Railway applications - Acoustics - Measurement of noise inside railbound vehicles (ISO 3381:2005)

This European Standard specifies the conditions for obtaining reproducible and comparable measurement results of levels and spectra of noise inside all kinds of vehicles on rails or other types of fixed track, hereinafter conventionally called "train", except for track maintenance vehicles in operation.

Bahnanwendungen - Akustik - Geräuschmessungen in spurgebundenen Fahrzeugen (ISO 3381:2005)

Diese Europäische Norm legt die Bedingungen fest, die einzuhalten sind, um reproduzierbare und vergleichbare Messergebnisse für die Geräuschpegel und -spektren im Inneren von Schienenfahrzeugen oder anderen spurgebundenen Fahrzeugen, nachfolgend „Züge“ genannt, zu erzielen. Ausge¬nommen ist der Betrieb von Fahrzeugen zur Wartung des Fahrweges.
Diese Norm ist anwendbar auf
   Typprüfungen;
   periodische Überwachungsmessungen.
Diese Ergebnisse können z. B. benutzt werden,
-   um die Geräusche im Inneren dieser Fahrzeuge zu beschreiben;
-   um die Geräusche im Inneren verschiedener Fahrzeuge auf einem bestimmten Gleisabschnitt zu vergleichen.
Die in dieser Europäischen Norm festgelegten Prüfverfahren sind Verfahren der nach EN ISO 12001 für Zwecke der Geräuschangabe bevorzugten Genauigkeitsklasse 2 (mit einer Genauigkeit von  2 dB).
Die Norm beschreibt Prüfungen unter verschiedenen Betriebsbedingungen, d. h. Fahren, Beschleunigen, Bremsen und Stillstand. Die jeweiligen Betriebsbedingungen werden von der zuständigen Behörde oder dem Fahrzeugeigner/-betreiber gewählt. Es ist nicht verpflichtend, Prüfungen bei allen Bedingungen durchzuführen.
Infraschall und die Verständlichkeit von Durchsagen sind nicht Gegenstand dieser Norm.
Die für Prüfungen bei Beschleunigungs- und Bremsvorgängen festgelegten Verfahren sind Verfahren der Genauig¬keitsklasse 3.

Applications ferroviaires - Acoustique - Mesurage du bruit à l'intérieur des véhicules circulant sur rails (ISO 3381:2005)

L'ISO 3381:2005 spécifie les conditions requises pour obtenir des résultats de mesure reproductibles et comparables des niveaux et des spectres du bruit émis à l'intérieur de tous les types de véhicules circulant sur rails ou tous autres véhicules à déplacement guidé, ci-après désignés conventionnellement «train», exceptés les véhicules de maintenance de la voie en fonctionnement.
Elle est applicable pour les essais de type et les essais de contrôle périodique («monitoring»).
Les résultats peuvent être utilisés, par exemple, pour caractériser le bruit émis à l'intérieur de ces trains et pour comparer l'émission de bruit intérieur de différents véhicules sur une section de voie particulière.
Les procédures d'essai décrites dans l'ISO 3381:2005 sont de la classe expertise (classe 2, avec une précision de plus ou moins 2 dB), méthode à préférer pour la déclaration du bruit, telle que définie dans l'ISO 12001.

Železniške naprave - Akustika - Merjenje hrupa v tirnih vozilih (ISO 3381:2005)

Ta evropski standard določa pogoje pridobitve ponovljivih in primerljivih rezultatov meritev nivojev in spektra hrupa v vseh vrstah vozil na tirih ali drugih vrstah pritrjenih tirnic, v nadaljevanju konvencionalno imenovane »vlak», razen vozil za vzdrževanje tirov v delovanju.

