BS EN 16272-1-2012 Railway applications Track Noise barriers and related devices acting on airborne sound propagation Test method for determining the acoustic performance Intrinsico.pdf

1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS EN 16272-1:2012Railway applications Track Noise barriers and related devices acting on airborne sound propagation Test method for determining the acoustic performancePart 1: I

2、ntrinsic characteristics Sound absorption in the laboratory under diffuse sound field conditionsBS EN 16272-1:2012 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN 16272-1:2012. The UK participation in its preparation was entrusted to T e c h n i c a l Committee

3、RAE/2, Railway Applications - Track.A list of organizations represented on this committee can be obtained on request to its secretary.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. The British Standards Inst

4、itution 2012. Published by BSI Standards Limited 2012.ISBN 978 0 580 74706 9 ICS 17.140.30; 93.100 Compliance with a British Standard cannot confer immunity from legal obligations.This British Standard was published under the authority of the Standards Policy and Strategy Committee on 30 November 20

5、12.Amendments issued since publicationDate T e x t a f f e c t e dBS EN 16272-1:2012EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 16272-1 October 2012 ICS 93.100 English Version Railway applications - Track - Noise barriers and related devices acting on airborne sound propagation - Test metho

6、d for determining the acoustic performance - Part 1: Intrinsic characteristics - Sound absorption in the laboratory under diffuse sound field conditions Applications ferroviaires - Dispositifs de rduction du bruit -Mthode dessai pour la dtermination des performances acoustiques - Partie 1: Caractris

7、tiques intrinsques - Absorption acoustique en salle rverbrante dans des conditions de champ acoustique diffus Bahnanwendungen - Oberbau - Lrmschutzwnde und verwandte Einrichtungen zur Beeinflussung der Luftschallausbreitung - Prfverfahren zur Bestimmung der akustischen Eigenschaften - Teil 1: Produk

8、tspezifische Merkmale - Schallabsorption (Labormethode) bei diffusen Schallfeldern This European Standard was approved by CEN on 15 September 2012. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of

9、 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)

10、. 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, C

11、yprus, 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, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United

12、Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels 2012 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 16272-1:2012: E

13、BS EN 16272-1:2012EN 16272-1:2012 (E) 2 Contents Page Foreword 3Introduction .41 Scope 52 Normative references 53 Terms and definitions .54 Symbols and abbreviations 65 Test arrangement .66 Test procedure and evaluation 107 Measurement uncertainty 108 Test report . 108.1 Expression of results . 108.

14、2 Further information. 11Annex A (informative) Measurement uncertainty . 12A.1 General . 12A.2 Measurement uncertainty based upon reproducibility data 12Bibliography . 13BS EN 16272-1:2012EN 16272-1:2012 (E) 3 Foreword This document (EN 16272-1:2012) has been prepared by Technical Committee CEN/TC 2

15、56 “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 2013, and conflicting national standards shall be withdrawn at the latest

16、by April 2013. 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 has been prepared under a mandate given to CEN by the Eur

17、opean Commission and the European Free Trade Association. This European Standard is one of the series EN 16272 “Railway applications Track Noise barriers and related devices acting on airborne sound propagation Test method for determining the acoustic performance“ as listed below: Part 1: Intrinsic

18、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: Normalised railway noise spectrum and single number ratings for diffuse field applicati

19、ons Part 3-2: Normalized railway noise spectrum and single number ratings for direct field applications 1) Part 4: Intrinsic characteristics In situ values of sound diffraction under direct sound field conditions 1) Part 5: Intrinsic characteristics In situ values of sound reflection under direct so

20、und field conditions 2) Part 6: Intrinsic characteristics In situ values of airborne sound insulation under direct sound field conditions 1) Part 7: Extrinsic characteristics In situ values of insertion loss 2)According to the CEN/CENELEC Internal Regulations, the national standards organisations of

21、 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, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Neth

22、erlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. 1) In preparation. 2) This document has been prepared as a CEN Technical Specification and is in preparation. BS EN 16272-1:2012EN 16272-1:2012 (E) 4 Introduction Where a sound

23、reflecting surface is installed along a railway, it may be effective to use sound absorbing devices on its rail side to reduce additional noise nuisance caused by reflected sound. This treatment may be needed in the presence of the following: noise barriers, rocks or retaining walls that can reflect

24、 sound waves toward unprotected areas; vertical cuttings or reflective surfaces that face each other; tunnels and their approaches; trains passing close to a barrier where reflections between the train and the barrier may give rise to a reverberant field and thus reduce barrier effectiveness. This E

25、uropean Standard specifies a test method for assessing the sound absorption performance of noise barriers and related devices acting on airborne sound propagation designed for railways (a measure of intrinsic performance). It is not concerned with determining sound absorption performance in situ, no

26、r with determining the acoustic efficiency at receiver positions (insertion loss), which additionally depend on factors which are not related to the product itself, e.g. the dimensions of the barrier and quality of installation work and site factors such as site geometry, ground impedance, meteorolo

27、gical effects, etc. The test is designed to allow the intrinsic sound absorption performance of the device under test to be measured and the resulting rating should aid the selection of the devices for particular railway applications. The measurements results of this method for sound absorption are

