EN 1793-1-2017 en Road traffic noise reducing devices - Test method for determining the acoustic performance - Part 1 Intrinsic characteristics of sound absorption under diffuse so.pdf

1、BS EN 1793-1:2017Road traffic noise reducingdevices Test method fordetermining the acousticperformancePart 1: Intrinsic characteristics of soundabsorption under diffuse sound fieldconditionsBSI Standards PublicationWB11885_BSI_StandardCovs_2013_AW.indd 1 15/05/2013 15:06BS EN 1793-1:2017 BRITISH STA

2、NDARDNational forewordThis British Standard is the UK implementation of EN 1793-1:2017. It supersedes BS EN 1793-1:2012 which is withdrawn.The UK participation in its preparation was entrusted to Technical Committee B/509/6, Fences for the attenuation of noise.A list of organizations represented on

3、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 Institution 2017.Published by BSI Standards Limited 2017ISBN 978 0 580 89777 1

4、ICS 17.140.30; 93.080.30 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 April 2017.Amendments/corrigenda issued since publicationDate T e x t a f f e c t e d

5、BS EN 1793-1:2017EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 1793-1 March 2017 ICS 17.140.30; 93.080.30 Supersedes EN 1793-1:2012English Version Road traffic noise reducing devices - Test method for determining the acoustic performance - Part 1: Intrinsic characteristics of sound absorption

6、 under diffuse sound field conditions Dispositifs de rduction du bruit du trafic routier - Mthode dessai pour la dtermination de la performance acoustique - Partie 1 : Caractristique intrinsques de labsorption acoustique dans des conditions de champ acoustique diffus Lrmschutzvorrichtungen an Straen

7、 - Prfverfahren zur Bestimmung der akustischen Eigenschaften - Teil 1: Produktspezifische Merkmale der Schallabsorption in diffusen Schallfeldern This European Standard was approved by CEN on 6 February 2017. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate t

8、he 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 Standar

9、d 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 nation

10、al 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, Serbi

11、a, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2017 CEN All rights of exploitation in any form and by a

12、ny means reserved worldwide for CEN national Members. Ref. No. EN 1793-1:2017 EBS EN 1793-1:2017Contents PageEuropean foreword . 3 Introduction 5 1 Scope 7 2 Normative references 7 3 Symbols and abbreviations . 7 4 Test arrangement 8 5 Test procedure and evaluation . 13 5.1 Test method . 13 5.2 Sing

13、le number rating of sound absorption DL,NRD. 16 6 Test report 16 6.1 Expression of results . 16 6.2 Further information 17 Annex A (informative) Guidance note on the use of the single number rating DL,NRD18 Annex B (informative) Measurement uncertainty 19 B.1 General . 19 B.2 Measurement uncertainty

14、 based upon reproducibility data . 19 Annex C (informative) Example test report . 20 C.1 Overview . 20 C.2 Test object (example) . 21 C.3 Test situation (example) . 22 C.3.1 Test room and test arrangement 22 C.3.2 Test equipment and test procedures 23 C.3.3 Test conditions 24 C.4 Test results (examp

15、le) . 24 Bibliography . 26 EN 1793-1:2017 (E)BS EN 1793-1:2017European foreword This document (EN 1793-1:2017) has been prepared by Technical Committee CEN/TC 226 “Road equipment”, the secretariat of which is held by AFNOR. This European Standard shall be given the status of a national standard, eit

16、her by publication of an identical text or by endorsement, at the latest by September 2017, and conflicting national standards shall be withdrawn at the latest by September 2017. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN

17、 shall not be held responsible for identifying any or all such patent rights. This document supersedes EN 1793-1:2012. With respect to the superseded document, the following changes have been made: the description of the test arrangement has been improved; the method for determining sound absorption

18、 coefficients in each one-third octave band, as described in EN ISO 354, has been modified: the Sabine absorption coefficient Sihas been replaced by a new absorption coefficient NRD,ithat is specific to noise reducing devices and which takes account of the volume of the test sample (the new coeffici

19、ent NRD,imight be derived from Si); the contents of the test report have been better defined; the declaration of the measurement uncertainty and the related confidence level is now mandatory. The reported uncertainties have an impact on the determination of informative categories of single number ra

20、ting performance; depending on the performance of the product this could potentially result in products being downgraded to a lower category. As a result, the informative annex addressing categories of single number rating has been removed. The performance of the noise reducing device is, from now o

21、n, only to be reported in terms of the numeric values of the single number rating; a detailed example is presented (Annex C). EN 1793-1 is part of a series and should be read in conjunction with the following: EN 1793-2, Road traffic noise reducing devices Test method for determining the acoustic pe

22、rformance Part 2: Intrinsic characteristics of airborne sound insulation under diffuse sound field conditions; EN 1793-3, Road traffic noise reducing devices Test method for determining the acoustic performance Part 3: Normalized traffic noise spectrum; EN 1793-4, Road traffic noise reducing devices

23、 Test method for determining the acoustic performance Part 4: Intrinsic characteristics In situ values of sound diffraction; EN 1793-5, Road traffic noise reducing devices Test method for determining the acoustic performance Part 5: Intrinsic characteristics In situ values of sound reflection under

24、direct sound field conditions; EN 1793-1:2017 (E)BS EN 1793-1:2017 EN 1793-6, Road traffic noise reducing devices Test method for determining the acoustic performance Part 6: Intrinsic characteristics In situ values of airborne sound insulation under direct sound field conditions. According to the C

25、EN-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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hung

