Railway applications - Acoustics - Measuring of door audible warnings

This European standard describes the type test assessment method for acoustic signals at passenger external doors applying to rolling stock. The following applies to this standard: - this standard refers to acoustical passenger information indicating the release, opening and closing of passenger doors; - this standard is applicable to tonal signals with defined frequency components; - this standard is not applicable to spoken information.
NOTE 1   Acoustic door signals in terms of TSI compliance are defined in EN 16584-2 "Design for PRM use".
NOTE 2   Acoustic doors signals in terms of door system function are described in EN 14752.

Bahnanwendung - Akustik - Messung akustischer Türsignale von Eisenbahnfahrzeugen

Dieses Dokument beschreibt das Bewertungsverfahren für die Typprüfung akustischer Warnsignale für Fahrgast-Außentüren, das für Schienenfahrzeuge gilt. Für diese Norm gilt Folgendes:
— dieses Dokument bezieht sich auf akustische Fahrgastinformationen, die auf das Entriegeln, Öffnen und Schließen von Fahrgasttüren hinweisen;
— dieses Dokument gilt für Tonsignale mit festgelegten Frequenzkomponenten;
— dieses Dokument gilt nicht für gesprochene Informationen.
ANMERKUNG 1 Akustische Türsignale in Bezug auf die TSI-Konformität sind in EN 16584-2 „Gestaltung für die Nutzung durch PRM“ festgelegt.
ANMERKUNG 2 Akustische Türsignale in Bezug auf die Funktion des Türsystems sind in EN 14752 beschrieben.

Application ferroviaires - Acoustique - Mesurage des signaux audibles d’avertissement des portes

Le présent document décrit la méthode d'évaluation d'un essai de type pour les signaux acoustiques des portes extérieures de voitures voyageurs applicables au matériel roulant. Les éléments suivants s'appliquent à la présente norme :
- le présent document se rapporte aux informations acoustiques de voyageurs indiquant le
déverrouillage, l'ouverture et la fermeture des portes de voitures voyageurs ;
- le présent document s'applique aux signaux tonaux avec des composants de fréquence définie ;
- le présent document ne s'applique pas aux informations vocales.
NOTE 1 En ce qui concerne la conformité à la STI, les signaux acoustiques des portes sont définis dans l'EN 16584-2, « Conception destinée à l'usage par les PMR ».
NOTE 2 Les signaux acoustiques des portes du point de vue du fonctionnement du système de portes sont décrits dans l'EN 14752.

Železniške naprave - Akustika - Merjenje zvočnih opozoril pri vratih

General Information

Status
Published
Public Enquiry End Date
14-Nov-2018
Publication Date
13-Aug-2020
Technical Committee
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
13-Aug-2020
Due Date
18-Oct-2020
Completion Date
14-Aug-2020

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SLOVENSKI STANDARD
SIST EN 17285:2020
01-oktober-2020
Železniške naprave - Akustika - Merjenje zvočnih opozoril pri vratih
Railway applications - Acoustics - Measuring of door audible warnings
Bahnanwendung - Akustik - Messung akustischer Türsignale von Eisenbahnfahrzeugen
Application ferroviaires - Acoustique - Mesurage des signaux audibles d’avertissement
des portes
Ta slovenski standard je istoveten z: EN 17285:2020
ICS:
17.140.30 Emisija hrupa transportnih Noise emitted by means of
sredstev transport
45.060.20 Železniški vagoni Trailing stock
SIST EN 17285:2020 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 17285:2020

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SIST EN 17285:2020


EN 17285
EUROPEAN STANDARD

NORME EUROPÉENNE

August 2020
EUROPÄISCHE NORM
ICS 17.140.30; 45.060.20
English Version

Railway applications - Acoustics - Measuring of door
audible warnings
Application ferroviaires - Acoustique - Mesurage des Bahnanwendung - Akustik - Messung akustischer
signaux audibles d'avertissement des portes Türsignale von Eisenbahnfahrzeugen
This European Standard was approved by CEN on 29 June 2020.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this
European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN
member.

This European Standard exists 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, 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
© 2020 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 17285:2020 E
worldwide for CEN national Members.