General Information

Status
Withdrawn
Public Enquiry End Date
24-Dec-2010
Publication Date
07-Apr-2011
Withdrawal Date
03-Oct-2021
Technical Committee
Current Stage
9900 - Withdrawal (Adopted Project)
Start Date
30-Sep-2021
Due Date
23-Oct-2021
Completion Date
04-Oct-2021

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Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN ISO 3381:2011
01-maj-2011
1DGRPHãþD
SIST EN ISO 3381:2005
Železniške naprave - Akustika - Merjenje hrupa v tirnih vozilih (ISO 3381:2005)
Railway applications - Acoustics - Measurement of noise inside railbound vehicles (ISO
3381:2005)
Bahnanwendungen - Akustik - Geräuschmessungen in spurgebundenen Fahrzeugen
(ISO 3381:2005)
Applications ferroviaires - Acoustique - Mesurage du bruit à l'intérieur des véhicules
circulant sur rails (ISO 3381:2005)
Ta slovenski standard je istoveten z: EN ISO 3381:2011
ICS:
17.140.30 Emisija hrupa transportnih Noise emitted by means of
sredstev transport
45.060.01 Železniška vozila na splošno Railway rolling stock in
general
SIST EN ISO 3381:2011 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN ISO 3381:2011

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SIST EN ISO 3381:2011


EUROPEAN STANDARD
EN ISO 3381

NORME EUROPÉENNE

EUROPÄISCHE NORM
March 2011
ICS 17.140.30; 45.020 Supersedes EN ISO 3381:2005
English Version
Railway applications - Acoustics - Measurement of noise inside
railbound vehicles (ISO 3381:2005)
Applications ferroviaires - Acoustique - Mesurage du bruit à Bahnanwendungen - Akustik - Geräuschmessungen in
l'intérieur des véhicules circulant sur rails (ISO 3381:2005) spurgebundenen Fahrzeugen (ISO 3381:2005)
This European Standard was approved by CEN on 31 January 2011.

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, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.





EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2011 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 3381:2011: E
worldwide for CEN national Members.

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SIST EN ISO 3381:2011
EN ISO 3381:2011 (E)
Contents Page
Foreword .3
Annex ZA (informative) Relationship between this European Standard and the Essential
Requirements of EU Directive 2008/57/EC .4

2

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SIST EN ISO 3381:2011
EN ISO 3381:2011 (E)
Foreword
The text of ISO 3381:2005 has been prepared by Technical Committee ISO/TC 43 “Acoustics” of the
International Organization for Standardization (ISO) and has been taken over as EN ISO 3381:2011 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 September 2011, and conflicting national standards shall be
withdrawn at the latest by September 2011.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN ISO 3381:2005.
This document has been prepared under a mandate given to CEN/CENELEC/ETSI by the European
Commission and the European Free Trade Association, and supports essential requirements of EU Directive
2008/57/EC.
For relationship with EU Directive 2008/57/EC, see informative Annex ZA, which is an integral part of this
document.
The “Recast” Directive 2008/57/EC of the European Parliament and of the Council on the interoperability of
the rail system within the Community was published on 17th June 2008. The two previous EU directives
96/48/EC and 2001/16/EC on the interoperability of the High Speed and Conventional rail systems within the
Community will therefore be repealed with effect from 19th July 2010. At this date the harmonised standards
for the railway field will have to refer to the new Directive.
Annex ZA is amended to address this need.
According to the CEN/CENELEC Internal Regulations, the national standards organizations 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, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland and the United Kingdom.
Endorsement notice
The text of ISO 3381:2005 has been approved by CEN as a EN ISO 3381:2011 without any modification.
3

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SIST EN ISO 3381:2011
EN ISO 3381:2011 (E)
Annex ZA
(informative)

Relationship between this European Standard and the Essential
Requirements of EU Directive 2008/57/EC
This European Standard has been prepared under a mandate given to CEN/CENELEC/ETSI by the European
Commission and the European Free Trade Association to provide a means of conforming to Essential
1)
Requirements of the Directive 2008/57/EC .
Once this standard is cited in the Official Journal of the European Union under that Directive and has been
implemented as a national standard in at least one Member State, compliance with the clauses of this
standard given in Table ZA.1 for High Speed Rolling Stock and Table ZA.2 for Conventional Rolling Stock
Noise confers, within the limits of the scope of this standard, a presumption of conformity with the
corresponding Essential Requirements of that Directive and associated EFTA regulations.