26、ary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. EN 1793-1:2017 (E)BS EN 1793-1:2017Introduction Where a sound reflecting surface is installed alo

27、ng a road, it may be effective to use sound absorbing devices on its traffic 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 sound waves toward unprotected are

28、as; vertical cuttings or reflective surfaces that face each other; tunnels and their approaches; traffic passing close to a barrier where reflections between the vehicles and the barrier may reduce effectiveness. This European Standard specifies a test method for qualifying the sound absorption perf

29、ormance of noise reducing devices designed for roads (a measure of intrinsic performance). It is not concerned with determining insertion loss (extrinsic performance) which depends on additional factors which are not related to the product itself, e.g. the dimensions of the barrier and quality of in

30、stallation work and site factors such as ground impedance, site geometry etc. The test is designed to allow the intrinsic sound absorption performance of the device to be measured under diffuse sound field conditions; the resulting rating should aid the selection of devices for particular roadside a

31、pplications. The measurement results of this method for sound absorption are not directly comparable with the results of the in situ method (EN 1793-5), mainly because the present method uses a diffuse sound field, while the in situ method assumes a directional sound field. The test method described

32、 in the present document should not be used to determine the intrinsic characteristics of sound absorption for noise reducing devices to be installed on roads under non-reverberant conditions. Research studies suggest that some correlation exists between laboratory data, measured according to EN 179

33、3-5 and laboratory data, measured according to the method described in this European Standard 1, 2, 3, 4. For the purpose of this European Standard, reverberant conditions are defined based on the envelope, e, across the road formed by the device under test, trench sides or buildings (the envelope d

34、oes not include the road 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, w, is less than or equal to 25 %, i.e. reverberant conditions occur when w/e 0,25, where e = (w + h1+ h2) or e = (w + h1) as per

35、Figure 1. This method may be used to qualify noise reducing devices for other applications, e.g. to be installed nearby industrial sites. In this case the single-number ratings should be calculated using an appropriate spectrum. EN 1793-1:2017 (E)BS EN 1793-1:2017a) Partial cover on both sides of th

36、e road; envelope, e = w+h1+h2b) Partial cover on one side of the road; envelope, e = w+h1c) Deep trench; envelope, e = w+h1+h2d) Tall barriers or buildings; envelope, e = w+h1+h2Key r road surface w width of open space NOTE Figure 1 is not to scale. Figure 1 Sketch of the reverberant condition check

37、 in four cases EN 1793-1:2017 (E)BS EN 1793-1:20171 Scope This European Standard specifies the laboratory method for measuring the sound absorption performance of road traffic noise reducing devices in reverberant conditions. It covers the assessment of the intrinsic sound absorption performance of

38、devices that can reasonably be assembled inside the testing facility described in EN ISO 354. This method is not intended for the determination of the intrinsic characteristics of sound absorption of noise reducing devices to be installed on roads in non-reverberant conditions. The test method in EN

39、 ISO 354 referred to in this European Standard excludes devices that act as weakly damped resonators. Some devices will depart significantly from these requirements and in these cases, care is needed in interpreting the results. 2 Normative references The following documents, in whole or in part, ar

40、e 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 (including any amendments) applies. EN 1793-3, Road traffic noise reducing devices - Test m

41、ethod for determining the acoustic performance - Part 3: Normalized traffic noise spectrum EN ISO 354:2003, Acoustics - Measurement of sound absorption in a reverberation room (ISO 354:2003) ISO 9613-1, Acoustics Attenuation of sound during propagation outdoors Part 1: Calculation of the absorption

42、of sound by the atmosphere 3 Symbols and abbreviations For the purposes of this document, the following symbols and abbreviations apply. Symbol or abbreviation Designation Unit NRDiSound absorption coefficient in the ithone-third octave band - A1Equivalent sound absorption area of the empty reverber

43、ation room m2A2Equivalent sound absorption area of the reverberation room containing a test specimen m2ATEquivalent sound absorption area of the test specimen m2c1Propagation speed of sound in air in the empty reverberation room ms1c2Propagation speed of sound in air in the reverberation room with t

44、he test specimen during the measurement ms1DL,NRDSingle-number rating of sound absorption performance expressed as a difference of A weighted sound pressure levels dB L Length of the test panels on one side of the post m LiNormalized A weighted sound pressure level of traffic noise in the ithone-thi

45、rd octave band defined in EN 17933 dB EN 1793-1:2017 (E)BS EN 1793-1:2017Symbol or abbreviation Designation Unit m1Power attenuation coefficient calculated according to ISO 9613-1 using the climatic conditions that have been present in the empty reverberation room during the measurement. The value o

46、f m can be calculated from the attenuation coefficient, , which is used in ISO 9613-1 m1m2Power attenuation coefficient calculated according to ISO 9613-1 using the climatic conditions that have been present in the reverberation room with the test specimen during the measurement. The value of m can

47、be calculated from the attenuation coefficient, , which is used in ISO 9613-1 m1S Area (of the floor of the reverberation room) covered by the test specimen m2T1Reverberation time of the empty reverberation room s T2Reverberation time of the reverberation room after the test specimen has been introd

48、uced s V1Net volume of the empty reverberation room m3V2Net volume of the reverberation room containing a test specimen m3VsNet volume of the test sample m34 Test arrangement The test arrangement shall be as described in EN ISO 354, with the following modifications. The test specimen shall be assemb

49、led 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. All the reflecting parts exposed on the road traffic side of the material (posts, brackets and other parts) shall be present on the specimen as in practice. 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 th