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SIST EN 17285:2020
EN 17285:2020 (E)
Contents Page
European foreword . 4
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 5
4 Symbols and abbreviations . 6
5 Instrumentation and calibration . 6
5.1 Instrumentation . 6
5.2 Calibration . 6
6 Interior tests . 6
6.1 Enumeration of vestibule types . 6
6.2 Environmental conditions . 8
6.3 Vehicle conditions . 8
6.4 Measured quantities . 8
6.5 Measurement procedure . 8
6.5.1 General . 8
6.5.2 Measurement positions for measurements in the vehicle . 8
6.5.3 Sound pressure level measurement and duration of the signal . 9
6.5.4 Pulse rate measurement . 10
6.5.5 Frequency properties of the signal . 10
6.5.6 Tonal prominence assessment . 10
7 Exterior tests. 11
7.1 General . 11
7.2 Environmental conditions . 11
7.3 Vehicle conditions . 11
7.4 Measured quantities . 11
7.5 Test procedure . 11
7.5.1 General . 11
7.5.2 Measurement positions for exterior tests . 11
7.5.3 Sound pressure level measurement and duration of the signal . 12
7.5.4 Pulse rate measurement . 12
7.5.5 Frequency properties of the signal . 12
7.5.6 Tonal prominence assessment . 13
8 Test report . 13
Annex A (normative) Tonal prominence assessment . 14
A.1 General . 14
A.2 Method . 14
Annex B (normative) Test for an adaptive-level door warning . 15
B.1 General . 15
B.1.1 Introduction . 15
B.1.2 Scope . 15
2

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SIST EN 17285:2020
EN 17285:2020 (E)
B.1.3 Approach . 15
B.2 Quantities specific to this annex . 15
B.3 Instrumentation . 17
B.4 Environmental and vehicle conditions . 17
B.5 Measurement positions and data sampling . 17
B.6 ‘Background’ noise to be generated for the test . 17
B.7 Procedure . 18
B.8 Reporting requirements . 20
B.9 Examples . 20
B.9.1 General . 20
B.9.2 Example 1 . 21
B.9.2.1 Description . 21
B.9.2.2 Procedure . 22
B.9.3 Example 2 . 25
B.9.3.1 Description . 25
B.9.3.2 Procedure . 26
B.9.4 Example 3 . 28
B.9.4.1 Description . 28
B.9.4.2 Procedure . 29
Annex C (normative) Laboratory tests . 32
C.1 General . 32
C.2 Mounting arrangements. 32
C.3 Modes of operation . 32
C.4 Instrumentation . 32
C.5 Background noise level . 33
C.6 Pulse rate estimation . 33
C.7 Frequency analysis . 33
C.8 Measurement of sound pressure level . 33
Bibliography . 36

3

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SIST EN 17285:2020
EN 17285:2020 (E)
European foreword
This document (EN 17285:2020) has been prepared by Technical Committee CEN/TC 256 “Railway
applications”, the secretariat of which is held by DIN.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by February 2021, and conflicting national standards shall
be withdrawn at the latest by February 2021.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
According to the CEN-CENELEC Internal Regulations, the national standards organisations of the
following countries are bound to implement this European Standard: 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 the United
Kingdom.
4

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SIST EN 17285:2020
EN 17285:2020 (E)
1 Scope
This document specifies procedures to assess acoustic signals at passenger external doors applying to all
kind of rolling stock. The following applies to this standard:
— this document refers to acoustical passenger information indicating the release, opening and closing
of passenger doors;
— this document is applicable to tonal signals with defined frequency components levels and pulse
sequences;
— this document is not applicable to spoken information or to signals comprising a sequence of
impulses (such as a door finding signal).
NOTE Acoustic door signals are defined in EN 16584-2 “Design for PRM use”.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
EN IEC 60942, Electroacoustics — Sound calibrators
EN 61260 (series), Electroacoustics — Octave-band and fractional-octave-band filters
EN 61672-1, Electroacoustics — Sound level meters — Part 1: Specifications
EN 61672-2, Electroacoustics — Sound level meters — Part 2: Pattern evaluation tests
ISO 266, Acoustics — Preferred frequencies
ISO 1996-2:2017, Acoustics — Description, measurement and assessment of environmental noise — Part 2:
Determination of sound pressure levels
3 Terms and definitions
No terms and definitions are listed in this document.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at https://www.iso.org/obp/ui
5

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SIST EN 17285:2020
EN 17285:2020 (E)
4 Symbols and abbreviations
RMS sum The sum of the root mean squares of sound pressures
LL L
 
p1 p2 pi
 
10 10 10
RMS sum 10lg 10+ 10++. 10 dB
 
 
 
Where L , L , … L are a set of sound pressure levels
p1 p2 pi
RMS average average of the root mean square of sound pressures