1) This Directive 2008/57/EC adopted on 17 June 2008 is a recast of the previous Directives 96/48/EC ‘Interoperability of
the trans-European high-speed rail system’ and 2001/16/EC ‘Interoperability of the trans-European conventional rail
system’ and revisions thereof by 2004/50/EC ‘Corrigendum to Directive 2004/50/EC of the European Parliament and of the
Council of 29 April 2004 amending Council Directive 96/48/EC on the interoperability of the trans-European high-speed rail
system and Directive 2001/16/EC of the European Parliament and of the Council on the interoperability of the trans-
European conventional rail system’
4

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SIST EN ISO 3381:2011
EN ISO 3381:2011 (E)
Table ZA.1 — Correspondence between this European Standard, the HS TSI RST published in the
OJEU dated 26 March 2008 and Directive 2008/57/EC
Clause/ subclauses of Chapter/§/annexes Corresponding text, Comments
this European of the TSI articles/§/annexes of
Standard the Directive
2008/57/EC
The whole standard is Annex III, Essential The HS TSI RST as well
applicable except clause requirements as the CR TSI Noise
6.3.4 b) dealing with the consider interior noise as
1 General requirements
noise measurement inside an interoperable issue
driver's cabs. 1.4 Environmental only in the limited case of
the driver's cab.
protection
1.4.4. Operation of the For the interior noise of
the driver's cab, the TSIs
rail system must respect
existing regulations on give limit values; the
measurement will be
noise pollution
detailed in EN 15892.
Therefore, the Annex ZA
for EN ISO 3381
excludes all clauses in
EN ISO 3381 related to
the measurements inside
driver's cabs.
For the HS TSI RST as
well as the CR TSI
Noise, the draft ERA
Application Guides
designate EN ISO 3381
as a voluntary standard.

5

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SIST EN ISO 3381:2011
EN ISO 3381:2011 (E)
Table ZA.2 — Correspondence between this European Standard, the CR TSI Noise published in the
OJEU dated 23 December 2005 and Directive 2008/57/EC
Clause/ subclauses of Chapter/§/annexes Corresponding text, Comments
this European of the TSI articles/§/annexes of
Standard the Directive
2008/57/EC
The whole standard is Annex III, Essential The HS TSI RST as well
applicable except clause requirements as the CR TSI Noise
6.3.4 b) dealing with the consider interior noise as
1 General requirements
noise measurement inside an interoperable issue
driver's cabs. 1.4 Environmental only in the limited case of
the driver's cab.
protection
1.4.4. Operation of the For the interior noise of
the driver's cab, the TSIs
rail system must respect
existing regulations on give limit values; the
measurement will be
noise pollution
detailed in EN 15892.
Therefore, the Annex ZA
for EN ISO 3381
excludes all clauses in
EN ISO 3381 related to
the measurements inside
driver's cabs.
For the HS TSI RST as
well as the CR TSI
Noise, the draft ERA
Application Guides
designate EN ISO 3381
as a voluntary standard.

WARNING — Other requirements and other EU Directives may be applicable to the product(s) falling within
the scope of this standard.

6

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SIST EN ISO 3381:2011


INTERNATIONAL ISO
STANDARD 3381
Second edition
2005-08-15

Railway applications — Acoustics —
Measurement of noise inside railbound
vehicles
Applications ferroviaires — Acoustique — Mesurage du bruit à l'intérieur
des véhicules circulant sur rails




Reference number
ISO 3381:2005(E)
©
ISO 2005

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SIST EN ISO 3381:2011
ISO 3381:2005(E)
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electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or
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ii © ISO 2005 – All rights reserved

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SIST EN ISO 3381:2011
ISO 3381:2005(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies
(ISO member bodies). The work of preparing International Standards is normally carried out through ISO
technical committees. Each member body interested in a subject for which a technical committee has been
established has the right to be represented on that committee. International organizations, governmental and
non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the
International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO 3381 was prepared by the European Committee for Standardization (CEN) in collaboration with Technical
Committee ISO/TC 43, Acoustics, Subcommittee SC 1, Noise, in accordance with the Agreement on technical
cooperation between ISO and CEN (Vienna Agreement).
Throughout the text of this document, read “.this European Standard.” to mean “.this International
Standard.”.
This second edition cancels and replaces the first edition (ISO 3381:1976), which has been technically
revised.
For the purposes of this International Standard, the CEN annex regarding fulfilment of European Council
Directives has been removed.


