BS EN 16272-6-2014 Railway applications Track Noise barriers and related devices acting on airborne sound propagation Test method for determining the acoustic performance Intrinsicd.pdf

1、BSI Standards PublicationBS EN 16272-6:2014Railway applications Track Noise barriers and relateddevices acting on airbornesound propagation Testmethod for determining theacoustic performancePart 6: Intrinsic characteristics In situvalues of airborne sound insulation underdirect sound field condition

2、sBS EN 16272-6:2014 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN 16272-6:2014.The UK participation in its preparation was entrusted to TechnicalCommittee RAE/2, Railway Applications - Track.A list of organizations represented on this committee can beobtained

3、on request to its secretary.This publication does not purport to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. The British Standards Institution 2014. Published by BSI StandardsLimited 2014ISBN 978 0 580 76212 3ICS 17.140.30; 93.080.30Compliance

4、 with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 30 November 2014.Amendments issued since publicationDate Text affectedBS EN 16272-6:2014EUROPEAN STANDARD NORME EUROPENNE EUR

5、OPISCHE NORM EN 16272-6 October 2014 ICS 17.140.30; 93.080.30 English Version Railway applications - Track - Noise barriers and related devices acting on airborne sound propagation - Test method for determining the acoustic performance - Part 6: Intrinsic characteristics - In situ values of airborne

6、 sound insulation under direct sound field conditions Applications ferroviaires - Dispositifs de rduction du bruit -Mthode dessai pour la dtermination des performances acoustiques - Partie 6 : Caractristiques intrinsques - Valeurs in situ de lisolation acoustique au bruit arien dans des conditions d

7、e champ acoustique direct Bahnanwendungen - Oberbau - Lrmschutzwnde und verwandte Vorrichtungen zur Beeinflussung der Luftschallausbreitung - Prfverfahren zur Bestimmung der akustischen Eigenschaften - Teil 6: Produktspezifische Merkmale - In-situ-Werte zur Luftschalldmmung in gerichteten Schallfeld

8、ern This European Standard was approved by CEN on 30 April 2014. 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 r

9、eferences 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

10、 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 Maced

11、onia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EURO

12、PISCHES KOMITEE FR NORMUNG CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2014 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 16272-6:2014 EBS EN 16272-6:2014EN 16272-6:2014 (E) 2 Contents Page Foreword 4 Introdu

13、ction . 5 1 Scope 8 2 Normative references 8 3 Terms and definitions . 8 4 Symbols and abbreviations 13 5 Sound insulation index measurements . 15 5.1 General principle 15 5.2 Measured quantity . 15 5.3 Test arrangement . 16 5.4 Measuring equipment 20 5.4.1 Components of the measuring system . 20 5.

14、4.2 Sound source . 21 5.4.3 Test signal 21 5.5 Data processing . 21 5.5.1 Calibration 21 5.5.2 Sample rate . 22 5.5.3 Background noise 22 5.5.4 Scanning technique using a single microphone 22 5.5.5 Scanning technique using nine microphones 23 5.5.6 Adrienne temporal window . 23 5.5.7 Placement of th

15、e Adrienne temporal window . 24 5.5.8 Low frequency limit and sample size 25 5.6 Positioning of the measuring equipment 26 5.6.1 Selection of the measurement positions 26 5.6.2 Post measurements . 27 5.6.3 Additional measurements . 27 5.6.4 Reflecting objects 27 5.6.5 Safety considerations . 27 5.7

16、Sample surface and meteorological conditions . 28 5.7.1 Condition of the sample surface 28 5.7.2 Wind 28 5.7.3 Air temperature 28 6 Measurement uncertainty . 28 7 Measuring procedure 28 8 Test report 29 8.1 Expression of results 29 8.2 Further information 29 Annex A (informative) Measurement uncerta

17、inty 31 A.1 General 31 A.2 Expression for the calculation of sound insulation index 31 A.3 Contributions to measurement uncertainty 32 A.4 Expanded uncertainty of measurement 33 A.5 Measurement uncertainty based upon reproducibility data . 33 Annex B (informative) Template of test report on airborne

18、 sound insulation of railway noise barriers . 34 BS EN 16272-6:2014EN 16272-6:2014 (E) 3 B.1 Template of test report 34 B.2 Test setup (example) . 36 B.3 Test object and test situation (example) . 38 B.4 Results (example) 40 Bibliography 46 BS EN 16272-6:2014EN 16272-6:2014 (E) 4 Foreword This docum

19、ent (EN 16272-6:2014) 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 April 201

20、5 and conflicting national standards shall be withdrawn at the latest by April 2015. 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. T

21、his document has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Association. This European Standard is one part of the series EN 16272, Railway applications Track Noise barriers and related devices acting on airborne sound propagation Test method fo

22、r determining the acoustic performance, as listed below: Part 1: Intrinsic characteristics Sound absorption in the laboratory under diffuse sound field conditions; Part 2: Intrinsic characteristics Airborne sound insulation in the laboratory under diffuse sound field conditions; Part 3-1: Normalized

23、 railway noise spectrum and single number ratings for diffuse field applications; Part 3-2: Normalized railway noise spectrum and single number ratings for direct field applications; Part 4: Intrinsic characteristics In situ values of sound diffraction under direct sound field conditions Part 5: Int

24、rinsic characteristics In situ values of sound reflection under direct sound field conditions (CEN/TS 16272-5); Part 6: Intrinsic characteristics In situ values of airborne sound insulation under direct sound field conditions. It will be read in conjunction with: EN 16272-2; EN 16272-3-1; EN 16272-3

25、-2. 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, Former Yugoslav Republic of Macedonia, France,