L
 
p1 Lp2 LNp
 
10 10 10
10 + 10 ++. 10
 
RMS average = 10lg dB
 
N
 
 
Where LL, . L are a set of sound pressure levels
p1 p2 pN
5 Instrumentation and calibration
5.1 Instrumentation
Each component of the instrumentation system shall meet the requirements for a class 1 instrument
specified in EN 61672-1.
The sound calibrator shall meet the requirements of class 1 according to EN IEC 60942.
Microphones with free-field characteristics shall be used. A suitable microphone windscreen may be
used.
Where one-third octave frequency band analysis is required, the filters shall meet the requirements of
class 1, according to EN 61260.
The compliance of the calibrator with the requirements of EN IEC 60942 shall be verified at least once a
year. The compliance of the instrumentation system with the requirements of EN 61672-1 and
EN 61672-2 shall be verified at least every 2 years. The date of the last verification of the compliance with
the relevant European Standards shall be recorded.
5.2 Calibration
Before and after each series of measurements a sound calibrator meeting the requirements of class 1
according to EN IEC 60942 shall be applied to the microphone(s) for verifying the calibration of the entire
measuring system at one or more frequencies over the frequency range of interest. If the difference
between the two calibrations is more than 0,5 dB all the measurement results in between shall be
rejected.
6 Interior tests
6.1 Enumeration of vestibule types
All the vestibules of a vehicle shall be classified into a number of vestibule types. The list of vestibule
types is to be determined before measurements take place. For this purpose, the wavelength of sound in
air at the lowest primary tone of the audible warning signal, λ , shall be calculated.
c
6
=

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SIST EN 17285:2020
EN 17285:2020 (E)
To make the list, vestibule types shall be distinguished on the basis of any one, or combination of, the
following features.
a) Vestibules with single-panel or double-panel exterior doors are different types.
b) Regarding any solid wall, panel or partition adjacent to the body-side entrance doors that form the
vestibule area, their acoustic effect as ‘barriers’ (influencing the sound propagation) shall be
considered.
— A vestibule may have barriers or partial barriers on either side. Such a barrier is only considered
if it is immediately adjacent to the body-side door(s).
— A partial barrier is distinct from a full barrier if there is an opening in it for passenger access
(aisle).
— Two panels either side of an aisle shall be considered to constitute one partial barrier.
— Any internal door shall be considered closed.
— Any panel or wall not extending further than λc from the interior side walls surface in the main
passenger accommodation area of the vehicle shall not be considered.
— Any panel or wall extending no higher than the 1,2m shall not be considered.
A vestibule type can therefore have 0, 1 or 2 barriers, each of which can be full or partial. No other
property of the barrier than ‘full’ or ‘partial’ shall be considered.
c) A difference in the mounting of the sounder to the vehicle structure will cause a change in the point
mechanical impedance of the structure. Such a difference might be between a mounting mid-panel
or close to any structural component that would act as a stiffener.
d) The sounder location changes according to the following criteria.
The height above the floor changes by more than 30 cm,
The sounder location lies within or outside a distance of λ /4 from a junction of floor, ceiling or panel
c
surfaces. There are two separate cases of such a junction,
— it is mounted close to two surfaces or,
— it is mounted close to three surfaces.
No other criteria shall be used as they affect the sound pressure level less significantly.
A difference between vestibules in any of these features shall cause a new vestibule type to be added to
the list of types.
7

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SIST EN 17285:2020
EN 17285:2020 (E)
6.2 Environmental conditions
The door opening of the vehicle shall be at least 5 m away from reflecting walls or roof of any building.
There are no requirements on the external ground conditions or ground height.
Care shall be taken to ensure that noise from other sources, e.g. other vehicles or industrial plants and
due to external wind, does not influence the measurements significantly.
For fixed-level sounders, the background noise level L measured over T = 20 s of each measurement
pAeq,T
position shall be at least 10 dB below the level of the warning signal (L , L and, possibly, L ,
pAF pAFmax pAeq,T
see 6.4).
For adaptive-level sounders, the effective background noise is controlled under the measurement
procedure itself – see Annex B.
6.3 Vehicle conditions
The unit shall be at standstill.
Surfaces shall present their normal operational acoustic properties.
As long as the background noise level requirement in 6.2 is fulfilled, any operational condition of auxiliary
equipment shall be accepted.
6.4 Measured quantities
The measured acoustic quantities are L , L and, if required, L , with T as time of the sounder
pAF pAFmax pAeq,T
event duration. For the assessment of tones, narrow band frequency analysis shall be applied.
NOTE Such a requirement is generally specified by legislation or contract.
6.5 Measurement procedure
6.5.1 General
Separate procedures are defined below for measuring: the sound pressure level of the signal in the
vehicle, the duration of the signal, the pulse rate and the frequency content. The first of these procedures,
described in 6.5.3, shall be carried out in situ in the vehicle. The pulse rate (6.5.4) and frequency content
(6.5.5) may alternatively be determined from measurements made of the door sounder component
separately under prescribed laboratory conditions – see Annex C.
6.5.2 Measurement positions for measurements in the vehicle
For the interior tests two alternative microphone arrangements are allowed.
Arrangement 1 (preferred): A single microphone shall be located so as to maximize the measured sound
pressure level within the volume defined at the height of 1,5 m (±0,1 m) above the vehicle floor and
anywhere within a lateral distance of 0,25 m from a point on the mid-plane of the vestibule normal to the
centre-line of the door opening. That is, within the cylindrical volume indicated in Figure 1.
8