© ISO 2005 – All rights reserved iii

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SIST EN ISO 3381:2011
ISO 3381:2005(E)


Contents
page
Foreword .v
1 Scope .1
2 Normative references .1
3 Terms and definitions.1
4 Measurement quantities .4
5 Instrumentation.5

6 Test conditions .5
7 Test procedure .9
8 Test report .10
Annex A (normative) Rail roughness measurement specifications. 11
Annex B (informative) Major influence parameters on track noise including track dynamics. 17

Bibliography.18

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SIST EN ISO 3381:2011
ISO 3381:2005(E)


Foreword
This European Standard (EN ISO 3381:2005) has been prepared by Technical Committee CEN/TC 256
“Railway applications”, the secretariat of which is held by DIN, in collaboration with Technical Committee
ISO/TC 43 "Acoustics".
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 2006, and conflicting national standards shall be withdrawn
at the latest by February 2006.
This document has been prepared under a mandate given to CEN/CENELEC/ETSI by the European
Commission and the European Free Trade Association, and supports essential requirements of EU Directive
96/48.
For relationship with EU Directive(s), see informative Annex ZA, which is an integral part of this document.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following
countries are bound to implement this European Standard: Austria, Belgium, Cyprus, Czech Republic,
Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland
and United Kingdom.

© ISO 2005 – All rights reserved v

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SIST EN ISO 3381:2011

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SIST EN ISO 3381:2011
ISO 3381:2005(E)

1 Scope
This European Standard specifies the conditions for obtaining reproducible and comparable measurement
results of levels and spectra of noise inside all kinds of vehicles on rails or other types of fixed track,
hereinafter conventionally called “train”, except for track maintenance vehicles in operation.
This standard is applicable for:
⎯ type testing;
⎯ periodic monitoring testing.
The results may be used, for example:
⎯ to characterise the noise inside these vehicles;
⎯ to compare the internal noise of various vehicles on a particular track section.
The test procedures specified in this European Standard are of engineering grade (grade 2, with a precision of
± 2 dB), that is the preferred one for noise declaration purposes, as defined in EN ISO 12001.
The standard describes tests during different operating conditions, i.e. driving, accelerating, decelerating and
standstill. The chosen operating conditions are decided by the relevant authority or the train owner/operator. It
is not mandatory to perform tests at all conditions.
Infrasound and messages intelligibility are not treated in this standard.
The procedures specified for accelerating and decelerating tests are of survey grade.
2 Normative references
The following referenced documents are indispensable for the application 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 60942, Electroacoustics — Sound calibrators (IEC 60942:2003)
EN 61260, Electroacoustics — Octave-band and fractional-octave-band filters (IEC 61260:1995)
EN 61672-1:2003, Electroacoustics — Sound level meters — Part 1: Specifications (IEC 61672-1:2002)
3 Terms and definitions
For the purposes of this European Standard, the following terms and definitions apply.
3.1
type test for noise emission of railbound vehicles
type test
measurement performed to prove that, or to check if, a vehicle delivered by the manufacturer complies with
the noise specifications
© ISO 2005 – All rights reserved 1

© ISO 2005 – All rights reserved

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SIST EN ISO 3381:2011
ISO 3381:2005(E)

3.2
monitoring test for noise emission of railbound vehicles
monitoring test
measurement performed to check that the noise of one or more vehicles, taken among individual units in a
consignment of vehicles, is within prescribed limits or to check if the noise of the vehicle has changed since
initial delivery or after modification
3.3
roughness
r
root mean square (RMS) value of the amplitude variation of the running surface of a rail in the direction of
motion (longitudinal level) measured over a rail length, expressed in µm
3.4
roughness level
L
r
level given by the equation:
2
Lr = 10 lg (/r) dB         (1)
r0
where
L  is the roughness level in dB;
r
r  is the RMS roughness in µm;
r  the reference roughness; r =1 µm.
0 0
This definition applies to values measured either as a wavelength spectrum or in a particular wavelength band
centred at λ (expressed in m)
3.5
sound pressure
p(t)
root mean square (RMS) value of a fluctuating pressure superimposed on the static atmospheric pressure
measured over a certain time period, expressed in Pa
3.6
sound pressure level
L
p
level given by the equation:

