1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS EN 1793-2:2012Road traffic noise reducing devices Test method for determining the acoustic performancePart 2: Intrinsic characteristics of airborne sound insulation under diff
2、use sound field conditionsBS EN 1793-2:2012 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN 1793-2:2012. It supersedes BS EN 1793-2:1998 which is withdrawn.The UK participation in its preparation was entrusted to Technical Committee B/509/6, Fences for the atten
3、uation of noise.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 Institution 2012. Publis
4、hed by BSI Standards Limited 2012ISBN 978 0 580 71107 7 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 November 2012.Amendments issu
5、ed since publicationDate T e x t a f f e c t e dBS EN 1793-2:2012EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 1793-2 November 2012 ICS 17.140.30; 93.080.30 Supersedes EN 1793-2:1997English Version Road traffic noise reducing devices - Test method for determining the acoustic performance - Pa
6、rt 2: Intrinsic characteristics of airborne sound insulation under diffuse sound field conditions Dispositifs de rduction du bruit du trafic routier - Mthode dessai pour la dtermination de la performance acoustique - Partie 2: Caractristiques intrinsques de lisolation aux bruits ariens dans des cond
7、itions de champ acoustique diffus Lrmschutzvorrichtungen an Straen - Prfverfahren zur Bestimmung der akustischen Eigenschaften - Teil 2: Produktspezifische Merkmale der Luftschalldmmung unter den Bedingungen eines diffusen Schallfeldes This European Standard was approved by CEN on 29 September 2012.
8、 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
9、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-CENELE
10、C 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,
11、 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 EUROPISCHES KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17,
12、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 1793-2:2012: EBS EN 1793-2:2012EN 1793-2:2012 (E) 2 Contents Page Foreword 3Introduction . 41 Scope 62 Normative references 63 Symbols 64 Test arrangement . 65 Te
13、st procedure and evaluation 86 Measurement uncertainty . 87 Test report 8Annex A (normative) Categorisation of single-number rating .10Annex B (informative) Guidance note on use of the number rating DLR11Annex C (informative) Measurement uncertainty 12BS EN 1793-2:2012EN 1793-2:2012 (E) 3 Foreword T
14、his document (EN 1793-2:2012) 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, either by publication of an identical text or by endorsement, at the latest by May 2
15、013, and conflicting national standards shall be withdrawn at the latest by March 2014. 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
16、. This document supersedes EN 1793-2:1997. In the previous version of this European Standard, the scope covered the noise reducing devices wherever they can be used alongside roads. In the current version of this European Standard, as its adapted title states explicitly, the scope is restricted to n
17、oise reducing devices designed for use under diffuse field conditions, e.g. inside tunnels or deep trenches or under covers (an explanation is presented in the introduction). EN 1793-2 is part of a series and should be read in conjunction with the following: EN 1793-1, Road traffic noise reducing de
18、vices Test method for determining the acoustic performance Part 1: Intrinsic characteristics of sound absorption; EN 1793-3, Road traffic noise reducing devices Test method for determining the acoustic performance Part 3: Normalized traffic noise spectrum; CEN/TS 1793-4, Road traffic noise reducing
19、devices Test method for determining the acoustic performance Part 4: Intrinsic characteristics In situ values of sound diffraction; CEN/TS 1793-5, Road traffic noise reducing devices Test method for determining the acoustic performance Part 5: Intrinsic characteristics In situ values of sound reflec
20、tion and airborne sound insulation; 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 CEN/CENELEC Internal Regulations
21、, 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, Hungary, Iceland, Ireland, Italy, L
22、atvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. BS EN 1793-2:2012EN 1793-2:2012 (E) 4 Introduction Noise reducing devices alongside roads have to provide adequate sound insulation so t
23、hat sound transmitted through the device is not significant compared with the sound diffracted over the top. This European Standard specifies a test method for qualifying the intrinsic airborne sound insulation performance for noise reducing devices designed for roads in reverberant conditions, e.g.