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SIST EN 17285:2020
EN 17285:2020 (E)

Key
1 mid way between the doors
2 height: 1,5 m
3 lateral distance: 0,25 m
4 range: ± 0,1 m
5 door openings
Figure 1 — Arrangement 1 with one microphone
Arrangement 2: Eight microphones shall be equally distributed in a circle of radius 0,25 m about a point
1,5 m in height above the vehicle floor and opposite the centre of the door opening and in the vertical
mid-plane of the vehicle. Measurements shall be made (1) for the circle in the horizontal orientation and
(2) for the circle in any vertical orientation.
6.5.3 Sound pressure level measurement and duration of the signal
For fixed level sounders, the whole of the following procedure shall be followed. For adaptive level
sounders the procedure shall be used only to measure the timing, pulse-rates and frequencies.
In a case of an adaptive level device, a measurement shall be carried out to ensure that the sounder level
is adapted to the ambient noise level. The measuring procedure for adaptive door sound devices is
described in Annex B.
For at least one measurement position the time history of L shall be produced for the whole door
pAF
opening signal and for the whole door closing signal. This shall be used to determine the timing and
duration of this time history in relation to the time at which the door operation was initiated.
9

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SIST EN 17285:2020
EN 17285:2020 (E)
For all measurement positions the following shall be produced while the door is stationary (fully open,
fully closed). The noise of the operation of the door itself is thereby omitted from the following results:
a) L for the door opening signal taken from the part of the signal with the door closed;
pAFmax
b) L for the door closing signal taken from the part of the signal with the door open;
pAFmax
c) If required, the L shall also be evaluated, where T is 5 pulses of the signal taken from the part of
pAeq,T
the signal with the door closed.
NOTE Such a requirement is generally specified by legislation or contract.
For microphone arrangement 2, the results of a), b) and c) shall be the RMS average over all the
microphone positions.
The results of a), b) and c) shall be used as the result for the measurement over the total duration of the
sound event. This method excludes contamination by noise generated by the door mechanism.
The requirements can involve testing the door for each of the cases in which the door is actuated and not
actuated.
6.5.4 Pulse rate measurement
This test may be performed on sound pressure measurements made on the door sounder component in
a suitable environment other than the vehicle (see Annex C).
To count the number of pulses per second a visual representation of the pulsing of the sounder noise shall
be produced.
NOTE A time history plot of LpAeq,T where T is 10 ms will present a clear pulse up to 10 pulses per second. A
plot of LAF will not. Alternatively, a spectrogram with a sufficient time resolution can be produced by many software
packages. This has been found to provide a clear representation of pulse count.
6.5.5 Frequency properties of the signal
This test may be performed on sound pressure measurements made on the door sounder component in
a suitable environment other than the vehicle (see Annex C).
To determine the frequency of tones within the signal a narrow band power spectrum shall be produced
that has a resolution of up to 20 Hz.
NOTE The frequency can also be found in a spectrogram produced for the purpose of pulse rate estimation in
6.5.4.
6.5.6 Tonal prominence assessment
If required, an assessment of the relative audibility of different tones shall be carried out as described in
Annex A.
NOTE Such a requirement is generally specified by legislation or contract.
10