2
Lp = 10 lg ((t)/p) dB (2)
p 0
where
L  is the sound pressure level in dB;
p
p(t)  is the RMS sound pressure in Pa;
p the reference sound pressure; p . = 20 µPa.
0 0
NOTE Definitions from 3.6 to 3.11 apply to values measured either as a frequency spectrum or in a particular
frequency band of centre f (expressed in Hz).
2 © ISO 2005 – All rights reserved

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SIST EN ISO 3381:2011
ISO 3381:2005(E)
3.7
A-weighted sound pressure level
L
pA
sound pressure level obtained by using the frequency weighting A (see EN 61672-1), given by the following
equation:
2
Lp= 10 lg ( (t)p ) dB
pAA0
(3)
where
L is the A-weighted sound pressure level in dB;
pA
p (t)  is the RMS A-weighted sound pressure in Pa;
A
p the reference sound pressure; p . = 20 µPa.
0 0
3.8
AF-weighted maximum sound pressure level
L
pAFmax
maximum value of the A-weighted sound pressure level determined during the measurement time interval T
by using time weighting fast F
[EN 61672-1]
3.9
A-weighted equivalent continuous sound pressure level
L
pAeq,T
A-weighted sound pressure level given by the following equation:
T
2
⎛⎞
pt
()
1
A
⎜⎟
Lt=10 lg d dB       (4)
pTAeq,

2
⎜⎟
T
p
0
⎝⎠0
where
L is the A-weighted equivalent continuous sound pressure level in dB;
pAeq,T
T  is the measurement time interval in s;
p (t)  is the A-weighted instantaneous sound pressure in Pa;
A
p the reference sound pressure; p = 20 µPa.
0 0
3.10
A-weighted short-term equivalent continuous sound pressure level
L
pAeq,1s
A-weighted equivalent continuous sound pressure level (see 3.9) where the measurement time interval T is
one second (T = 1s)
3.11
A-weighted equivalent continuous impulsive sound pressure level
L
pAIeq,T
A-weighted equivalent continuous sound pressure level determined by using time weighting impulse I
(see EN 61672-1) given by the following equation:
3
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SIST EN ISO 3381:2011
ISO 3381:2005(E)
T
2
⎛⎞
pt()
1
AI
⎜⎟
Lt=10 lg d dB       (5)
pTAIeq,