28、comparable but not identical with the results of the FprCEN/TS 16272-5 method, mainly because the present method assumes a diffuse sound field (where all angles of incidence are equally probable), while the FprCEN/TS 16272-5 method uses a directional sound field. Values of the sound absorption coeff

29、icient measured with the method described in this European Standard can be converted to conventional values of a reflection coefficient taking the complement to one. In this case, research studies suggest that a quite good correlation exists between data measured according to the method described in

30、 the present European Standard and data measured according to the method described in FprCEN/TS 16272-5. The test method described in this European Standard should not be used to determine completely the intrinsic characteristics of sound absorption for noise reducing devices to be installed in non-

31、reverberant conditions, e.g. alongside railways in open space. This method may be used to qualify noise reducing devices for other applications, e.g. to be installed along roads or nearby industrial sites. In such cases, the single-number ratings should be calculated using an appropriate spectrum. T

32、his European Standard should be read in conjunction with: EN 16272-3-1, Railway applications Track Noise barriers and related devices acting on airborne sound propagation Test method for determining the acoustic performance Part 3-1: Normalised railway noise spectrum and single number ratings for di

33、ffuse field applications FprCEN/TS 16272-5, Railway applications Track Noise barriers and related devices acting on airborne sound propagation Test method for determining the acoustic performance Part 5: Intrinsic characteristics In situ values of sound reflection under direct sound field conditions

34、 BS EN 16272-1:2012EN 16272-1:2012 (E) 5 1 Scope This European Standard specifies the laboratory method for measuring the sound absorption of flat noise barriers or flat claddings for retaining walls or tunnels. It covers the assessment of the intrinsic sound absorption performance of noise barriers

35、 and related devices acting on airborne sound propagation designed for railways which can reasonably be assembled inside the testing facility described in EN ISO 354. The test method in EN ISO 354, referred to in this European Standard, is strictly valid only for flat absorbers and in particular exc

36、ludes devices which act as slightly damped resonators. Some devices will depart significantly from these requirements and in these cases care is needed in interpreting the results. All noise reducing devices that differ from noise barriers and related devices acting on airborne sound propagation, e.

37、g. devices for attenuation of ground borne vibration and on board devices are out of the scope of this European Standard. NOTE The test method in EN ISO 354 is based on measurements in a reverberation room where diffuse sound field conditions prevail. As a uniformly applicable method for the determi

38、nation of the sound absorptive performance of noise reducing devices under free field conditions is still under development, the measurement results according to this European Standard are temporarily considered relevant for application on noise reducing devices in reverberant as well as in free fie

39、ld conditions. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (incl

40、uding any amendments) applies. ENV 13005, Guide to the expression of uncertainty in measurement EN 16272-3-1, Railway applications Track Noise barriers and related devices acting on airborne sound propagation Test method for determining the acoustic performance Part 3-1: Normalised railway noise spe

41、ctrum and single number ratings for diffuse field applications EN ISO 354, Acoustics Measurement of sound absorption in a reverberation room (ISO 354) 3 Terms and definitions For the purpose of this document the following terms and definitions apply. 3.1 noise barrier noise reducing device, which ob

42、structs the direct transmission of airborne sound emanating from railways; it may either span or overhang the railway Note 1 to entry: Noise barriers are generally made of acoustic and structural elements (see 3.3 and 3.4). 3.2 cladding noise reducing device, which is attached to a wall or other str

43、ucture and reduces the amount of sound reflected Note 1 to entry: Claddings are generally made of acoustic and structural elements (see 3.3 and 3.4). 3.3 acoustic element element whose primary function is to provide the acoustic performance of the device BS EN 16272-1:2012EN 16272-1:2012 (E) 6 3.4 s

44、tructural element element whose primary function is to support or hold in place acoustic elements 4 Symbols and abbreviations For the purposes of this document, the following symbols and abbreviations apply. Table 1 Symbols and abbreviations Symbol or abbreviation Designation Unit SiSound absorption

45、 coefficient in the i-th one-third octave band according to EN ISO 354 - DLSingle number rating of sound absorption dB L Greatest distance between the side edge of the sample and the post included in the sample m 5 Test arrangement The test arrangement shall be as described in EN ISO 354, with the f

46、ollowing modifications: a) The test specimen shall be assembled in the test chamber in the same manner as the manufactured device is used in practice, with the same connections and seals between the component parts. b) All the reflecting parts exposed on the rail side of the material (posts, bracket

47、s and other parts) shall be present on the specimen as in practice. c) Where posts are employed in construction, at least one post shall be included in the specimen with panels attached on both sides. The length of the panels on one side of the post shall be L 2 m (see Figure 1 and Figure 2). The si

48、de that would face the rail shall face the inner part of the room (see Figure 1 and Figure 2). The post shall be sealed as in practice. d) The test specimen shall have a reflecting frame sealed against it on its entire perimeter (see Figure 1 to Figure 5). e) For testing noise barriers, the specimen

49、 shall be placed directly against one of the surfaces (floor, wall or ceiling) of the chamber without any gap (see Figure 1, Figure 2 and Figure 3). If needed, concrete, used as filler, shall be inserted between panels and chamber surface. f) If the sample under test includes non flat panels, leaving cavities between the panels and the chamber floor, these cavities should be completely filled with concrete (see Figure 3). g) If the sample under test includes