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SIST EN 17285:2020
EN 17285:2020 (E)
7 Exterior tests
7.1 General
The test shall be carried out at one entrance door of the unit. If required, two additional measurements
shall be carried out at other entrance door locations.
7.2 Environmental conditions
The door opening of the vehicle shall be at least 5 m away from reflecting walls or roof of any building.
There are no requirements on the external ground conditions or ground height (with or without
platform).
Care shall be taken to ensure that the noise from other sources, e.g. other vehicles or industrial plants and
due to external wind, does not influence the measurements significantly.
For fixed-level sounders, the background noise level L measured over T = 20 s of each measurement
pAeq,T
position shall be at least 10 dB below the level of the warning signal (L , L and, possibly, L ,
pAF pAFmax pAeq,T
see 7.4).
For adaptive-level sounders, the effective background noise is controlled under the measurement
procedure itself – see Annex B.
7.3 Vehicle conditions
The unit shall be at standstill.
As long as the background noise level requirement in 7.2 is fulfilled, any operational condition of auxiliary
equipment shall be accepted.
Wherever equipment of the unit under test exceeds the background noise requirement it is permissible
to switch off the noise emitting components.
7.4 Measured quantities
The measured acoustic quantities are L , L and, if required, L , with T as time of the sounder
pAF pAFmax pAeq,T
event duration. For the assessment of tones, narrow band frequency analysis shall be applied.
NOTE Such a requirement is generally specified by legislation or contract.
7.5 Test procedure
7.5.1 General
Separate procedures are defined below for measuring the sound pressure level of the signal outside the
vehicle, the duration of the signal, the pulse rate and the frequency content. The procedures described in
7.5.3 shall be carried ou
...

SLOVENSKI STANDARD
oSIST prEN 17285:2018
01-november-2018
äHOH]QLãNHQDSUDYH$NXVWLND0HUMHQMH]YRþQLKRSR]RULOSULYUDWLK
Railway applications - Acoustics - Measuring of door audible warnings
Bahnanwendung - Akustik - Messung akustischer Türsignale von Eisenbahnfahrzeugen
Application ferroviaires - Acoustique - Mesurage des signaux audibles d’avertissement
des portes
Ta slovenski standard je istoveten z: prEN 17285
ICS:
17.140.30 Emisija hrupa transportnih Noise emitted by means of
sredstev transport
45.060.20 Železniški vagoni Trailing stock
oSIST prEN 17285:2018 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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oSIST prEN 17285:2018

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oSIST prEN 17285:2018


DRAFT
EUROPEAN STANDARD
prEN 17285
NORME EUROPÉENNE

EUROPÄISCHE NORM

August 2018
ICS 17.140.30; 45.060.20
English Version

Railway applications - Acoustics - Measuring of door
audible warnings
Application ferroviaires - Acoustique - Mesurage des Bahnanwendung - Akustik - Messung akustischer
signaux audibles d'avertissement des portes Türsignale von Eisenbahnfahrzeugen
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee
CEN/TC 256.

If this draft becomes a European Standard, CEN members are bound to comply with the CEN/CENELEC Internal Regulations
which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.

This draft European Standard 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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey 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
© 2018 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 17285:2018 E
worldwide for CEN national Members.

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oSIST prEN 17285:2018
prEN 17285:2018 (E)
Contents Page
European foreword . 4
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 5
4 Symbols and abbreviations . 8
5 Instrumentation and calibration . 8
5.1 Instrumentation . 8
5.2 Calibration . 8
6 Interior tests . 8
6.1 General . 8
6.2 Environmental conditions . 9
6.3 Vehicle conditions . 9
6.4 Measured quantities . 9
6.5 Measurement procedure . 9
6.5.1 General . 9
6.5.2 Microphone positions for measurements in the vehicle . 9
6.5.3 Sound pressure level estimation and duration of the signal . 10
6.5.4 Pulse rate estimation . 11
6.5.5 Frequency analysis . 11
6.5.6 Tonal prominence assessment . 11
7 Exterior tests. 11
7.1 General . 11
7.2 Environmental conditions . 11
7.3 Vehicle conditions . 12
7.4 Measured quantities . 12
7.5 Test procedure . 12
7.5.1 General . 12
7.5.2 Microphone positions for exterior tests . 12
7.5.3 Sound pressure level estimation and duration of the signal . 12
7.5.4 Pulse rate estimation . 13
7.5.5 Frequency analysis . 13
7.5.6 Tonal prominence assessment . 13
8 Test report . 13
Annex A (informative) Tonal prominence assessment . 15
A.1 General . 15
A.2 Detailed method . 15
Annex B (normative) Test for an adaptive-level door warning . 16
B.1 General . 16
B.1.1 Introduction . 16
B.1.2 Scope . 16
2