24、 inside tunnels or deep trenches or under covers. The measurement results of this method for airborne sound insulation are comparable but not identical with the results of the test method EN 1793-6, mainly because the present method uses a diffuse sound field, while the other method assumes a direct
25、ional sound field. However, research studies suggest that a quite good correlation exists between the two methods. The test method described in this European Standard should not be used to determine the intrinsic characteristics of airborne sound insulation for noise reducing devices to be installed
26、 on roads in non-reverberant conditions. This European Standard is not concerned with determining insertion loss (extrinsic performance) which additionally depends on factors which are not related to the product itself; e.g. the dimensions of the barrier and quality of installation work and site fac
27、tors such as ground impedance, site geometry etc. The test is designed to allow the intrinsic airborne sound insulation performance of the device to be measured; the resulting rating should aid the selection of devices for reverberant roadside applications. This method may be used to qualify noise r
28、educing devices for applications in other reverberant conditions, e.g. found along railways or near industrial sites. In these cases the single-number ratings should be calculated using an appropriate spectrum. For the purpose of this European standard reverberant conditions are defined based on the
29、 geometric envelope, e, across the road formed by the barriers, trench sides or buildings (the envelope does 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 is less than or equal to
30、25 %, i.e. reverberant conditions occur when w/e 0,25, where e = (w+h1+h2). BS EN 1793-2:2012EN 1793-2:2012 (E) 5 Key Key h1: length of left barrier surface h1: length of partial cover surface envelope h2: length of right barrier surface e = w+h1envelope, e = w+h1+h2(a) Partial cover on both sides o
31、f the road (b) Partial cover on one side of the road Key Key h1: length of left trench side h1: length of left barrier/building h2: length of right trench side; envelope h2: length of right barrier/building envelope, e = w+h1+h2envelope, e = w+h1+h2(c) Deep trench (d) Tall barriers or buildings In a
32、ll cases r: road surface; w: width of open space. Figure 1 Sketch of the reverberant condition check in four cases (not to scale) BS EN 1793-2:2012EN 1793-2:2012 (E) 6 1 Scope This European Standard specifies the laboratory method for measuring the airborne sound insulation performance of road traff
33、ic noise reducing devices in reverberant conditions. It covers the assessment of the intrinsic performance of barriers that can reasonably be assembled inside the testing facility described in EN ISO 10140-2 and EN ISO 10140-4. This method is not intended for the determination of the intrinsic chara
34、cteristics of airborne sound insulation of noise reducing devices to be installed on roads in non-reverberant 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,
35、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 method for determining the acoustic performance Part 3: Normalized traffic noise spectrum EN ISO 10140-1, Acou
36、stics Laboratory measurement of sound insulation of building elements Part 1: Application rules for specific products (ISO 10140-1) EN ISO 10140-2, Acoustics Laboratory measurement of sound insulation of building elements Part 2: Measurement of airborne sound insulation (ISO 10140-2) EN ISO 10140-4,
37、 Acoustics Laboratory measurement of sound insulation of building elements Part 4: Measurement procedures and requirements (ISO 10140-4) 3 Symbols For the purposes of this document, the following symbols apply. RiSound reduction index in the ithone-third octave band LiNormalised A-weighted sound pre
38、ssure level, in decibels, of traffic noise in the ithone-third octave band defined in EN 1793-3 DLRSingle-number rating of airborne sound insulation performance expressed as a difference of A-weighted sound pressure levels, in decibels 4 Test arrangement The test arrangement shall be as described in
39、 EN ISO 10140-1, EN ISO 10140-2 and EN ISO 10140-4 for partitions with the following modifications: The test specimen shall be mounted in the test opening and assembled in the same manner as the manufactured device is used in practice with the same connections and seals between component parts. The
40、edge supports shall not overlap the sample by more than 70 mm and shall be sealed to prevent the leakage of sound. BS EN 1793-2:2012EN 1793-2:2012 (E) 7 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
41、 panels on one side of the post shall be 2 m (see Figure 1). The side that would face the traffic shall face the source room. The sample under test, excluding the plinth for levelling, shall have a windowed area not less than 9,5 m2. The sample surface area to be used in calculations shall be the to
42、tal surface area of the sample excluding the plinth for levelling and the overlap surface of the edge supports. Key 1 sealing materials 5 bricked up plinth for levelling (if necessary) 2 panels (sealed as in practice) 6 post (sealed as in practice) 3 post 7 sealing materials to prevent edge leakage
43、4 L 2 m Figure 2 Mounting conditions for test specimen BS EN 1793-2:2012EN 1793-2:2012 (E) 8 5 Test procedure and evaluation 5.1 Test method The sound reduction indices Riin each one-third octave band in the range 100 Hz to 5 kHz shall be determined using the method described in EN ISO 10140-2. 5.2
44、Single-number rating of airborne sound insulation DLRA single-number rating shall be derived to indicate the performance of the product. The individual sound reduction indices shall be weighted according to the normalised traffic noise spectrum defined in EN 1793-3. The single-number rating of airbo
45、rne sound insulation DLR, in decibels, is given by: DLRLRiLiiii=10 lg10 10100.1 0.11180.1118where DLRis the single-number rating of airborne sound insulation performance expressed as a difference of A-weighted sound pressure levels, in decibels; Riis the sound reduction index in the ithone-third oct
46、ave band; Liis the normalised A-weighted sound pressure level, in decibels, of traffic noise in the ithone-third octave band defined in EN 1793-3.NOTE Annex B provides guidance on the use of the single-number rating. 6 Measurement uncertainty The uncertainty of results obtained from measurements acc
47、ording to this European Standard shall be evaluated, preferably in compliance with ISO/IEC Guide 98-3. If reported, the expanded uncertainty together with the corresponding coverage factor for a stated coverage probability of 95 % as defined in ISO/EC Guide 98-3 shall be given. More information on m
48、easurement uncertainty is given in Annex C. 7 Test report 7.1 Expression of results The one-third octave band values of the sound reduction indices Rishall be given at all frequencies of measurement in tabular form and in the form of a graph. The indices shall be rounded to the nearest first decimal
49、 place. The single-number rating of airborne sound insulation DLRshall be reported after being rounded to the nearest integer. If the airborne sound insulation performance is to be categorised then this shall be in accordance with Annex A. 7.2 Further information The test report shall include the information listed below: BS EN 1793-2:2012EN 1793-2:2012 (E) 9 a) reference to this document; b) name and address of testing organisation; c) date of the test; d
