the subclause
The permissible speed range for carrying out the measurements shall be stated by the manufacturer.
4 Modification to 5.2.2.2, Localized geometric features
Delete “localized” in the whole subclause (3 times in total: once in the title, once in the text and once in the
note).
5 Modification to 5.2.6, Acoustic roughness acquisition
Add the following sentence and the note in the end of the subclause:
The range of sensor moving speed defined by the manufacturer shall be kept.
NOTE The walking speed with trolley-based systems can affect the results. Additional measurements can be
taken to determine the influence of the walking speed. It is good practice to record the target speed.
6 Addition of a new 5.2.7, Data quality checks
Add a new 5.2.7 named “Data quality checks” with the following content:
Quality checks shall be made in order to ensure the accuracy of the measurements.
For the repeated measurements (minimum three measurements), the one-third octave band spectra shall
be compared. A maximum spread of 3 dB in any one-third octave band of all repeated measurements shall
be permissible.
Following the above operations, all the measurements shall be taken and all the data saved before being
processed.
7 Modification to 6.1.2, Accuracy of the output signal
Add the following sentence before the last paragraph of the subclause:
The permissible rotational speed range for carrying out the measurements shall be stated by the
manufacturer.
8 Modification to 6.2.4, Acoustic roughness acquisition
The subclause is modified as follows:
At least one full circumference of each line on each wheel shall be measured in a continuous record.
In addition, for at least one measurement on one of the wheels, three or more revolutions shall be
measured.
NOTE 1 This repeated measurement is for the purpose of data quality checking (6.2.5 b)).
The range of wheel rotational speed defined by the manufacturer shall be kept.
NOTE 2 The wheel rotational speed can affect the results. Additional measurements can be taken to determine
the influence of the wheel rotational speed. It is good practice to record the target speed.
9 Addition of a new Clause 7, Wheel roughness measurements for the
assessment of acoustic performance of brake blocks
Add a new Clause 7 and renumber the following clauses consequently:
7 Wheel roughness measurements for the assessment of acoustic performance of brake blocks
7.1 General
The purpose of this procedure is to assess the acoustic performance of a brake block.
NOTE The test sequences used on the test bench are defined for composite brake blocks. Application to other
types of brake blocks may require an adaption of the braking program.
7.2 Measuring system requirements
7.2.1 General
The measuring devices shall comply with the requirement of 6.1.
7.3 Data acquisition
7.3.1 General
The aim of the data acquisition procedure is to obtain digitized records of the acoustic roughness of the
wheel measured at a sufficiently high sampling rate (samples per unit length) over a whole
circumference, so that all the wavelengths associated with the wheel are covered down to the 3,15 mm
one-third octave band.
7.3.2 Data sampling
7.3.2.1 Sampling of a wheel at a test bench
The acoustic roughness of at least one wheel shall be measured.
Only new or reprofiled wheels shall be used. The wheels shall be free of any damage (cracks, flats, etc.).
The wheel diameter shall match the geometrical shape of the brake block.
NOTE The method described in 8.3 is validated for a nominal wheel diameter of 920 mm only.
The wheels shall be representative for the brake blocks under assessment.
New brake blocks shall be used.
The test bench shall comply with the IRS 50548, 2020 [33].
7.3.2.2 Brake performance test program
One of the following brake performance test programs shall be applied to at least one wheel:
• A2_a for LL-Blocks and A1_a for K-blocks of the specification referenced in UIC 541-4:2020 [37];
• D.1 for LL-Blocks and C.1 for K-blocks of the specification referenced in EN 16452:2015+A1:2019
[38]
• J.2 of the specification referenced in EN 16452:2015+A1:2019 [38] for other blocks.
It is recommended to perform several measurements of wheel roughness at specific intervals during the
brake performance test program in order to monitor the roughness development. Information about the
intervals can be found in Annex F.
The selected program shall be completed and the results of the measurement series after completion
shall be used to determine the wheel roughness indicator I .
cbb
7.3.2.3 Determination of the lateral positions at which to measure
The acoustic roughness of the wheel shall be assessed at three lateral positions 10 mm apart in the
contact surface between the brake block and the wheel. The middle line shall be in the middle of the brake
block.
Additional lines can be taken to gain more information of the transversal spread of the roughness. These
lines shall not be taken into account in the assessment procedure.
7.3.3 Test preparation
An additional construction is required to position and fixate the measurement device correctly at the
right angle to the wheel surface. It should be ensured that any lateral and vertical movements of the
device during the measurement is prevented to minimize drift in the data record.
While the roughness measurement is being carried out, all equipment of the test bench that could
influence the measurement by interfering vibrations should be switched off.
Before the tests are performed it is important to ensure that the wheel disc has cooled down sufficiently
so that it is in the validated working range of the measuring probe.
The wheel tread shall be checked for abnormalities or contamination. Any material residues or impurities
that could influence the measurement result or damage the roughness measurement device shall be
removed from the wheel tread.
7.3.4 Acoustic roughness acquisition
At least one
...