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oSIST prEN 17285:2018
prEN 17285:2018 (E)
B.1.3 Approach . 16
B.2 Definitions . 16
B.3 Instrumentation . 18
B.4 Environmental and vehicle conditions . 18
B.5 ‘Background’ noise to be generated for the test . 18
B.6 Measurement locations and sampling . 19
B.7 Procedure . 19
B.8 Reporting requirements . 21
B.9 Examples (informative) . 21
B.9.1 General . 21
B.9.2 Example 1 . 22
B.9.2.1 Example 1 description . 22
B.9.2.2 Example 1 procedure . 23
B.9.3 Example 2 . 26
B.9.3.1 Example 2 description . 26
B.9.3.2 Example 2 procedure . 27
B.9.4 Example 3 . 30
B.9.4.1 Example 3 description . 30
B.9.4.2 Example 3 procedure . 31
Annex C (informative) Laboratory tests . 34
C.1 General . 34
C.2 Mounting arrangements. 34
C.3 Modes of operation . 34
C.4 Instrumentation . 34
C.5 Background noise level . 35
C.6 Pulse rate estimation . 35
C.7 Frequency analysis . 35
C.8 Measurement of sound pressure level . 35
Bibliography . 38
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European foreword
This document (prEN 17285:2018) 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.
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1 Scope
This document describes the type test assessment method for acoustic signals at passenger external
doors applying to rolling stock. The following applies to this standard:
— this document refers to acoustical passenger information indicating the release, opening and
closing of passenger doors;
— this document is applicable to tonal signals with defined frequency components;
— this document is not applicable to spoken information.
NOTE 1 Acoustic door signals in terms of TSI compliance are defined in EN 16584-2 “Design for PRM use”.
NOTE 2 Acoustic doors signals in terms of door system function are described in EN 14752.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
IEC 60942, Electroacoustics — Sound calibrators
IEC 61260, Electroacoustics — Octave-band and fractional-octave-band filters
IEC 61672-1:2002, Electroacoustics — Sound level meters — Part 1: Specifications
IEC 61672-2:2003, Electroacoustics — Sound level meters — Part 2: Pattern evaluation tests
ISO 1996-2:2007, Acoustics — Description, measurement and assessment of environmental noise —
Part 2: Determination of sound pressure levels
ISO 266, Acoustics — Preferred frequencies
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
3.1
sound pressure
p
root mean square (RMS) value of a fluctuating pressure superimposed on the static atmospheric
pressure measured over a certain time-period, expressed in Pa
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3.2
sound pressure level
L
p
level given by the equation:
2
L = 10 lg pp/ dB (1)
( )
p0
where
L is the sound pressure level in dB;
p
p is the RMS sound pressure in Pa;
p is the reference sound pressure; p = 20 µPa
0 0
3.3
A-weighted sound pressure level
L
pA
sound pressure level obtained by using the frequency weighting A, given by the following formula:
2
L = 10 lg pp/ dB (2)
( )
pA A 0
where
L is the A-weighted sound pressure level in dB;
pA
p is the RMS A-weighted sound pressure in Pa;
A
p is the reference sound pressure; p = 20 µPa
0 0
Note 1 to entry: (see EN 61672-1 and EN 61672-2)
3.4
AF-weighted sound pressure level history
L (t)
pAF
A-weighted sound pressure level as a function of time with time weighting F (fast)
3.5
AF-weighted maximum sound pressure level
L max
pAF
maximum value of the A-weighted sound pressure level determined during the measurement time
interval T by using time weighting F (fast)
[SOURCE: EN 61672-1]
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3.6
A-weighted equivalent continuous sound pressure level
L
pAeq,T
A-weighted sound pressure level given by the following equation:
2 2
 T  T
pt pt
( ) ( )
11
AA
  
L 10 lg dtL dB 10lg (3)
pAeq,T pAeq,T
∫∫
  
2 2
TT
  
pp
0 0 0 0
  
where
L ,T is the A-weighted equivalent continuous sound pressure level in dB;
pAeq
T is the measurement time interval in s;
p (t) is the A-weighted instantaneous sound pressure in Pa;
A
p is the reference sound pressure; p = 20 µPa
0 0
[SOURCE: ISO 1996-1]
3.7
RMS sum
The sum of the root mean squares of sound pressures
LL L
 
p1 p2 pi
 
10 10 10
RMS sum 10lg 10+ 10++. 10 dB (4)
 
 
 
where
Lp1, Lp2 . Lip are a set of sound pressure levels
3.8
RMS average
average of the root mean square of sound pressures
 L 
p1 Lp2 LNp
 