2
⎜⎟T
p
0
0
⎝⎠
where
L is the A-weighted equivalent continuous impulsive sound pressure level in dB;
pAIeq,T
T  is the measurement time interval in s;
p (t)  is the A-weighted instantaneous sound pressure using time weighting I (Impulse) in Pa;
AI
p the reference sound pressure; p . = 20 µPa.
0 0
3.12
noise with impulsive character
noise which contains an isolated event or a series of such events. The impulsive character is conventionally
confirmed if the difference between L and L is greater than 3 dB
pAleq,T pAeq,T
3.13
noise with tonal character
noise which contains audible tones
4 Measurement quantities
4.1 General
The quantities to be measured at all microphone positions for both type and monitoring tests are specified
below.
4.2 Frequency analysis is required for type tests while it is optional for monitoring tests. The typical 1/3 octave
band frequency range is from 31,5 Hz to 8 kHz according to EN ISO 266. It is important, however, that the
lower frequency limit is chosen to ensure that the product of the lowest bandwidth and signal duration exceeds
unity.
4.3 In presence of noise with suspected impulsive character, both L and L shall be measured. If
pAIeq,T pAeq,T
they differ by more than 3 dB the impulsive character is conventionally confirmed.
4.4 In presence of noise with suspected tonal character, at each microphone position it is suggested to make
frequency analysis measurements according to 4.2.
4.5 The measurement quantity for trains running at constant speed is the A-weighted equivalent continuous
sound pressure level, L .
pAeq,T
Additionally, the A-weighted short-term equivalent continuous sound pressure level, L may be measured.
pAeq,1s
4.6 For measurements on stationary vehicles, in presence of noise with suspected impulsive character, at
each microphone position it is suggested to make two measurements: one with time weighting slow S, the
other with time weighting impulse I (see EN 61672-1).
4.7 The measuring quantities for accelerating or braking tests shall be the maximum AF-weighted sound
pressure level, L , and the A-weighted equivalent continuous sound pressure level, L . The
pAFmax pAeq,T
measurement time interval,T is defined in Clause 7.
4
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SIST EN ISO 3381:2011
ISO 3381:2005(E)
5 Instrumentation
The instrumentation system, including the microphones, cables and recording devices shall meet the
requirements for a type 1 instrument specified in EN 61672-1.
The microphones shall have an essentially flat frequency response in a free sound field.
The one-third-octave band filters shall meet the requirements of class 1 according to EN 61260.
A windscreen shall always be fitted on the microphone.
Before and after each series of measurements, a sound calibrator with a class 1 accuracy according to
EN 60942 shall be applied to the microphone(s) in order to verify 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 shall be rejected.
The compliance of the calibrator with the requirements of EN 60942 shall be verified at least once a year. The
compliance of the instrumentation system with the requirements of EN 61672-1 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.
6 Test conditions
6.1 Deviations from the requirements
The conditions prescribed for each test shall be complied with as closely as possible. Slight deviations from
the specified test conditions are permissible, but shall be described in the test report and in general, will lower
the reproducibility.
6.2 Test environment
6.2.1 Acoustical environment
The test site for chiefly outside-moving vehicles shall be such that the sound radiated by the vehicle to the
outside contributes to the inside noise only by reflections from the track and not by reflections from buildings,
walls or similar large objects outside the track.
For vehicles moving inside tunnels (like underground) the measurement shall be carried out in real operating
conditions.
In the immediate vicinity of the track, there shall be no additional absorbent covering or snow.
6.2.2 Meteorological conditions
Measurements shall be made only if the wind speed measured at the microphone height is below 5 m/s and
there is no falling rain or snow. Temperature, humidity, barometric pressure, wind speed and direction shall be
described (possibly with measured values) in the test report.
6.2.3 Background sound pressure level
Care shall be taken to ensure that the noise from other sources (for example other vehicles or industrial
plants) does not influence significantly the measurements.
For type tests, the A-weighted background sound pressure level shall be at least 10 dB below the reading of
the A-weighted sound pressure level obtained when measuring the noise from the vehicle in the presence of
© ISO 2005 – All rights reserved 5

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SIST EN ISO 3381:2011
ISO 3381:2005(E)
background noise. For frequency analysis this difference shall be at least 10 dB in each frequency band of
interest.
For monitoring tests, the A-weighted background sound pressure level shall be at least 5 dB below the
reading of the A-weighted sound pressure level obtained when measuring the noise from the vehicle in the
presence of background noise. If this difference is less than 10 dB the reading shall be corrected according to
Table 1.
NOTE If the above-mentioned difference is less than 5 dB a measurement of engineering grade (grade 2) is no
longer possible.
Table 1 — Background noise correction for monitoring tests
Difference between the A-weighted sound Correction to be added to the A-weighted
pressure level obtained when measuring the sound pressure level obtained when
noise inside the vehicle in the presence of measuring the interior vehicle noise in the
background noise and the A-weighted presence of background noise
background sound pressure level alone

dB dB
>10 0
6 to 9 –1
5 –2
6.3 Microphone positions
6.3.1 General
The measured sound pressure level inside a vehicle may vary considerably with location.
In particular, above the wheelsets or underfloor auxiliary equipment a higher sound level is likely. Therefore,
the number of measuring points selected shall be such that the sound level distribution in the vehicle is
adequately represented.
In general, five to seven measuring points, which include the middle and the ends of the vehicle, will be
sufficient. The exact microphone positions shall be indicated
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