26、 Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. BS EN 16272-6:2014EN 16272-6:2014 (E) 5 Introduction Noise barriers installed along

27、 railways need to provide adequate sound insulation so that sound transmitted directly through the device is not significant compared to the sound diffracted over the top. This European Standard specifies a test method for assessing the airborne sound insulation performance of noise barriers and rel

28、ated devices acting on airborne sound propagation designed for railways in non-reverberant conditions (a measure of intrinsic performance). It can be applied in situ, i.e. where the noise barriers are installed. The method can be applied without damaging the surface. The method can be used to qualif

29、y products to be installed along railways as well as to verify the compliance of installed noise barriers to design specifications. Regular application of the method can be used to verify the long term performance of noise barriers. The method requires the averaging of results of measurements taken

30、at different points behind the device under test. The method is able to investigate flat and non-flat products. The measurement results of this method for airborne sound insulation are comparable but not identical with the results of the EN 16272-2 method, mainly because the present method uses a di

31、rectional sound field, while the EN 16272-2 method assumes a diffuse sound field (where all angles of incidence are equally probable). The test method described in this European Standard should not be used to determine the intrinsic characteristics of airborne sound insulation for noise barriers to

32、be installed in reverberant conditions, e.g. inside tunnels or deep trenches or under covers or very close to the rail track. For the purpose of this European standard reverberant conditions are defined based on the geometric envelope, e, across the rail formed by the barriers, trench sides or build

33、ings (the envelope does not include the railway surface) as shown by the dashed lines in Figure 1. Conditions are defined as being reverberant when the percentage of open space in the envelope is less than or equal to 25 %, i.e.: Reverberant conditions occur when w/e 0,25, where e = (w + h1+ h2) Thi

34、s criterion is applied also to the open space between the train body and the barrier surface. BS EN 16272-6:2014EN 16272-6:2014 (E) 6 a) Partial cover on both sides of the railway; envelope, e = w + h1+ h2b) Partial cover on one side of the railway; e = w + h1c) Deep trench envelope, e = w + h1+ h2d

35、) Tall barriers or buildings; envelope, e = w + h1+ h2e) Train passing close to a noise barrier envelope, e = w + h1+ h2f) Train passing close to a platform at the station, e = w + h1+ h2Key TOR Top of Rail (railway surface) w width of open space Figure 1 (not to scale) Sketch of the reverberant con

36、dition check in six cases This European Standard introduces a specific quantity, called sound insulation index, to define the airborne sound insulation of a noise barrier. This quantity should not be confused with the sound reduction index used in building acoustics, sometimes also called transmissi

37、on loss. Research studies suggest that a very good correlation exists BS EN 16272-6:2014EN 16272-6:2014 (E) 7 between data measured according to EN 16272-2 and data measured according to the method described in the present document. This method may be used to qualify noise barriers for other applica

38、tions, e.g. to be installed along roads or nearby industrial sites. In this case the single-number ratings should be calculated using an appropriate spectrum. BS EN 16272-6:2014EN 16272-6:2014 (E) 8 1 Scope This European Standard describes a test method for measuring a quantity representative of the

39、 intrinsic characteristics of airborne sound insulation for railway noise barriers: the sound insulation index. The test method is intended for the following applications: determination of the intrinsic characteristics of airborne sound insulation of noise barriers to be installed along railways, to

40、 be measured either on typical installations alongside railways or on a relevant sample section; determination of the in situ intrinsic characteristics of airborne sound insulation of noise barriers in actual use; comparison of design specifications with actual performance data after the completion

41、of the construction work; verification of the long term performance of noise barriers (with a repeated application of the method); interactive design process of new products, including the formulation of installation manuals. The test method is not intended for the following applications: determinat

42、ion of the intrinsic characteristics of airborne sound insulation of noise barriers to be installed in reverberant conditions, e.g. inside tunnels or deep trenches or under covers. Results are expressed as a function of frequency in one-third octave bands, where possible, between 100 Hz and 5 kHz. I

43、f it is not possible to get valid measurement results over the whole frequency range indicated, the results will be given in a restricted frequency range and the reasons for the restriction(s) will be clearly reported. All noise reducing devices different from noise barriers and related devices acti

44、ng on airborne sound propagation, e.g. devices for attenuation of ground borne vibration and on board devices are out of the scope of this European Standard. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its

45、 application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 16272-2, Railway applications Track Noise barriers and related devices acting on airborne sound propagation Test method for

46、 determining the acoustic performance Part 2: Intrinsic characteristics Airborne sound insulation in the laboratory under diffuse sound field conditions EN 16272-3-2, Railway applications Track Noise barriers and related devices acting on airborne sound propagation Test method for determining the ac

47、oustic performance Part 3-2: Normalized railway noise spectrum and single number ratings for direct field applications EN 61672-1, Electroacoustics Sound level meters Part 1: Specifications (IEC 61672-1) ISO/IEC Guide 98-3, Uncertainty of measurement Part 3: Guide to the expression of uncertainty in

48、 measurement (GUM:1995) 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. BS EN 16272-6:2014EN 16272-6:2014 (E) 9 3.1 noise barrier noise reducing device, which obstructs the direct transmission of airborne sound emanating from railways Note 1 to e

49、ntry: It may either span or overhang the railway. Note 2 to entry: Noise barriers are generally made of acoustic and structural elements (3.3 and 3.4). 3.2 cladding noise reducing device, which is attached to a wall or other structure and reduces the amount of sound reflected Note 1 to entry: Claddings are generally made of acoustic and structural elements (3.3 and 3.4). 3.3 acoustic element element whose primary function is to provide the acoustic performance of the device 3.4 structural