10 10 10
10 + 10 ++. 10
 
RMS average = 10lg dB (5)
 N 
 
 
where
LL, . L are a set of sound pressure levels
p1 p2 pN
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4 Symbols and abbreviations
dB decibel
Hz Hertz, the SI unit of frequency
5 Instrumentation and calibration
5.1 Instrumentation
Each component of the instrumentation system shall meet the requirements for a class 1 instrument
specified in IEC 61672-1.
The sound calibrator shall meet the requirements of class 1 according to IEC 60942.
Microphones with free-field characteristics shall be used.
NOTE A suitable microphone windscreen should be used.
Where one-third octave frequency band analysis is required, the filters shall meet the requirements of
class 1, according to IEC 61260.
The compliance of the calibrator with the requirements of IEC 60942 shall be verified at least once a
year. The compliance of the instrumentation system with the requirements of IEC 61672-1 and
IEC 61672-2 shall be verified at least every 2 years. The date of the last verification of the compliance
with the relevant European Standards shall be recorded.
5.2 Calibration
Before and after each series of measurements a sound calibrator meeting the requirements of class 1
according to IEC 60942 shall be applied to the microphone(s) for verifying the calibration of the entire
measuring system at one or more frequencies over the frequency range of interest. If the difference
between the two calibrations is more than 0,5 dB all the measurement results in between shall be
rejected.
6 Interior tests
6.1 General
All the vestibules of a vehicle shall be classified into finite number of vestibule types. The list of
vestibule types is to be determined before measurements. Vestibule types are to be differentiated on
basis of the following distinctions:
a) whether the vestibule has single or double exterior doors;
b) whether there is a change in the number and type of partitions to the side of the vestibule area.
That is, a vertical wall, partition or door between vestibule and another area of the vehicle. Such a
partition may be partial or complete. A vestibule can have only 0, 1 or 2 such partitions, each of
which can be full or partial (e.g. panels either side of an open aisle but not, when a gangway door is
closed, forming a full partition of the vestibule from other parts of the train). No other property of
the partition than ‘full’ or ‘partial’ shall be considered;
c) whether there is a change in the mounting of the sounder to the vehicle structure. If there is a
difference in the mechanical impedance of the structure at the location of the mounting that would
lead to a change of the sound power emitted, this also differentiates a vestibule type;
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d) if there are differences in the sounder location such as:
— the height above the floor changes by more than 30 cm,
— the edge of the sounder is located within a distance of 4 cm from the junction of two or three
approximately normal surfaces compared to an installation at the door panel.
No other criteria shall be used as they affect the sound pressure level less significantly.
A difference between vestibules in any of these features shall cause a new vestibule type to be added to
the list of types.
6.2 Environmental conditions
The door opening of the vehicle shall be at least 5 m away from reflecting walls or roof of any building.
There are no requirements on the external ground conditions or ground height.
Care shall be taken to ensure that noise from other sources, e.g. other vehicles or industrial plants and
due to external wind, does not influence the measurements significantly.
For fixed sounders, the background noise level L measured over T = 20 s of each measurement
pAeq,T
position shall be at least 10 dB below the final result (L , L and, possibly, L , see 6.4).
pAF pAFmax pAeq,T
For adaptive sounders, the effective background noise is controlled by the method itself – see Annex B.
6.3 Vehicle conditions
The unit shall be stationary.
Surfaces shall present their normal operational acoustic properties.
As long as the background noise level requirement in 6.2 is fulfilled, any operational condition of
auxiliary equipment shall be accepted.
6.4 Measured quantities
The measured acoustic quantities are L , L and, possibly, L , with T as time of the
pAF pAFmax pAeq,T
sounder event duration. For the assessment of spectral content narrow band frequency analysis shall be
applied.
6.5 Measurement procedure
6.5.1 General
Separate procedures are defined below for estimating the sound pressure level of the signal in the
vehicle, for the duration of the signal, for determining the pulse rate and for determining the frequency
content. The first of these procedures, described in 6.5.3, shall be carried out in situ in the vehicle. The
pulse rate (6.5.4) and frequency content (6.5.5) may alternatively be determined from measurements
made of the door sounder component separately – see Annex C.
If an adaptive sounder system is present in the train, the background noise within the vestibule has to
be controlled using a sound source (see Annex B).
6.5.2 Microphone positions for measurements in the vehicle
For the interior tests two alternative microphone arrangements are allowed.
Arrangement 1: A single microphone is located between 1,4 and 1,6 m height above the vehicle floor
and anywhere within a lateral distance of 0,25 m from a point on the mid-plane of the vestibule normal
to the centre-line of the door opening. That is, within the cylindrical volume indicated in Figure 1.
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Key
1 mid way between the doors
2 height: 1,5 m
3 lateral distance: 0,25 m
4 range: ± 0,1 m
Figure 1 — Arrangement 1 with one microphone
Arrangement 2: Eight microphones equally distributed in a circle of radius 0,25 m about a point 1,5 m in
height above the vehicle floor and in the mid-plane of the vestibule normal to the centre-line of the door
opening shall be measured twice; (1) for the circle in the horizontal orientation and (2) for the circle in
a vertical orientation.
6.5.3 Sound pressure level estimation and duration of the signal
In a case of an adaptive level device an alternative measurement shall be carried out to ensure that the
sounder level is adapted to the ambient noise level. The measuring procedure for adaptive door sound
devices is described in Annex B.
For non-adaptive systems, the following procedure shall be followed.
For at least one microphone position the following shall be produced:
1) The time history of L shall be produced for the whole door opening signal and for the whole
pAF
door closing signal. This shall be used to determine the timing and duration of the signal in relation
to the operation of the door.
For all microphone positions the following shall be produced while the door is stationary (fully open,
fully closed). The noise of the operation of the door itself is thereby omitted from the following results:
2) L for the door opening signal taken from the part of the signal with the door closed;
pAF
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3) L for the door closing signal taken from the part of the signal with the door open;
pAFmax
4) If required, the L shall also be evaluated, where T is several cycles of the sound modulation.
pAeq,T
For arrangement 2, the results of 2, 3 and 4 at the microphone positions shall be the RMS average.
NOTE The requirements can involve testing the door for each of the cases in which the door is actuated and
not actuated.
6.5.4 Pulse rate estimation
This test may be performed on sound pressure measurements made on the door sounder component in
a suitable environment other than the vehicle (see Annex C).
To count the number of pulses per second a visual representation of the pulsing of the sounder noise
shall be produced.
NOTE It has been found that a plot of L where T is 10 ms will present a clear pulse up to 10 pulses per
pAeq,T
second. A plot of L will not. Alternatively, a spectrogram with a sufficient time resolution can be produced by
AF
many software packages. This has been found to provide a clear representation of pulse count.
6.5.5 Frequency analysis
This test may be performed on sound pressure measurements made on the door sounder component in
a suitable environment other than the vehicle (see Annex C).
To determine the frequency of tones within the signal a narrow band power spectrum shall be
produced that has a resolution no worse than 20 Hz.
NOTE The frequency can also be found in a spectrogram produced for the purpose of pulse rate estimation in
6.5.4.
6.5.6 Tonal prominence assessment
If required, an assessment of the relative audibility of different tones shall be carried out as described in
Annex A.
7 Exterior tests
7.1 General
The test shall be carried out on one entrance door of the unit.
7.2 Environmental conditions
The door opening of the vehicle shall be at least 5 m away from reflecting walls or roof of any building.
There are no requirements on the external ground conditions or ground height (with or without
platform).
Care shall be taken to ensure that the noise from other sources, e.g. other vehicles or industrial plants
and due to external wind, does not influence the measurements significantly.
For fixed sounders, the background noise level L measured over T = 20 s of each measurement
pAeq,T
position shall be at least 10 dB below the final result (L , L and, possibly, L , see 7.4).
pAF pAFmax pAeq,T
For adaptive sounders, the effective background noise is controlled by the method itself.
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7.3 Vehicle conditions
The unit shall be stationary.
As long as the background noise level requirement in 7.2 is fulfilled, any operational condition of
auxiliary equipment shall be accepted.
Wherever equipment of the unit under test contravenes the background noise requirement it is
permissible to switch off the noise emitting component.
7.4 Measured quantities
The measured acoustic quantities are L , L and, possibly, L , with T as time of the
pAF pAFmax pAeq,T
sounder event duration. For the assessment of spectral content narrow band frequency analysis shall be
applied.
7.5 Test procedure
7.5.1 General
Separate procedures are defined below for estimating the sound pressure level of the signal outside the
vehicle, for the duration of the signal, for determining the pulse rate and for determining the frequency
content. The procedures described in 7.5.3 shall be carried out in situ outside a vehicle. The pulse rate
(7.5.4) and frequency content (7.5.5) may alternatively be determined from measurements made of the
door sounder component separately – see A
...

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